AlllDO TTESEM

A UNIIfcU UlAltS DEPARTMENT OF COMMERCE

PUBLICATION

BUILDING SCIENCE

Man and His Shelter^

Performance of Buildings

Concept and Measurement

U.S. DEPARTMENT OF COMMERCE

National Bureau of Standards



^^^>^^^^> Bur.,,, Of UNITED STATES DEPARTMENT OF COMMERCE • Maurice H. Stans, Secretary

, NATIONAL BUREAU OF STANDARDS • Lewis M. Branscomb, Director JAN ^

„ 6

^

iS77 ^

Performance of Buildings — Concept and Measurement ^^^^

Proceeding of the 1st Conference

in a Series of Conferences on

Man and His Shelter

Held at Gaithersburg, Maryland

September 23-25, 1968

Edited by

W. W. Walton and B. C. Cadoff

Building Research Division

Institute for Applied Technology

National Bureau of Standards

Washington, D.C. 20234

Building Science Series 1

Nat. Bur. Stand. (U.S.) BIdg. Sci. Ser. 1, 132 pages (January 1970) CODEN: BSSNB

Issued 1970

For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 (Order by SD Catalog No. C 13.29/2:1), Price $2.75
Abstract

The Conference entitled "Performance of Buildings — Concept and Measurement" was held at the National Bureau of Standards, Gaithersburg, Md. on September 23-25, 1968. This was the first in a planned series of conferences on "Man and His Shelter." The purpose of these conferences is to bring together

those people from various disciplines who may contribute to improving the quality

of man's shelter. At the present conference, papers were presented by nineteen

authors representing government and industry in such diverse disciplines as architecture, engineering, science, urban planning, and standards. These papers

emphasize the prime importance of considering user needs in the development

of performance criteria, the necessity of test methods to determine whether the

desired performance has been achieved, and the development of performance

specifications and standards. Application of these ideas to building systems, and

to the planning and design of entire communities, is also discussed.

Key words: Building systems; performance of buildings; standards; test methods; urban planning; user needs.

Library of Congress Catalog Card Number 70-600414
Foreword

Since as early as 1905, the National Bureau of Standards has developed test methods, standard practices, and data on the properties of materials used in the

construction industry. These data and test methods have been widely incorporated in building standards and codes in use today. If this country is to meet

its vast construction needs major changes in standards and codes must be made

to accommodate existing technological advances and encourage others

anticipated in the future. As with so many other technological problems facing us today, the most fruitful approaches to solutions will be interdisciplinary;

physical scientists, behavioral scientists, lawyers, mathematicians, architects,

engineers — all have a role to play. It is our intent that the National Bureau of

Standards shall in the future, as in the past, serve as an important focus of interest for those concerned with assuring the technical soundness of building standards

and codes.

It is in this context that the first of a planned series of conferences on "Man

and His Shelter" was held at the Gaithersburg laboratories of the National

Bureau of Standards in September 1968. This volume gives the proceedings of

that Conference.

Lewis M. Branscomb, Director
Preface

These are the proceedings of the Conference on the Performance of Buildings—Concept and Measurement, the first conference in the series. The conference was sponsored by the Building Research Division, Institute for Applied

Technology and was held at the National Bureau of Standards, Gaithersburg,

Md. in September 1968.

The meeting was attended by approximately 300 scientists, engineers, architects and other professionals in the building industry. The participants exchanged

ideas and discussed problems in an atmosphere that encouraged cooperation— so necessary in the fragmented building industry. (The questions and discussions

that followed the talks are not included in these proceedings.)

The "Performance Concept" includes a range of ideas from user needs to actual measurement of the performance of materials, components, and building

systems. The comments received since the conference, indicate that it was

successful in establishing a sharper picture of performance as applied to the

building industry.

The banquet provided the highlight of the conference when the Honorable

C. R. Smith, Secretary of the U.S. Department of Commerce, introduced the

Honorable Robert C. Weaver, Secretary of the U.S. Department of Housing

and Urban Development, who spoke eloquently on the problems of furnishing

decent shelter for our people.

The editors gratefully acknowledge the cooperation and assistance of the

NBS Office of Technical Information and Publications and the secretarial staff of the Building Research Division and the Institute for Applied Technology in conducting the conference and the publication of the proceedings.

W. W. Walton

B. C. Cadoff
Contents p^^^ Foreword iii Preface iv Session 1. Introductory, W. W. Walton, Chairman

Welcome to NBS

L. M. Kiishner 3 Man and His Shelter— A Dialogue Between Science and Technology

J. P. Eherhard 5 Measurement— Key to Performance

J. R. Wright 1

1

The User as the Basis for Architectural and Urban Design M. Brill 21 Session II. Evolution of Performance Systems Method, T. E. Ware, Chairman

The Performance Systems Method

R. W. Blake 29 European Systems for Evaluation and Approval of Innovations in Buildings

B. E. Foster 31 Modular Coordination: A Basis for Industrialization of the Building Process

R. W. Smith, Jr: 37

Session III. Some Aspects of Low-Cost Housing, J. O. Bryson, Chairman

Goals and Intergovernmental Cooperation in Low-Cost Housing

B. T. Craun 45 Design Aspects of a Low-Cost Housing System

A^. B. Mitchell 47 Performance Testing of a Low-Cost Housing System

£. O. Pfrang 49

Session IV. Performance Testing of Building Components, B. C. Cadoff, Chairman

Performance Testing— State of the Art W. R. Herron 61 Performance Testing of Sanitary Plumbing Fixtures

P. R. Achenbach 65 Performance Testing of Exterior Walls: Air, Moisture and Heat Transfer H. E. Robinson 75 Performance Testing of Exterior Walls: Structural Properties R. G. Mathey and T. W. Reichard 77 Performance Testing of Floor Coverings W. C. Wolfe and W. C. Cidlen 85

Session V. Banquet, L. Kushner, Chairman

Technology and the City: Closing the Gap

Hon. Robert C. Weaver 95

Session VI. Trends and Opportunities, J. P. Eberhard, Chairman

Planning and Engineering of a New City (Columbia, Md.)

C. D. Wright, Jr 101 The National In-Cities Experimental Low-Cost Housing Research and Development Project

P. D. Bush 103 The Role of the Performance Concept in Urban Systems

T. Collison 1 1 1 Conference Impressions and Comments

W.A.Allen 121

V

SESSION I. INTRODUCTORY

W. W. Walton, Chairman

WELCOME TO NBS

Lawrence M. Kushner, Director

Institute for Applied Technology

National Bureau ofStandards

It is my pleasure to welcome you to the National

Bureau of Standards. I bring you greetings from Dr.

Astin, our Director, and his wishes for a most suc- cessful meeting.

This session on the Performance of Buildings is the first of what we hope will be a series devoted to the broader subject of Man and his Shelter. Man

has always sought to improve his shelter by

gradually utilizing incremental improvements in technology. Today, however, with the tremendously rapid advances of modern technology and

the exponential growth of population, the slow

progress of the past is no longer acceptable. It can- not keep pace with the rapid changes of today's

needs.

Buildings or structures represent over half of the

existing tangible wealth of this country. Aside from

the long-term economic significance, the annual

building production is in the range of $100 billion,

with an effect in every village, town, and city in the

country. In addition to this economic significance,

the turbulent political and social forces, so evidently active, are clear indications that we can no longer be content with previous rates of

progress. We must attack the problem directly.

To provide shelter for man, at work, at home, and

at play, that is commensurate with our present

scientific and technical ability is a challenge that can be solved only by a full interdisciplinary attack. There must be a dialogue (and we hope this is the

beginning of such) among the professionals con- cerned with the building process. Engineers must

solve problems of structures, heating, cooling, air flow, and plumbing; chemists must create new

materials and determine the interaction of materials

with one another and their environment; psychologists must investigate the effect on man of space

and all of its shapes, light and all of its colors, and

sound and all of its characteristics; mathematicians

must adapt the computer to the needs of the building industry; economists must control costs,

sociologists must assure that we are constructing a community, not just a building, and, of course,

architects must blend all these approaches together

to create a shelter for man which will truly satisfy

his needs.

The purpose of these conferences will be to bring

together all these people to talk, to exchange ideas

and knowledge, and to inspire each other to work

together productively. Because we are faced with a need for such rapid change, there will be no op- portunity for feedback from years of experience

with new innovations — no time to contemplate.

This imposes a greater need for research than ever

before; we must create a broad base of knowledge,

upon which we can draw for the solution of

problems.

The National Bureau of Standards has long had

an active interest in building research and technology. This interest stems directly from the

responsibilities of the Bureau for leadership in the

Nation's measurement activities. As early as 1905,

the Bureau had a 100-thousand-pound testing

machine which was busy measuring the strength

of various structural materials, such as steel, and

concrete, and so forth. Later on, the Bureau undertook a program with the National Fire Protection

Association and the Underwriters' Laboratory,

from which there flowed a considerable amount of

data on the fire resistance of materials; these data were subsequently incorporated in fire and electrical codes throughout the country. During the

I920's, under the administration of then Secretary

of Commerce, Herbert Hoover, we were concerned

with a Better Homes Program. During the

Depression of the 1930's, our attention was

directed toward low-cost housing; during World

War n, to the conservation of scarce building

materials. After the War, for fifteen years or so. there was a return to programs which stressed

the properties of the various kinds of building

materials. But today, the Bureau's interest in building technology is a very broad one. We are concerned, not only with problems related to materials,

but rather with the function and performance of

buildings as they satisfy the user. There are two aspects to the performance of

buildings. The first concerns the needs of the

3
4 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

user— is the temperature too high, too low, too vari- able; are there noises in the building that affect his productivity or comfort; is the light too glary or too gloomy; does the floor plan expedite his work or is

it consistent with the family pattern of living; is the

floor too hard or too soft. The second performance

aspect deals with buildings' physical functioning—how safe is the building; how well does the

thermostat control the temperature of the space;

how loud are the noises in the building and how are they transmitted; how efficient is the lighting

system and how much heat does it generate; how

much energy is required to walk or push a cart over

a soft floor; do the walls leak air, water, or heat;

what is the life expectancy of the paint on the wall. These two aspects are closely interrelated, but the

methods of measurement are dissimilar.

The primary concern of this conference will be

with the second aspect. The problems relating to the measurement of performance of buildings will be discussed and solutions presented. We hope that the free exchange of ideas at this conference will help to eliminate much of the confusion surrounding

the term, "performance concept."
MAN AND HIS SHELTER- A DIALOGUE BETWEEN SCIENCE AND TECHNOLOGY

J. P. Eberhard

School ofArchitecture

State University of New York

Buffalo, New York 14214

I welcome an opportunity to be back here. I ap- preciate the good efforts of Dr. Wright, Dr. Walton,

and Dr. Kushner in seeing that I could get back. I think and I hope it proves that old bureaucrats don't

die, don't fade away, but just come back in orbit once in a while to the place where they once shone.

I want to talk about two things with you in this keynote address: The first is why these conferences

are important to you, to the National Bureau of

Standards, and to the nation. The second is the

challenge that I believe is posed to all of us who are concerned with performance standards by the concept: Man and his Shelter. The conference actually began with a research

contract we gave to Mr. Allen, who, appropriately

will be the closing speaker in this conference. In his report he explored on our behalf the kinds of things

we ought to be doing in the future in the Building

Research Division in the Institute for Applied

Technology to make it more relevant to the coming

changes in the building industry.

One of his recommendations was that there

needed to be more conscious and direct liaison with

the building industries, and particularly with those

professionals who, in a sense, were on the front

lines of the building industry, making the day to day

decisions. It was from this advice that, through a series of recommendations, we organized a new sec- tion in the Building Research Division, for which

Dr. Walton is responsible. And, this is the first con- ference that grew out of these recommendations.

The quote that I would like to read to you first has to do with why I feel it is important that we

form this link between the National Bureau of Stan- dards and people who are active in the building in- dustries. It is a quotation from one of my favorite

books, Alexis de Tocqueville's Democracy in America. He tells at one point in his book, about a problem that he observed as a result of America's

deep involvement with practical affairs. He says,

"When the Europeans first arrived in China,

three hundred years ago, they found that almost all the arts had reached a certain degree

of perfection there, and they were surprised

that a people which had attained this point

should not have gone beyond it. At a later point, they discovered traces of some higher

branches of science that had been lost. The

nation was absorbed in productive industry,

the greater part of its scientific processes had

been preserved, but science itself no longer

existed there. This served to explain the strange

immobility in which they found the minds of

this people. The Chinese, in following the track

of their forefathers, had forgotten the reasons by which the latter had been guided. They still used the formula without asking for its meaning.

They retained the instrument, but they no

longer possessed the art of altering or renewing

it. The Chinese, then, had lost the power of

change. For them, improvement was impossible. They were compelled at all points to imitate their predecessors, lest they should

stray into utter darkness by deviating for an

instant from the path already laid down for them. The source of human knowledge was all but dry, and, though the stream still ran on, it could neither swell its waters, nor alter its course."

It seems to me in many ways that the building in- dustries in the United States face this problem that existed in China four hundred fifty years ago. We

differ in one major respect, or course, and that is that exploration of science has not stopped. My

concern is that the science that is being explored is essentially irrelevant to our purposes, that the

scientific effort that's going on in this nation, that goes on within the building industries is not well re- lated to man and his shelter; is not well related to those main problems in our society which we will have to solve and which will require the redirection

of our efforts. It seems to me that those who make

the day to day decisions — that's who I'm speaking

of principally here — from the front lines of the

building industries have by and large a strange immobility of mind, and that by following in the track

of their forefathers, they tend to use the formula

5
6 PERFORMANCE OF BUILDINGS

CONCEPT AND MEASUREMENT

without asking for its meaning, and consequently,

tend to no longer possess the art of altering or renewing it. The National Bureau of Standards, which I discovered only five years ago, when I came to Washington, and which I hope many of you will discover for the first time today if you're not aware

of it, is a real fountain of knowledge with respect to the scientific bases of decisions made in the building

industry. But I think it is bubbling just beneath the

surface of consciousness in the United States. For more than sixty years, as Dr. Kushner told you a few moments ago. amazing progress has been made

here in advancing the concepts and techniques of

physical measurement.

Let me tell you a little bit about physical mea- surement and the kinds of things that are going on

here and have gone on here for sixty years, on the

presumption that this will be educational to you. I think it will also be illustrative of something else I want to say in a few minutes. Do you know, for in- stance, that all physical measurement is based on

six fundamental measurement concepts: length, mass, time, temperature, ampere — the measure- ment of the flow of electricity, and what is now

known as candela — the measurement of the flow of

light? From these six fundamental phenomena, all other physical measurement are derived.

I want to talk about one of those concepts. I want

to talk about the concept of length and to give you some idea of why there are still more than three

thousand people employed in a National Bureau of

Standards that's responsible for fundamental measurement. Fm indebted for this story — sort of

second-hand — to Dr. Alvin McNish. If I were to put five dots on the blackboard and ask the

question: "How far apart are these dots?," 1 have

asked about the concept that has to do with length. In about 1901, when the National Bureau of Stan- dards was first formed, the sophistication required

to answer that question was not unlike having to simply agree, you and I, about what we meant by a

unit of length. We could have elected in 1901, by

the way, to pick up the Metric System, and we

wouldn't have some of the problems we have today;

but we didn't. We decided to use things that we borrowed from our Fnglish friends called yards and

feet and inches, and what we needed then in order

to answer the question, was an agreement that, if we

had a straight edge, and we divided it into sections

and subdivided those sections into subsections, that we could agree that this was a unit of length. And,

therefore, we could say that these dots were ap- proximately four inches apart. Well, that would

serve us fine, let's say, until about World War I, when someone would say we would have to be more accurate because our instruments have

become more sophisticated, our needs for fit are more precise. Just telling me, "Four inches" isn't precise enough. So, what we do is develop a much

more finely calibrated instrument for measurement,

and we'll find that the result is 0.32967 foot, or

within a few decimal places of being four inches.

This would work for a decade or so, when someone

would say, "You know, let's be more definite now,

about our measurement of how far it is between

these dots. And, if I look at one of these dots under

a microscope, I discover that its edge has many undulations. Now, when you say how far is it between

those dots, what do you mean— from this point or

this point or that point? Be more definite, my

friend." Well, it's obvious that we're going to have

to adopt again some arbitrary decision about what we are going to mean by "edge." And, the most logical would probably be that we would decide that we would use the mean arithmetical average of

those undulations of the edge of the dot as per- ceived under a ten power microscope.

One of the things that happens in this shift is that we are now, no longer measuring the actual

phenomena which we witness, but what we are measuring is something we've agreed on as a convention; namely, the arithmetical average from this point to the next point. And, we can, with instru- ments that become more accurate, express that distance more accurately. That will serve us for a number of years, and then, let's say, roughly about

the time of World War II, someone will say again, "Let's be more definite, because, if I look at this dot on this blackboard under a powerful microscope,

what I see is, not chalk and blackboard, what I see

is molecules. And, those molecules no longer possess the property of color; therefore, I don't have

white and black as contrast. Also, I have a much

more differentiated surface than what I saw at only

ten magnifications. And so, what I'm saying now is, how far is it from one molecule in this dot to the

molecule in the next dot? And, if what I want to do

is measure that in some way, I'm not going to be

able to do it with a straight-edge ruler, because, if I look at that, I'll see molecules there also." So, now,

what we may need to adopt is a convention that has

to do with the spectrum of light. And, we would say

that there are so many wave lengths of light
MAN AND HIS SHELTER- A DIALOGUE BETWEEN SCIENCE AND TECHNOLOGY 7

between a molecule at this position and a molecule

in that position.

That would serve us, roughly until the time of

Sputnik, when someone else would say, "Just a moment, let's be more definite again by what we mean,

because, if we look at this dot, now under an even more powerful microscope, what we see is, not molecules, but electrons, protons, and neutrons,

and, in fact, they are in motion." We now have

another shift in our concept. Length now depends,

not only on the concept of linearity; we have to in- troduce the concept of time, since electrons are not

in a fixed position. Their positions are only capable

of being predicted by the laws of probability. We're

going to bring time into our definition and indicate

how far apart an electron in this position is from an

electron in that position at what point in time.

Well, to some of you — to some of us, before I came here — that may sound like sort of crossing the

t's and dotting the i's ad infinitum. But, it's relatively clear that that kind of accuracy and precision in physical measurement has been necessary for the

kinds of technological stunts in which we've been

involved. For instance, at the time that Sputnik was

put up, our ability to measure time accurately was

such that the closest we could have expected to come with a moon shot, if we had been capable of

launching it at the time, was ten thousand miles.

When we compare that to the moon orbit that the

Russians accomplished within the last few days,

it's clear that that kind of achievement would not have been possible without a vast increase in the

accuracy as to what it was we meant by time,

and length in order to calculate those kinds of

trajectories.

So, I think it's important that you know what's

going on here, generally, but it's particularly useful

that you should know what's going on here in the

Building Research Division. While all of this work

is not as fundamental as the work on length that I talked about, it is fundamental in the sense that it underlies the measurement phenomena which most

of you deal with every day and which in dealing

with every day, you've come to accept as a convention. Even though its original base was arbitrary, we

no longer question the arbitrariness of the original

decision that was made about how we were going to make these measurements. It's clear that in some

areas, we're hung up on the arbitrariness. The easi- est one, of course, is "two by fours, sixteen inches on center." Hardly anyone wants to stick to that old paradigm anymore — including the people who

are in the business of producing and distributing

lumber. No one seems to know exactly how we

ever got sixteen inches on center into our technology. I've heard interesting stories from Ezra

Ehrenkrantz about its being the distance that was

arrived at, because cheap lath was needed in England about two centuries ago. Firewood had

been cut sixteen inches long, because the back of

fireplaces were two bricks wide, and two standard

nine inch bricks made fireplaces eighteen inches

wide. Everybody had an eighteen-inch-wide

fireplace, so that the kindling wood manufacturers

made the wood sixteen inches long to fit into the

fireplaces. Kindling wood was a cheap source of

lumber, so they chopped it up into lathing, and then

they had to put the upright sixteen inches on center. For that, we're now bound into modular concepts

ad infinitum, multiples of sixteen inches. There's

nothing very sacred about sixteen inches I could

pick out ten meters, or centimeters, or any other

unit, and if everybody in this room, and all their companies, and all the industries in the United

States that made building products wanted to ac- cept it, we could use that. The problem is getting a convention that is rational. And, that's the other reason I think that you

should be here. You should know what's going on

here, but, just as important, the people who are working here need to know what's going on out where you are — and, particularly again, those of

you who represent what Eve called now the front

line, the professionals who are making the

day-to-day building decisions. When I first came

here the Building Research Division was involved

in some work which was of questionable relevancy

with respect to the urgent needs of the building in- dustries and the clients of the building industries.

Let me cite three examples:

I. Mr. Robinson is responsible for a section in which fundamental work is going on in the

measurement of heat transfer properties of

materials. He has a very bright man working

there, and that young man recently worked

for a year on the heat transfer properties of

soils at temperatures up to two thousand

degrees Kelvin. We don't run into that problem very often in the building industry. In this case, the Space Program did, and

that's where the money came from. One

spin-off was that the method developed for

this work is directly applicable at the lower

temperatures of interest to the building in-
8 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

dustry, as in problems related to fires.

2. There was another man working on the hydration rate of cement. This work was related to the basic mission of the Bureau on materials

measurement methodology and chara- teriza- tion of materials. It should not have been

continued in the Institute for Applied

Technology. There are more urgent needs in building research, so the project was ter- minated.

3. And then, there's a project that is being

published now, and therefore, will soon be

coming to an end, on the presence of trace elements in concrete. It's the dominance of

the building materials properties which the

Building Research Division had not been

able to shake, and which most of you don't

want to shake — that is, most of you in this audience. I think one of the reasons why this audience consists of so many people in the

building materials business is because of this affinity between the nature of the scientific work that's been going on here on the properties of materials and the materials production

people in the building industry.

Any program that's rooted as this program is in basic physical science seems to me to need to reach

out its branches and twigs into the fresh air and the

sunshine of a changing world. And, that's what I had hoped and still hope these conferences can help

to do. The concept of standards, as a means of measuring the performance of an object or a system, has

historically lagged the scientific and technological

developments of this society. Until the measure- ment need becomes publicly visible, and until in- stitutional means are developed for arriving at ac- ceptable standards, there can be no nationally

recognized set of statements that can be used for standards.

You heard Dr. Kushner say before that, early in this country's history, the need to develop uniform

weights and measures helped to create an Office of

Weights and Measures, which was established in the Treasury as early as 1830. This organization,

later known as the National Bureau of Standards,

has continued to function as an institution, with primary responsibility for measurement based on the

phenomena recognized by the physical sciences.

We are now moving into a period in our national

development — accompanied by fleeting insights

into the social sciences — when we need to develop new concepts of standardization measurement

based on man as the user of objects and systems, as well as man as the observer of the properties of

such things.

The measurement system that I talked about be- fore—and its need for accuracy and precision — had

to do with man as the observer, man observing a phenomenon called length. We now begin to see through a glass darkly, that the artifacts which a society produces, from guns to cities, do have an impact on man, physiologically, psychologically,

and sociologically, and that, in fact, these impacts

are both positive and negative. But, our ignorance

is enormous. We have little idea of how to measure

whether or not one city is better than another, or whether new transportation systems will add to the

quality of our lives. The need is now publicly visi- ble. The next question is what form the institutions

might take to generate the needed standards.

This brings me to the second part of my talk. I want to talk now about the phenomena in which

such institutional mechanisms would be involved if we're going to bring man from a point of perspective

in which he is the observer of things that are happening in the physical world to where he, himself,

is engaged, either as man in relationship to objects,

like buildings, or man with relationships to other

men in the society. And, the quotation with which

I'd like to begin this secUon is from Louis Mumford's book. Techniques and Civilization. First I want to read what I consider to be a very interesting

biographical note in this Introduction. He's talking

about where he gained his experience and

background. He says:

"A few years later, I served as a laboratory helper

in the cement testing laboratory of the U.S.

Bureau of Standards, then at Pittsburgh, and was immersed in that classic paleotechnic

environment."

Probably Louis Mumford would still be a Bureau employee if this conference had been held

earlier! The quotation from his book is: "The physical sciences, when they began to emerge, rested fundamentally upon a few

simple principles: First, the elimination of

quality and the reduction of the complex to the simple, by paying attention only to those

aspects of events which could be weighed,

measured, or counted, and under the particular

kind of space-time sequence that could be

controlled and repeated, or, as in astronomy.
MAN AND HIS SHELTER— A DIALOGUE BETWEEN SCIENCE AND TECHNOLOGY 9

whose repetitions could be predicted. Second,

concentration upon the outer world and the

elimination or neutralization of the observer,

as respects the data with which he works.

Third, isolation, limitation of the field, specialization of interests and subdivision of labor. In short, what the physical sciences call the

world is not the total object of common human

experience; it is just those aspects of this experience that lend themselves to accurate,

factual observation, and to generalized state- ments. So that, for example; an ounce of pure

water in the laboratory is supposed to have

the same properties as a hundred cubic feet of equally pure water in a cistern, and the

environment of the object is not supposed to

affect its behavior."

We can measure quite precisely, if not always

very accurately, phenomena that have to do with

the heat transfer properties of building materials.

We can measure their structural strength. We can measure whether or not heating and air conditioning

equipment is producing the desired number of

B.T.U.'s. We can measure whether or not a light

fixture is producing enough candela to meet the

standard that we decided we wanted for illumination. We can measure whether or not the moisture

penetration of particular materials meets our stan- dards and requirements. But, these measurements

are based on the kind of phenomenology that I talked about before. They all began as arbitrary

decisions, but these arbitrary decisions have been

reinforced by practice and by convention and by

usage, and it has been possible for any man to reproduce them, as long as he understood the

science which underlay the principles that were in- volved in these measurements.

But, ladies and gentlemen, that's not where our problems lie. The Negro child in Arlington, or my

children in a forty-year-old school, who are going

to be very cold this winter, when the heating system

doesn't work and the windows leak; the young couple who've just been married and built a new home,

and find that their floors heave because they

haven't been properly laid down; the city that can't get a building built because the building inspector

and the trade unions won't permit that kind of construction to occur. Their problems are of two kinds

j and both are people problems — (1) the relationship

of man to man and (2) how man organizes his systems and his politics. That's something which

concerns us in this room but lies outside our perspective. They involve man and the objects which

he makes. They involve man and the things of his

life. They involve the shelter that he creates, in order that he can do the things that he does when he

lives that private part of his life in a place we call a home, or when he worships, or when he works, or when he goes to a conference like this. And, we

don't understand very well how man relates to these

kinds of objects in our society. What we have as a body of wisdom, is really a tradition that's been

passed on from generation to generation by people

like architects and engineers, that's essentially

based on intuition. It's not very systematic; it's not very rigorous; it's not very possible for one generation to benefit from the mistakes of the previous

generation. I'd like to cite a very simple example of

this: Feedback does not occur, because, if it did occur, after five thousand years of building buildings,

you would think we could build buildings that didn't

leak. If the Space Program had anywhere near the

kind of technological, scientific deficiency feedback

that we have in our industry, it obviously wouldn't

be where it is to day. Do you remember, about a year and a half ago, when one of the blast-offs was

stopped at some point like, "seventy minus zero and counting" (just the fact that almost all of us know those words is some indication of how

phenomenally they've been able to take over our

culture). When it stopped at that point, there was a problem. If you can conceive of the hundreds of

millions of possible problems a huge rocket like that could have at that point in time, and to realize that within a few hours, they were able to pinpoint that

it was a small capsule, about the size of the end of

my finger, which was not in the orifice when it was

supposed to be, you realize how well-organized,

how systematic, how rigorous the feedback

methodology is of controlling those huge birds. There isn't any reason — there isn't any technological reason — why we have to have a mess in our

shelter industry. It's a question of our aspirations;

it's a question of our wanting to be involved; it's a question of where we place our bets. And, I'd like to believe — because I'm an optimist I guess, and

one of the reasons I'm going to go try to organize a school for young people is that I'm an op- timist—that we're ready, we're really ready in this country, at this point in history, to do something

concrete and definite and systematic about improving the methodological processes, the technological

basis for the kinds of achievements that we could

produce in this country by the end of this century.
10 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

I think we're going to do it, almost in spite of who's

elected President in January. And, when we do that,

when we get ready, we're going to have to make a commitment, you and I and the National Bureau of

Standards, and particularly those young people who

are coming along behind us, who are now just

beginning to enter their professional careers in places like universities. And, that commitment is going to have to be one to dare, to dare to break

with the paradigms of the past, to dare to be

prepared to make the kinds of huge investments

that are going to be necessary to provide the body

of knowledge which for sixty years we have

neglected to develop in this country.

Do you realize that those inventions on which the

major structures in our urban environment depend,

namely, the elevator (which made it possible to go more than three floors up or five floors up if you

cared to walk that far), refrigeration (which made it possible to store food sixty floors up in the air in- stead of having to go to the shop every day), electricity, plumbing (which eliminated the need to be

attached to the ground for the outhouse), the au- tomobile, the subway — were all invented in the

twelve years between 1880 and 1892 — seventy

years ago! Do you know where we would turn in

this society for new ideas?

The American Institute of Architects, the American Society of Civil Engineers, the American

Society of Mechanical Engineers, the National Fire

Prevention Association, the American Society of

Testing and Materials — you name the professional

organizations; they were formed ten years either

side of the twelve year period of invention. What

about our universities, where the young people are coming from? Every engineering school of any size

and every architectural school, except for the few

that have just been started, like mine, was founded

five or ten years either side of those years of invention. I don't think it's an accident at all that we've

perpetuated those inventions. We're hooked on

plumbing; we're hooked on electric lights and steel skyscrapers and elevators because we have all the

institutional paraphernalia, the building codes, the

professional societies, the text books, the college

courses to reinforce those inventions. We're going

to break with those techniques soon and, when we

do, what are you going to do? Are you prepared to adapt to that new world? That's why I say it's a commitment for all of us; it's not going to be an easy

adaptation. We're not going to be able to parcel out

a few paltry million dollars from our Federal Treasury for research and assume we're going to change

the world. We're not going to be able to start an

architectural school in Buffalo that produces a new

generation of architects and assume we're going to change the world. We're not going to get a major

corporation to decide they're going to go into the

city-building business and change the world. We're

going to have to make vast investments in intellec- tual efforts and in research efforts, and it's not going

to be easy, it's not going to be smooth, and it's not going to be comfortable. But, I think it's imperative.

I think it's imperative that you be here, close to the

National Bureau of Standards, so that you can draw

on these well-springs of knowledge that are not very

well known generally in the building industry, and

so that they can draw on your well-springs of un- derstanding, the kinds of problems that you face

from day to day, the new aspirations that you have

for the directions that you're going, so they can make their programs relevant to your purposes.

Fd like to close with another quotation from Mr.

Mumford which, I think, underscores what Fm try- ing to say. He says:

"No society can escape the fact of change or evade the duty of selective accumulation.

Unfortunately, change and accumulation

work in both directions. Energies may be dis- sipated; institutions may decay; and society

may pile up evils and burdens, as well as goods and benefits. To assume that a later point of development necessarily brings a higher kind of society, is merely to confuse

the neutral quality of complexity or maturity

with improvement. To assume that a later point in time necessarily carries a greater

accumulation of values is to forget the recurrent facts of barbarism and degradation."

Fet's don't let that happen.
MEASUREMENT -KEY TO PERFORMANCE

James R. Wright

Chief, Building Research Division

Institute for Applied Technology

National Bureau ofStandards

Introduction

This paper, in effect, could be viewed as the

counterpart to the final event on the conference

program, which is Mr. William Allen's Summary

i and Discussion. I say this because it is my aim to provide you with background material that is ger-

' mane to every talk involving the performance concept, whether it be theoretical or experimental, a laboratory or field application, a talk given in this conference or any other that deals with performance. This statement can be made with a high degree

of confidence, since implementation of the perj formance concept cannot move beyond narrative

' expression without evaluative techniques; namely,

measurement.

My presentation will cover three closely related

topics:

1. The National Measurement System,

2. The Performance Concept, and

3. Evaluative Techniques for Both Subjective

and Objective Measurement.

I do not plan to tie these separate topics together

tightly— that would require too much time and the use of examples that subsequent speakers will provide. Sufficient examples of measurement will be

provided, however, to clarify or illustrate key concepts and definitions.

The National Measurement System

j Measurement is not only the key to implementaj tion of the performance concept in building, it is, in

j our present-day, technologically-based society, the

key to our daily living. When we glance at the clock,

j buy a pound of butter, check the car mileage, or

listen to radio reports on the temperature of the

j weather, we resort to an obviously simple use of the

I four basic measurement quantities; time, mass,

I length, and temperature. Not as easily recognized

j is the relationship of these four quantities to the

I thousands of items which are mass produced for the

j marketplace. Nor is it commonly realized that the

myriad technological wonders of the day are all possible only because there is a complex system of

measurements based on these four quantities. In our post-industrial world, where technology is ever more complicated, we need more and more ac- curate measurements, and we need them for products, devices, processes and systems which, to be handled adequately, require more advanced

techniques and test methodologies than are now

available. This is not to downgrade the existing

complex measurement system which has evolved

with the growth and industrialization of our

country. In fact, it is only recently that the concept

of a National Measurement System (NMS) has

been given formal recognition through the efforts of Dr. Robert D. Huntoon of the National Bureau of

Standards [1]. The System has as its main function

to provide the basis in the USA for a complete, consistent system for physical measurement.

The NMS is one of a number of important social

systems that form the environment in which we

function. Others more widely recognized include

communication, transportation, education, medical,

and legal, to name but a few. The size and scope of

the National Measurement System is tremendous.

By Huntoon's estimates, there are roughly 20 bil- lion measurements made each day. Based on 1965

data, industries that account for two-thirds of the

gross national product annually invest about $14

billion of operating expenditures and 1.3 million

man-years in measurement activities. The nation

has about $25 billion invested in instruments for measuring, and this investment is increasing at a

rate of $4.5 billion per year. Another $20 billion is invested in completed data on properties of matter and materials, and this is being increased at an an- nual rate of $3 billion. More than 90% of the cost of

this total measurement effort is paid for through

charges to the user in the market; the Federal

Government, as a consumer, bears its share of the

cost. But over and above this, the Government contributes to the system by providing a central facility,

the National Bureau of Standards, as a resource for

332-247 0 - 69 -2
12 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

developing the measurement techniques and stan- dards required for the maintenance or development

of the system.

The NMS is built on the principle that "things

equal to the same thing are equal to each other."

The system is an hierarchical arrangement, whose

compatibility is achieved by comparisons at in- creasing levels of accuracy until, for any measure- ment quantity, all measurements are referred to a common tie point or standard. The entire structure

is anchored on the four basic quantities; mass,

length, time, and temperature. By linking the units

for all other physical quantities to the units of the

four basic quantities, the system is made coherent

through the definitions and equations of physics.

Looking at it in another way, the primary and

derived physical quantities form a set of about 50

measurement quantities which is the core of the

System, and from which all other physical measure- ments of science, industry, and commerce are developed. Derived measurements are, for example, pressure, humidity, acceleration, and volume.

Turning outward from the basic core, we find

another set of measurements developed in response

to the national need for a readily accessible body of

reliable and consistent data on the properties of

materials. This part of the system includes evaluated data compilations, reference materials, such as pure chemical samples, critical reviews of quantitative knowledge for specialized areas, computations

of useful functions derived from standard reference

data, etc. Such information can be used over and

over and reduces the duplication of measurements

required in the daily operation of our society.

Moving even further from the basic measure- ments core, we come to the area of technological or

so-called "engineering" measurements and standards. These include product or commodity standards, standards of practice, and standard test methods. It is this part of the NMS which contributes most to the building and construction

industries.

It should be clearly recognized that technological

measurements and standards are at the interface

between science and its application to the needs of our society. They are an extension of good measurement, so well defined in the sciences, into the

engineering fields and complexes of today's society. In contrast to the relatively few standards in the

basic quantities core (four) and derived physical

quantities level of the NMS hierarchy (fifty), there

are in excess of 13,000 nationally recognized

technological standards, and these are predicated

upon a user/producer consensus as to what are the

important characteristics of the products,

processes, or services concerned. Despite the

apparent lack of a logical base tying these standards

together, the expression of user needs and the

description of products, processes or services

offered to meet these needs, are measurement

functions. As part of the NMS hierarchical struc- ture they are linked through the process of the

system to the basic measurement quantities,

and thence to the logic of physics.

This, then, is a brief description of the conceptual

structure of the National Measurement System —

a

skeletal framework of basic measurement quantities

tied together by the laws of physics — a large body

of measurement data which describes our physical

world — and a constantly changing multitude of

technological measurements and standards which

bring order and quantificafion to man's utilizaUon

of his technical skills. What has been omitted in this brief description is the operation of the substructures within the system; the instrument, the data,

and the techniques networks which Huntoon

elaborated in the work already cited [1]. The National Measurement System concept by

spelling out the relationships among the many and

varied kinds of measurements carried on

throughout the country, opens the way to improved

efficiency of the total measurement effort. It lends

help in defining what our measurement problems

are. And in their solution, it offers a rationale for the

choice of the most appropriate methods or

techniques. Huntoon has noted that there is a

definite trend toward "self-calibration." He pre- dicts that increasingly industrial laboratories will carry out their own calibrations with materials,

data, or transportable standards supplied by the National Bureau of Standards serving as the country's

central measurement laboratory. The national

development of such practices is only possible if they are generated in the context of the System's

relationships. In examining the NMS hierarchy it is quickly

evident that the technological measurements and

standards-level directly impinges upon our economic growth. Society has accepted the use of

technical standards or specifications that embody

user consensus of which factors are important and

what quantitative levels must be achieved for these

factors if a product is to be acceptable in the market. Standards based on evaluation of design
MEASUREMENT— KEY TO PERFORMANCE 13

characteristics are essential for uniformity of

products, intercFiangeability of parts, and massproduction techniques. However, such design stan- dards are sometimes inappropriate for complex

item evaluations. As the technical sophistication of

articles of commerce increases, it becomes more

and more difficult to define those characteristics

which best describe or measure the performance of

such items.

Standards which too rigidly specify how a product shall meet a user's need can inhibit economic growth by closing the way to the development and introduction of new products or services.

If standards are to stimulate innovation, they must

not rigidly specify the end product design, but

rather stress the performance expected in answer

to the needs of the user. Thus will producers be en- couraged to seek answers which will meet the per- formance required by any means which will do the

job. The use of performance requirements as the

basis for standards development introduces man

into the measurement process; it provides a cross- walk from the subjective consensus technique for determining what acceptability factors are important to an objective test methodology for measuring

these factors.

The Performance Concept

Recently a great many terms have come to be

used in discussion of the performance approach to buildings and to the process of building. To stabilize the situation somewhat, we have in the Institute for Applied Technology developed a definition for the

performance concept and a set of five terms leading

from a performance requirement, based on user needs, to a performance-type building code. The

next part of my talk will deal with our concept of

performance, the definition of terms employed, and

examples that illustrate the use of these terms. My

examples will be limited in number and very ele- mentary, but the talks you will hear later from In- stitute for Applied Technology personnel will pro- vide suitable examples in much more detail, all re- lated to some aspect of building.

The performance concept provides a framework

within which it is possible to state the desired at- tributes of a material, component or system in order

to fulfill the requirements of the intended user without regard to the specific means to be employed

in achieving the results [2]. This is true for any

product or system produced for use by humans

from shelter to weapons.

The performance concept centers on the idea that products, devices, systems or services can be

described and their performance can be measured

in terms of user's requirements without regard to

their physical characteristics, design, or the method

of their creation. The key to the development of

performance standards is the identification of sig- nificant criteria which characterize the performance

expected and the subsequent generation of

methodologies for measuring how products,

processes, or systems meet these criteria. There are many ways to describe a solution for a problem. The use of a "hard specification" is one

way. The materials specification for an electric razor is an example of a hard specification. Such a

specification, in terms of engineering drawings, as- sembly, instructions, materials listing and the like, identifies a means for cutting off whiskers. But a fundamental question which should be raised is whether this is the best way to meet the basic need.

The basic requirement for many men in our society

is to maintain their faces free of hair. Whether they

cut the hair off daily, pull out facial hair, or selec- tively destroy the hair-producing cells should be a matter of choice. Obviously, the alternative ways

of meeting this basic requirement to maintain the

face free of hair are considerably greater if we do

not define the requirement narrowly or: as one for cutting the hair off the face. A "hard" specification describes a solution in terms of its physical characteristics (means characteristics). The performance approach describes the

needed solution by identifying the problem-solving

characteristics it must have (problem characteristics).

The concept of a performance requirement is basic to the performance approach. In the case of

the problem of men's beards, the performance

requirement might be stated as follows: Custom in the United States dictates that men keep facial hair

in a tidy way. The most generally accepted method

is to keep facial hair from becoming long enough to be visible and there is, therefore, a current requirement for means of controlling the presence of facial

hair. A Performance Requirement is a qualitative

statement describing a problem for which a solution

is sought. Ordinarily, a Performance Requirement

will include identification of: What — the nature of the problem.

Who has the problem.
14 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

Why the problem exists. Where the problem exists. When the problem exists.

In the furtherance of our understanding of the

various facets of the performance concept, let us use as an illustration an aspect of housing with

which we are all very familiar — waste management.

A Performance Requirement serves to call atten- tion to a problem, and it identifies the context of the

problem. However, it does not satisfactorily identify nor define the problem in terms of the key at- tributes to be used in judging the adequacy of

proposed problem solutions. The characteristics by

which a problem is to be defined and by which

evaluation may be made of whether or not requirements are being met are called Performance

Criteria. Most problems have many facets and

require the use of multiple criteria which differ in importance. Thus, for example, the criteria for a household waste management "solution" include

consideration of health effects, of property value ef- fects and of aesthetic effects with differing importance being attached to each.

A Performance Requirement calls for a solution

to be offered. Performance Criteria give the set of

characteristics that solutions must have. What happens when two solutions are presented? A decision

must usually be made to adopt only one and, hopefully, that will be the one that is better from the

standpoint of cost and of effectiveness considered

together. To be able to make such decisions

requires that methods of measuring cost and effec- tiveness be adopted — even if they are at first crude

and approximate.

In order to be able to evaluate alternative solu- tions that are competing for adoption, it is necessary to have a set of practical measurements that can be used to obtain an "effectiveness" score for each.

What is needed is a set of tests and measurement

methods that are not means biased; they should not favor any one candidate solution. Being practical

and unbiased, a good evaluation technique will enable the scoring of any and all candidate solutions in such a way that the one with the highest score will be the one that provides the greatest amount of

problem solution. Realistically, some criteria are not readily amenable to quantitative measurement.

Simulation techniques may be useful to determine

whether the proposed solution is satisfactory or unsatisfactory. The application of expert judgment

may sometimes be the best evaluative technique

available. At times, statistical interpretation of lay

judgment may be the most appropriate metric to

use. Whatever the case, a public act of measure- ment is essential to the performance concept.

When a Performance Requirement has elicited sufficient interest to engender the development of

Performance Criteria and Evaluative Techniques,

then it is likely that an appeal will be made to technology for a solution. Usually this means specifying what is needed in a way that will communicate

in the engineering/scientific community. The fundamental performance documentation that may be

used for this purpose is a Performance Specification. A Performance Specification comprehends all of the information in the underlying requirement

and criteria. It also includes the evaluafive

techniques and it identifies the range of scores

within which solutions must fall if they are to be

considered acceptable.

With this understanding of the performance concept, let us return to our illustration of a "hard"

specification for an electric razor. The given solu- tion calls for cutting off hair as the method. It precludes the unbiased consideration of such

methods as pulling out facial hairs and killing the

hair-producing cells. In comparison, the fundamental Performance Specification for a "facial hair control system" should promote the consideration of

all such methods. It should permit the introduction

of newer, better, or cheaper means than the electric razor, if the technology can produce them.

Performance specifications can be written which

are completely unbiased about means for solving

the problem, or they can be written so that they are somewhat restrictive about the means without

being so narrowly restrictive as a hard specification.

For example, a performance specification might be

written which covers all means for freeing the face

of unwanted hair. This we could term a fundamental performance specification. Alternatively, a specification might be written to cover all means for cutting hair from the face. Such a specification would encompass safety razors, straight razors, and electric shavers, but would exclude

tweezers for pulling out hair and methods of killing

hair roots. A more restrictive performance specification could be written for all electric shavers. This

would exclude safety razors and straight razors, but

would still include a large number of alternatives.

Specifications may be derived from a fundamental

performance specification by restricting the means

of achieving needs satisfaction. For the purposes of

this presentation, we will refer to those specifica-
MEASUREMENT— KEY TO PERFORMANCE

tions which are completely means unbiased as fundamental performance specifications, and those

which apply to families of solution means as derived

performance specifications. In other words, as one approaches the employment of fundamental performance specifications to seek problem solutions, the number of effective

solutions from which a choice can be exercised in- creases. Relating the performance concept to housing, let us look at one of the categories of performance ex- pected of housing — waste management. A fundamental performance specification might, for example, define the maximum level of waste to be

tolerated in the house with no mention of means. A

derived specification would address the problem

from the point of view of establishing plumbing

requirements. A more restrictive derived specification would specify employing a hydrostatic head as a power source. A hard specification would contain

a bill of materials to be used, hardware locations in the structure, methods for joining pipes, etc. The performance concept includes an hierarchical

set of statements that define the following: per- formance requirements, criteria, specifications,

standards, and codes. We have already discussed

performance requirements, criteria, and specifications. Performance standards can result from

specifications. If the measurement techniques are reproducible, and the requirements are reasonably

common ones, a duly consdtuted body may issue

specifications as a standard to be referenced by

others, or it may become a de facto standard by

common usage. A performance code is, in effect, a performance standard that has been adopted by a

regulating body and put into practice in a legal sense. Evaluative Techniques

Evaluative techniques may conveniently be di- vided into two categories: (1) Objective measurement; and (2) Subjective measurement. Objective

measurement involves direct measurement by

scientists and engineers through the use of ap- paratuses that provide quantitative results, ex- pressed numerically and with known limits of accu- racy for the measuring device including its operation. As the first example of objective measurement,

let us look briefly at the measurement of time, one

of the four basic standards described earlier as making up the central core of the N MS. On October 13,

15

1967, the 13th General Conference on Weights and

Measures decided that [3]: "The unit of time of the

International System of Units is the second, defined

in the following terms: The second is the duration

of 9,192,631,770 periods of the radiation cor- responding to the transition between the two hyperfine levels of the fundamental state of the atom of

cesium-133."

You may ask, "Do we really need a clock that keeps time to a second in 30,000 years?" Actually

the need for timing accuracy in such fields as satellite tracking, rocket control, and astronomical observations is far from met. We must remember that

there are almost 10" microseconds in a day and

that a radio signal travels 300 meters in a microsecond. We use radio waves to measure

distances and to track satellites which incidentally move at the rate of 9,000 meters every second. So we must have clocks that can keep in step to within

a few microseconds over an extensive time interval. As a matter of fact, the NBS is now under pressure

in the Institute for Basic Standards to improve our

present time-keeping accuracy of 1 part in 10'^ by

two more orders of magnitude [4]. As a second example of objective measurement,

let us turn from the basic core of the NMS to en- gineering standards: to measurement required by a

building code on fire doors. Fire codes, to some extent, are peiformance-type codes because they

frequently do not specify the materials to be used

but rather their performance under certain conditions of test. For example, the Building Officials

Conference of America Code on Fire Doors reads

as follows [5]: "Section 917.0. Fire Doors

"917.1 Fire Door Assemblies — Approved fire door assemblies as defined in the Basic Code

shall be constructed of any material or as- sembly of component materials which meet

the test requirements of sections 903 and 904

and the fire resistance ratings herein required.

Fire resistance Location rating in hours

Fire wails and fire divisions of 3 or more hour construction 3 Fire walls and fire divisions of 2 hour construction 1 Shaft enclosures and elevator hoistways of 2 hour construction 1 '/i Stairway and exitway enclosures except fire towers and

grade passageways" %

The fire resistance is then measured by ASTM

E 152-66, "Standard Method of Fire Tests of
16 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

Door Assemblies [6]." The method is precise with

respect to: test assemblies (construction and size),

time of testing, furnace temperatures, development

of a time-temperature curve, etc. I am sure that this

test, when carefully carried out, would measure the

performance of fire door assemblies well, but would

do so only under those test conditions. The method

does not measure the performance of a fire door as- sembly in place in a building; i.e., under actual conditions of use. Therefore, such important factors as adjacent fire loads, enclosure geometry, and type of

fire are not evaluated. Further, the fire ratings as required by the code bear only indirectly on factors

critical to human safety, namely, temperature,

smoke density, and toxicity of combustion

products.

A final example of objective measurement

describes the problem of measuring the per- formance of a building material per se and relating

those data to the performance of the same material

as part of a composite or sub-assembly of a building. As an exampl e, let us look at roofing asphalt.

More than 80% of the roofing used in the USA

contains roofing grade asphalt as a primary component. Asphalt oxidizes and degrades under the

factors that make up weathering. Thus, precise

measurements of the photochemical degradation of

asphalt should measure its performance in use. Chemists can make such precise measurements by

infrared spectroscopy, for example. Photo-oxidation

rates can be measured and roofing grade asphalts can be rated on this basis [7]. The order of photochemical stability is the same for both laboratory

and outdoor exposure.

However, when asphalt becomes a part of a composite asphalt shingle, other factors, such as the nature of the roofing felt, the saturant, fillers, and

protective granules, come into play. One can no

longer be certain that photochemical oxidation of

the asphalt is the rate-controlling factor in the

degradation of a roofing shingle. Measurement must

be made on the composite material. Chemists at NBS are now making such measurements through

the use of gas chromatography, for example.

The problem does not end here. When one goes

to a built-up roof made with asphalt, failures occur due to expansion and contraction, and a roof may

crack, and leak, long before degradation through

normal weathering occurs. Thus, performance must

be measured by other methods. For example, a

recent technique — measurement of the thermal

shock resistance factor— has been used by NBS

scientists to predici the performance of a built-up

roof [8]. The measurement problem in building

science is not one of more accurate measurements on materials, but that of meaningful measurement

on larger aggregations of materials.

Subjective Measurement

Subjective measurement is based on value

judgments of the human observer, or on human

response to selected test situations; the results may

be expressed in narrative form or by arbitrarily as- signed numerical ratings.

Applied scientists and engineers often misuse

subjective measurement in two ways: (1) employing

subjective techniques where objective methods exist, or could be developed, and (2) analyzing data

from subjective measurement as though they were made by objective methods. Engineers may make

visual observations, convert these through an ar- bitrary rating system to numerical results, and use

these results for subsequent analysis as if they were

obtained through a truly objective (quantitative) process. Harper and Bratton [9], for example,

developed a point system (Table 1 ) to measure the

performance of plastics building materials upon ex- posure to weather. The entire rating system was

based on visual observation, but once numbers

were obtained, numerous curves were developed

and some firm conclusions made as a result of direct

comparisons.

Table 1. Point system used in the evaluation of changes

which occur on weathering of plastics *

Maximum Relative Weighted

Property change weight maximum

in points

Surface fiber promi- nence 10 3 30 Color 10 2 20

Resin gloss 10 1.5 15 Subsurface fiber promi- nence 10 1 10 Warp and twist 10 0.5 5 Edge effect 10 0.5 5 Surface crazing 10 0.5 5 Subsurface crazing 10 0.5 5 Resin haze 10 0.5 5 Maximum point value 100

'^Harper& Bratton. SPI Proc, Sec. 6E. p. I (1960). A major upgrading in the measurement of the per- formance of building materials can be made if subjective measurement is completely eliminated in
MEASUREMENT— KEY TO PERFORMANCE 17

those cases where objective measurement can be

carried out. Today, scientifically-based analytical

methods exist, or can be developed, to make quantitative measurements where engineers still use a

visually-based rating system. The weathering of

plastics is one area where such improvements can

be made now.

Let us turn our attention now to the realm of un- contested subjective measurement, and as an example refer to the visual environment. William Lam,

in a report prepared recently for the I AT on per- formance standards for low-income housing, had

the following to say about the existing standards,

procedures, and test methods for the visual environment:

"None of the nineteen existing industry or national standards. Federal or other published

specifications, or foreign standards, that was

examined has any useful performance tests for existing natural or artificial lighting

systems pertinent to recommendations for use in low-cost housing.

"Among building codes in the U.S., those that have daylight requirements (some do not) ex- press them in terms of window area, rather

than performance with regard to view or

light. The objectives of the requirements are not described. For artificial lighting, the

range is from no requirements at all to describing what rooms should have lighting; a few list quantity requirements. None of

these provides useful guidance to the pur- pose and qualitative aspects of the requirements [10]."

Mr. Lam suggested the following courses of ac- tion for further development of performance criteria for the visual environment in housing:

"Subjective testing procedures should be used to establish confirmation of the numerical

values assigned to the performance requirements proposed, which were based on judg- ment. Procedures might include: (1) developing standard measuring procedures

by which to rate existing housing units as meeting, or not meeting, the proposed per- formance criteria; (2) developing survey

quesUonnaires to measure user satisfaction,

and use of artificial lighting in daylight; (3) evaluating the accuracy of the ratings in pre- dicting user satisfaction, as compared to the

accuracy of present types of specification

requirements. An accurate and inexpensive

technique (using scale models) should be

developed for testing proposed designs

against the performance requirements [10]'.' Hopkinson, in his paper entitled "The EvaluaUon

of the Built Environment," makes the following

comments on sensory evaluation [II]:

"The architect and the environmental engineer

would be relieved of much uncertainty if the success of their work could be evaluated entirely by physical-measuring instruments.

However, the final judge of the success of a

building must be the human occupant. Consequently, a fruitful field of research in the

environmental sicences is the development

of methods of sensory evaluation and of the

application of these methods to yield useful

design tools to aid the architect in his work."

He cites three main objectives. "First, the need is to set standards. It is necessary to understand the nature of human sensory responses

to physical factors of the environment,

so that building standards can be set which

have a sound basis in terms of the physiological and psychological needs of the hu- man occupants. The second objective is to develop technologies for achieving these

standards, technologies which are of architectural and engineering validity. The third

objective is to develop methods of sensory

evaluation in the completed building which

will reveal whether or not these standards

have been met at a subjective level. Physical measuring instruments can check physical standards; human meters must check

human requirements. "In the search for the best methods of sensory

evaluation of the environment, the architect and engineer have had to study the work

of the experimental psychologist and the

physiologist, but always bearing in mind that

their end point is the design of buildings

and not the study of the human being."

Scientists and engineers, and perhaps architects

too, who deal generally with hardware solutions or,

in laboratory research, with objective measurement

techniques, tend to be skeptical as to the reproducibility of the human meter as an evaluative

technique. Eberhard listed the following to demonstrate the ability of human meters [12].

1. "Some humans have 'perfect' pitch.

2. Experts can visually identify paintings by their
18 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

date and school of painting and even by

artists if well known.

3. Experts can recognize musical themes and:

(1) Identify entire musical composition of

theme

(2) Identify school of music if other information is unknown

(3) In some cases can recognize performing

artists or conductor

4. Anyone can recognize famous people from a good caricature.

5. Experts can identify wine by taste in terms of

vineyard from which it comes and years of

harvest.

6. Experts can differentiate between lOOO's of

fragrances by smelling.

7. Most blind people can sense the space around

them by sound signals.

8. Most blind people can do a number of things,

including reading, by tactile senses.

9. Mothers can test the temperature of baby's

milk by a few drops on the wrist."

Heath, in a recent paper on "Problems of Measurement in Environmental Aesthetics [13]."

stressed the need for measurement and proceeded

to describe techniques useful in the field. He

expanded the theories of Hopkinson, stressing

human meters, measuring scales, models, and

analysis of responses. He concluded his paper

with the following comment on environmental

aesthetics:

"The present state of aesthetic studies resembles

that of the research work of the chemist who,

after some years labour, was able to report

that he had discovered a substance which was colourless, odourless, tasteless, and useless. There is nothing clearly established, no

chain of cause and effect, no quantitative

relationship which could be of the slightest

assistance to anyone. There are a large

number of theories, mostly wordy, confusing, and serving rather to rebut past philosophical opinion than to unify the considerable but scattered body of factual data now

becoming available. The subject urgently

needs a staunchly empirical approach and

a determination to develop methods which

can be applied to practical difficulties. It

is for this reason that this paper has concentrated on methods of measurement; for

if we can solve the problems of measurement, sound theory and practical application

will follow."

Conclusion

With respect to performance, I would modify Mr.

Heath's last statement to say, "If we can solve the

problems of measurement, both objective and subjective, practical application of the performance

concept in building can follow." The conditional

form used here is to emphasize that automatic

implementation of the performance approach will not occur as a function of availability of appropriate

evaluative methods. A coordinated effort must be

made by all concerned with the entire building process. The performance of buildings can be

measured, but it will not be easy and to a large extent will be done in an incremental manner ranging from measurements on simple materials to whole structures. Methods at our disposal are the

ever-improving analytical techniques of the

physical scientist and the ability of the engineer to evaluate whole structures. With respect to subjective measurement, the combined talents of the

architect, engineer, physical scientist, and behavioral scientist must be applied to make the

building more responsive to the human occupant.

Greater emphasis of the human being as a meter

is required both prior to the design of a building

and after its occupancy. I am encouraged by the

progress we have made here in the lAT-BRD in tackling first hand the measurement of the per- formance of buildings — from simple materials to

entire structures. We have much to do, but the

papers you will hear during this conference will,

I believe, convince you that we are gradually

making inroads towards the implementation of the

performance concept through a key ingredient —

measurement.

References

[1] Huntoon, R. D., "Concept of a National Measurement

System," Science, 158, 67 (1967).

[2] Eberhard, J. P., "The Performance Concept: A Study of

Its Application to Housing," National Bureau of Standards Report No. 9849, 1, 47 (1968).

[3] National Bureau of Standards Technical News Bulletin, 52, No. 1, 10 (1968).

[4] Huntoon, R. D., "Measurement System of the United

States," talk presented at the 1966 Standards Laboratory

Conference, NBS, Gaithersburg, Md., May 9-12, 1966.

[5] Building Officials Conference of America, Basic Building

Code, Section 917.0. 4th Edition, 232 (1965).
MEASUREMENT— KEY TO PERFORMANCE 19

[6] "Standard Method of Fire Door Test Assemblies,"

ASTM E 152-66, 1967 Book of ASTM Standards,

Part 14, 427 (1967).

[7] Wright, J. R. and P. G. Campbell, "Determination of Oxidation Rates of Air-Blown Asphalts by Infrared Spectroscopy," J. Appl. Chem. (London), 12, 256 (1962).

[8] Cullen, W. C. and T. H. Boone, "Thermal-Shock Resist- ance for Built-up Membranes," National Bureau of Standards Building Science Series No. 9 (1967).

[9] Harper, R. C. and F. H. Bratton, "Contour Matched

Metal Molded Glass Reinforced Plastics for Outdoor

[10]

11]

[12] [13]

Use," SPI Proc, Section E-6. 1 (1960). Eberhard, .1. P., "The Performance Concept: A Study of

Its Application to Housing," National Bureau of Standards Report No. 9849, 1, 247 (1968). Hopkinson, R. G., "The Evaluation of the Built Environ- ment," Inaugural Lecture, University College, London,

November 11, 1965. Eberhard, J. P., private communication.

Heath. T. F., "Problems of Measurement in Environ- mental Aesthetics," Architectural Science Review, p. 17 (March 1968).

THE USER AS THE BASIS FOR ARCHITECTURAL AND URBAN DESIGN

Michael Brill

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

rd like to talk about an evolution so rapid that it has many of the earmarks of a revolution. This is a report of things that are happening now to change

our building technology: The entire process of how

we build and all the products of that process. This

evolution is called the systems approach and is an

intellectual technology — a way of looking at problems, and a way of solving them. It is not

necessarily a hardware-rich technology composed

of reels of computer tape and electronic control

gadgets (although it may employ these), but rather an elegant intellectual social instrument and a market mechanism to assure us that our new buildings

and communities will be really responsive to our

needs. It has as its hallmark emphasis on analyzing

the intended users of physical environments and

flexibility in developing solutions to their problems.

Let us try then to understand this approach which

has as its central consideration you, the user. All physical environments, like buildings and building

groups, and communities and cities are made for a purpose. They are intended to help achieve our

goals by enabling a certain level of human per- formance to be reached. All buildings are made to help users operating within a particular system

achieve their goals. For instance, schools, homes

and hospitals are parts of an educational system, a

residential system and a health care system. Each

of these systems in turn is part of. and serves, the next larger system, perhaps a community. We could

continue on up this ladder describing systems, but

won't because we are unclear about where it ends.

It's much more complex than I have stated, for there are relationships and interactions between

systems which are delicate, precise, and not un- derstood. We often only become aware of these

relationships when we see that decisions made and

actions taken in one facet of our environment have

profound effects elsewhere, calling attention to a

relationship previously unknown.

Many of these effects are unwanted and some are disastrous — most of them are not easily predicted,

for we do not know how our building and community systems really operate. Even where we can predict this unwanted output, we are often still unable

to prevent it, because we cannot measure it accurately, and have difficulty in making decisions about

priorities involving costs and benefits. Because of

these and many other problems, it is felt by many

that the present techniques for designing and build- ing are not working well, the results being that our

present environments are inadequate to our needs,

in both quality and quantity. I wish to imply that if the product is unsatisfactory it is because the

process which produces it is also unsatisfactory.

Further, the present "system" for designing and

building is clearly inadequate to the needs of the fu- ture. In less than a decade we must more than triple our output of housing (and of course, of other community buildings and services.) but we find that the

home building industry at present is producing at a near optimum in terms of economies of scale

[1,2,3].

Because this building process can not meet our

needs, it is being changed. Because the quality of

building substantially alters our activities,

behaviors and emotions [4], the goal of this change

is to devise a process which will assure a better fit between buildings and communities and the needs

and aspirations of all of us who use them. Ed like to examine the problems of reaching this goal and at- tempt to focus down on the specific issue — the user

as the basis for design which is the central concept

in the systems approach.

We have stated that there are dysfunctions in the

physical environment, that they are process-generated and maintained and that they

are both quantity and quality problems. I will not deal with the quantity aspect, the not- enough-to-go-around problems, but with the

quality, or poor-fit problem. They are not really

wholly separate issues, but I can't deal with the

whole topic, and 1 apologize for any lapses in clarity

which arise from dealing with only one portion of a problem.

In concentrating on the user. I've also selected

21
22 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

the human user side of the poor-fit problem, rather

than the environmental side; the software, rather

than the hardware. Again, they are linked, not separate issues. I will give some examples of why

we want to focus on the user— why the user is important:

A systems view of federal office buildings for ex- ample, is that they are simply a piece of a government information processing system, along with

men, machines, and methods. If we could process

information without buildings (as someday we

might) we would do it. We have studied [5] the cost of this information processing system and find that, over 40 years, 2% is in the building itself, 6% is in the operation and maintenance of the building,

while 92% is in the people; that is, the users' salaries, therefore, we are concerned with the user, not

the building, as the cost-sensitive element. The

same kind of analysis, with similar results, has been

made for hospitals. Analyzing housing is more dif- ficult, but our experience shows that many housing

projects with high hardware standards have become

instant slums, the obvious result of user or social

problems. To quote the book. The Exploding

Metropolis, [6] "Once upon a time (says a close stu- dent of New York's slums) we thought that if we

could only get our problem families out of those

dreadful slums, then papa would stop taking dope,

mama would stop chasing around, and junior would

stop carrying a knife. Well, we've got them in a nice new apartment with modern kitchens and a recreation center, and they are the same bunch of . . . they always were."

That may be an overstatement of the problem,

but not by much. We have heard too much of

technical solutions to technical problems, when the

problems are obviously social in nature. I won't

pretend that buildings alone can solve social

problems, but when the occupants have no control over the building process and over buildings themselves, the problems these buildings are intended to solve are more likely to be compounded then al- leviated. We feel painfully ineffective when trying

to get something we want in complex situations, like our building process. John Eberhard, a leading

building process theorist and systems educator, has

called it, simply, "loneliness." We have become at- tenuated from large parts of our environment and

feel distant from where the decisions which affect our lives are made. In many areas outside of building, this has been realized and corrective action

taken. Some of the results are school decentralization, neighborhood city halls, community mental

health centers, and the community participation

called advocate planning.

And now, in buildings, we believe we have a mechanism which shortens this distance, which

enables us to be heard by men who make decisions

which give form to the things which surround us. Let me describe the distance there is now between

the users of buildings and the makers of critical parts of buildings. For example, a region grows fast and a lot of students need a high school. The school

board senses this, gets the money, and comes to the

architect. They tell him what they think the stu- dents need. He produces what he thinks is an ap- propriate design response, and the board approves.

A general contractor gets the job of building it, and

he in turn, hires subcontractors to supply and install large portions of it. They in turn buy products from

a manufacturer who is six steps removed from the

users, in this case, all the students. The systems ap- proach, concerned as it is with performance, not products, is shortening this chain. We are developing ways to let students (and other users) enter into a dialogue with the manufacturers, to let them know

what they want and need in their physical environ- ments. If makers could be sure that a product was

wanted and that it was guaranteed to satisfy,

wouldn't they make it? We believe that this di- alogue between the users and all of the makers is the critical issue today, and that the Users' Needs

are the critical element in this dialogue, and, therefore, in the design process. Users are affected in three ways by physical en- vironments—physically, psychologically, and socially. Where there is a poor fit and the user has

limited choice, crisis conditions are generated.

Physically a poor fit generates accidents and health

hazards, and can aggravate a poor fit psychologically and socially which leads to impairment of

mental health and may be one of the root causes of

riots in our streets. These social disasters are the

feedback which give a sense of urgency to our ef- forts. Where there is a poor fit, but the users have

choices and options, they will alter the environment, leave it, or not "buy" it in the first place. This

second case demonstrates that "fit" is not only a social instrument, but a market mechanism as well. It

is clear, however, that the first case is now the more

prevalent, where poor fit is accompanied by limited

choice. This is a non-constructive situation as a

free market mechanism, and it is here that the

government may, perhaps, assume the burden of or-
THE USER AS THE BASIS FOR ARCHITECTURAL AND URBAN DESIGN 23

ganizing the market and analyzing the user,

j If we could find a way of assuring a good fit,

' (physically, psychologically, and socially) between

users and their buildings and communities, we

I could assure the users' satisfaction with that en- vironment. And so we have turned to a form of

"market research:" finding out what users need and

want and through the performance concept within

the Systems Approach, helping makers design and

procure buildings and communities responsive to these needs and wants. If user needs are explicitly

stated, and form the value structure of the design

, brief, and user satisfaction is both the goal and the

basis for post-facto evaluation of the result, we

\ ought to be able to assure a "good fit," a useful so-

, cial instrument and a healthy market.

' I have two biases which should be made explicit

(if they are not already obvious) at this point: one is

' that the users' psychological and social needs are more important than the complete fulfillment of his physical needs. This is not meant to denigrate the

physical aspects of "problem" environments, but

j rather to alter an historical emphasis we have

I placed on hardware. Users themselves substantiate

i this bias by placing great value on rather limited and

restrictive space in such areas as Georgetown,

Beacon Hill and Greenwich Village. The second

] bias is not so easily substantiated. That is, that the

I best condition is not the adequate, neutral fit, but a

I condition v/here needs and wants are actually ex- ceeded by the performance of the environment,

jl where there is an excess of quality — this, 1 believe

il is the arena in which personal growth and enj richment occur. These two biases have had an imI pact on the methods developed in this paper.

|1 In gathering information about user needs, we

\ must first define the user, develop methods for ascertaining his needs, and then amass the data, in this case, statements of need in as rigorous a fashion

I as the state of the art permits. 1 want to clarify the

idea of a need. In the systems approach, we do not

; specify solutions. We only specify the need or per- formance which must be accommodated, and essen-

'! tially delegate responsibility for solutions to someone closer to the actual making of things. This

allows him to examine alternatives and does not unI necessarily restrict him in his search for a solution.

I When a user says he "needs" a heavy door and a complex lock, he is describing a solution, not a

need. There are many alternatives to his real need,

which is security. By being explicit about security, we make it possible to examine, evaluate and select

from a spectrum of hardware alternatives which will produce the desired result. This example points up two problems in developing user needs statements: all of us, as users, have

had our imaginations molded and constrained by

our surroundings. We do not think we need things we have not thought of, nor had. A case in point is: when the New York State Council on the Arts

wanted to determine what facilities would be

required for the performing arts, it interviewed not only actors, managers, and directors but also dancers, who have traditionally had grossly inadequate

facilities and are the gypsy orphans of the theatre. The Council asked them, "Now, how many

showers would you like?", they were met with a dancer's unbelieving stare and the words . . . "you mean ... we could have showers?"

The second problem is that users are not experts

in many areas, such as health and safety needs, or

the need for structural stability, and cannot state

their needs. Experts must do this work. The users, however, are the most sensitive to those social and

psychological factors in the environment which af- fect them, but may need help in articulating these

factors. We have not fully solved the preceding problems,

but nevertheless are now developing a method to ascertain user needs. [7] Our basic concept is that between the statement of a user's need and the en- vironmental solutions that satisfy them there must

be a bridging statement which specifies what at- tributes must be present in the space in order that the user's need may be met. As a simple example,

in a study environment, a user's need is to be able

to read. The bridging statement, which we call a "Required Spatial Attribute," is in terms of illu- mination—not lighting fixtures. Lighting fixtures are solutions and not yet our concern in this process. We specify how much illumination must

reach the eye from the message surface to allow the

designer to select the method which satisfies this requirement from alternatives which might include

windows, lighting fixtures, illuminated messages

(like slides or movies), or more sophisticated illu- mination methods not yet developed. We have

developed techniques to display user needs and to ascertain required spatial attributes. There are about 15 major projects [8] in this country and Canada in which buildings are being

procured on the basis of user needs and systems

techniques. The statement of user needs is proving
24 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

successful as the basis for actual performance

specifications in many of these projects.

User needs can also sharpen our cost/benefit

evaluation tools, for they give us a more precise un- derstanding of the user side of the equation, the

benefits. Too often, we make decisions which we

know intuitively to be questionable from the user

standpoint, but not having data to support our beliefs, we are forced to decide on the basis of the

easily gotten information, the costs. When cost is the only yardstick available for evaluating alternatives, reducing them can be the only goal.

Finally, we employ user needs as an evaluative

mechanism. We can simply match the designed,

built environments to the needs that generated them

as a way of checking results systematically. With it, we generate a different, more constructive kind of

feedback than we now have. At present, we employ

a crisis model of feedback, one form being the after- math commission in the wake of every upheaval. If concern for user needs could be an ongoing, constant effort to help us adjust our building programs

to changing user goals, we would have a dynamic,

online feedback mechanism.

In order to prevent your clogging the postal

system with requests for our "latest model" user needs, let's talk about the problems we have en- countered which have slowed up the work. A major one is the difficulty of clearly stating goals at a level where we can start to dissect them and develop al- ternatives. National and even local goals and policies are nowhere clearly stated. It was thought that the soft sciences — policy studies, sociology,

anthropology, ecology and psychology — would be

a great resource for deriving and examining goal statements. There are unexpected and, as yet, unexplained difficulties in transferring intellectual technology between disciplines. Another, and per- haps critical, problem has been the lack of funds to carry out this research. We tend to support those

ideas with which we are familiar. As a country, we

have grown great, largely as a result of our capacity

to make hardware of excellence quite cheaply. We

tend to want to do that to solve all our problems,

and as a result place our emphasis on hardware

research while providing only minimal support for research into user needs. Such research does not come cheaply.

The question often raised is why should user need studies be supported heavily, especially in a time of intense competition for resources? Because

it is a way, one of the few ways, to make what we

build more responsive to the people who use it — to make it theirs, and to generate pride of use. Intui- tion is no longer a sufficient base for the job. And as John Gardner warned, upon leaving his position in the President's cabinet, "we are in deep trouble as

a people; and history is not going to deal kindly with

a rich nation that will not tax itself to cure its miseries." The clear and precise delineation of this most

basic information, what users need can and does

give direction and provide a context for all other

research into physical environments. It is basic to a healthy, enriching environment and a vigorous

market.

Without this information, and the change in vi- sion which automatically accompanies it, we have

no real, rational, and systematic mechanism to prevent us from squandering scant resources, from

doing what good poker players warn against,

"Throwing good money after bad."

References

[1] The Performance Concept: A Study of Its Application to Housing. Vol. Ill, "A Pilot Study of the Economies of

Scale Related to Residential Construction", prepared by

the National Association of Home Builders for the National Bureau of Standards. Available from Clearinghouse,

Springfield, Virginia 22151.

[2] The Impact of Social and Technical Change in Building.

Gary Stonebraker for Building Systems Development, Inc. [3] Recent Studies by Professor Arnold Rosner, College of Architecture and Urban Planning, University of Washington, Seattle. Washington.

[4] Inadequate Housing Space and Social Organization by

George Gray, Dept. of Anthropology and Sociology, University of British Columbia, 1967.

[5] Building Systems Project: Status Report, prepared by

the Institute for Applied Technology, National Bureau of Standards, 1967. Available from Clearinghouse, Springfield, Virginia 22151 (No. PB 176 959).

[6] "The Enduring Slums" by D. Seligman, The Exploding

Metropolis, Chapter IV, by the Editors of Fortune.

[7] The Performance Concept: A Study of Its Application to Housing, Vol. I, II, III, prepared by the Institute for Applied Technology, National Bureau of Standards, Washington, D. C, 1968. Available from Clearinghouse, Springfield, Virginia 22151.

[8] a. First California Commission on School Construction

(Contract Documents and Performance Specifications), Palo Alto, California, July 1963.

b. Schoolhouse Systems Project #1 (Performance Specifications). Florida State Department of Education,

Tallahassee, Florida.

c. University Residential Building System (Contract Documents and Performance Specifications), The University

of California, Berkeley, California 94720, June 1967.
THE USER AS THE BASIS FOR ARCHITECTURAL AND URBAN DESIGN 25

d. Research in School Facilities, Contract Documents and Performance Specifications, Montreal Catholic School Commission, Montreal, Quebec, Canada, June 1968.

e. Study of Educational Facilities, The Metropolitan Toronto School Board, SEF Report Tl, Toronto 7, Canada.

/. Building Systems Project: Status Report, prepared by

the Institute for Applied Technology, National Bureau

of Standards, 1967. Available from Clearinghouse,

Springfield, Virginia 22151 (No. PB 176 959).

g. Academic Building Systems (an expanded version of Reference Su).

h. Schoolhouse Systems Project #2 (Performance Specifications), Florida State Department of Education,

Tallahassee, Florida.

/. Pittsburgh Great Schools Project, Pittsburgh, Pennsylvania.

j. Laboratory Systems, Binghamton, New York, prepared

for State University of New York Construction Fund.

k. Model Cities Experiment, Department of Housing and Urban Development, RFP.22.68.

/. Project for National Institute for Mental Health. Work

being done by Institute for Applied Technology, National Bureau of Standards, 1968.

SESSION II. EVOLUTION OF PERFORMANCE SYSTEMS METHOD

T. E. Ware, Chairman

332-247 0 - 69 -3

THE PERFORMANCE/SYSTEMS METHOD

(NBS- PUBLIC BUILDINGS SERVICE BUILDING SYSTEMS PROJECT)

Robert W. Blake

Building Research Division

Institute for Applied Technology

National Bureau of Standards

Abstract*

The School Construction Systems Development

Project in California and the Polaris Systems Development Project in the Department of Defense

are discussed as background for the NBS— Public

Buildings Service Building Systems Project. Distinction is made between a Building System, a

physical thing and the Systems Approach, a methodology.

The Project is concerned with a Federal Office

Building for use by a Federal tenant. Reasons for

selecting this type of building for the Project rather

than a hospital or general purpose scientific laboratories are given.

For an initial effort, application of the performance/systems method to an entire building was deemed too ambitious. The floor-ceiling sandwich

and space dividers system was selected for the

Project. This includes the finish floor, the structural

floor, the finish ceiling below, all of the accompanying services between ceiling and floor and the

space dividers. These components account for about 30 to 40 percent of the initial building cost and are site and land independent.

A study was made of four Federal office buildings occupied between 1959 and 1965 and conclusions from the study were checked against a sample

of nine buildings occupied during the same period.

Floor size, ratio of length to width, tenancy size address size, etc., are summarized.

A matrix was constructed with built elements as column heads and spatial attributes required by

the user as row designations. Built elements are

structure, heating-ventilating-air conditioning, utili- ties, finish floor luminaires, ceiling and space

dividers. Spatial attributes are conditioned air, illumination, acoustics, stability and strength of

materials, health and safety, planning, activity support, esthetic, maintenance and improvement, and

interface. The 70 intercepts of the matrix contain

information appropriate for the need. This matrix was expanded to include the building process and

the support system of the user of the building.

The needs are expressed in the matrix in terms

of performance and not hardware requirements.

Methods for determining conformance to requirements are selected or developed. The manufacturer

has the freedom to use his initative in developing

or supplying hardware to meet the requirements.

The high cost to the user of the building compared to the cost of the building emphasizes the

importance of constructing a building that increases

the efficiency of the user. The Project is being documented in a manner that

will enable parties that were not involved in the

original development to use and expand the

methodology.

It is hoped that the methodology will be found

suitable for transference to residential construction

to help meet the enormous need for adequate

housing.

'Abstract prepared by the editors. The speaker did not submit a manuscript.

29

EUROPEAN SYSTEMS FOR EVALUATION AND APPROVAL

OF INNOVATIONS IN BUILDINGS

Bruce Foster

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

Introduction

In an organized society it is necessary to regulate

the design and construction of buildings to meet

several different types of requirements. Building

codes are concerned primarily with the life-safety

and health of the building occupant. Exit adequacy

for an emergency, fire endurance, and sanitation of

plumbing are examples of such requirements. Additional concepts are imposed by those who insure

buildings. For example, in the case of fire in- surance, in addition to building features designed to insure safe evacuation by occupants of the building, more stringent requirements are needed to confine an unwanted fire so that firemen can save the struc- ture and minimize property damage. Still other

regulations may be called for by the mortgage in- dustry. The building must not only be constructed

to remain safe, it must in addition, continue to be

' marketable. This involves control of architectural

features, but more importantly consideration of the

j durability of materials and components to insure

I adequate long-time performance.

' In developing building regulations, use is made of

I existing standards; standards for materials,

products, traditional methods of construction, and

codes of practice on material use. These have been,

and still are, largely of the prescription type. They

describe materials and parts of building systems

' which, through experience gained from long usage,

I have been found to meet a range of user require- ments. When new materials, products, or systems

are offered for use, an evaluation of the innovation

is usually necessary, and this is normally accomi; plished by comparing the performance with those

I materials already deemed to be satisfactory. Such

jl a comparison immediately requires consideration

of the properties which lead to desirable per- formance by both the old and the new solution.

With the great recent advance in technology, many

i new materials are being developed, old materials

I are being put to new uses, and composites of old

and new materials are being made. The emphasis on

performance requirements, therefore, necessarily

has become much greater. There are indications

that a switch to performance requirements to

facilitate acceptance of new products is absolutely

necessary if the full benefits of technology are to be

realized. The shift requires a new kind of thinking,

the development of many new testing procedures,

and the development of techniques for rendering

expert judgment in those areas where testing

techniques have not been, or possibly cannot be,

developed.

In previous papers of this Symposium on Per- formance of Buildings, there has been considerable

discussion of user needs. In translating user needs

to final specifications, it is necessary to go through

several intermediate steps, the first of which may be

a translation of user needs into a physical descrip>-

tion of what the desired solution must accomplish.

The next step is specification of specific materials

and products which possess the desired physical at- tributes. In the case of a waste, drain, and vent system it is necessary to decide the typical chemicals and temperatures to which the piping is likely to be exposed, what structural properties are needed, any effect the specified solution may have on the fire integrity of the building, etc. Then it is necessary to develop detailed specifications for the

specific solutions which will satisfy the per- formance requirements, and which will also be

suitable to characterize the materials or products

that will meet these requirements. These are needed

for quality control and for use as purchase specifications. Examples of such latter specifications are those used for materials such as cast iron drain pipe,

copper drain pipe, cement-asbestos drain pipe, and

plasdc drain pipe.

The process of assessing and accepting an in- novation is frequently far from simple; and, in many

cases, it requires the development of new testing

techniques and the assembly of expert opinion. The

process existing now in the United States might be

characterized as only moderately satisfactory.

Usually test data and records of experience are col31
32 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

lected by a manufacturer and submitted for assess- ment and approval by model code groups or by

regulatory officials in code jurisdictions. Organizations such as the National Sanitary Foundation or

the Underwriters' Laboratories may develop test- ing procedures and apply them for a fee to products

submitted by the manufacturer.

For a number of years we have been hearing from

foreign colleagues in the building field about the

development in Europe of new systems for evaluating innovations in building materials, products, and

systems.

A. Allan Bates, then Chief of the Building

Research Division, in a paper, "A Proposed

System for Innovation of Building Construction,"

in the July 1966 issue of ASTM Materials Research

and Standards suggested that the time had arrived

for debate on this subject and for study of the need

for establishing in the United States a more central

system for evaluating innovations. As a start, I have

had the opportunity to interview a number of people

in six countries on many aspects of the performance

evaluation systems used in European countries. All cooperated fully in discussing problems of evaluating innovations, and the procedures employed in so

doing. The systems used in several countries will be

described below, with particular emphasis on those

of France and Great Britain.

France

The first of the modern systems to be established

in Europe was the French Agrement (approval)

System, which has been in operation for about fif- teen years and is furnishing the prototype for this type of activity throughout most of the world. Certain conditions in France make such a system al- most imperative. The most important of these is the

ten-year liability imposed on the contractor for all aspects of the building, even paint. This liability

makes the purchase of insurance almost a necessity.

The Insurance Industry is understandably conservative, and therefore is reluctant to insure innovations that are not proven by service records to per- form satisfactorily for a period equivalent to the life of the required liability.

The Agrement System was developed to reduce the magnitude of this restraint on the in- troduction of innovations in building. Established

by decree of the Ministry of Construction, the

system is operated by the Scientific and Technical

Center of Building (C.S.T.B.), an organization of

the Federal Government. The C.S.T.B. is charged

with a number of functions including the development of an understanding of human needs; the ef- fects of climate; and the chemistry and physics in- volved in such areas as acoustics, lighting, ventilation, durability, and stability.

The Ministerial Text which established the

operating procedures of the Agrement System

provides for a committee, of general competence,

to insure uniform policy and to advise the director

of C.S.T.B. The fourteen members represent

governmental organizations, architects, manufacturers, and contractors. They are appointed for

two-year terms by the Ministry of Construction and

are selected from 28 nominees proposed by the

C.S.T.B., after consultation with various segments

of the building industry. The Director of the

C.S.T.B. serves as chairman of the committee.

In addition, there are about 18 specialized committees, appointed by the Director of C.S.T.B.

upon recommendation of various segments of the

building industry. Each specialized committee deals

with a specific area such as floors, ceilings, etc., and

is composed of 15 to 25 experts in that particular

technology. All interests are represented on the

committee to insure that the Agrement certificates will have ready acceptance. Members must

be technically competent, and must be chosen both

for their objectivity and their desire for progress. The decision to issue an Agrement certificate requires both tests and judgment. The tests are per- formed by C.S.T.B. The judgment is furnished by

the committee and by experts from the C.S.T.B.

staff. Philosophically, the judgments need to be

"not foolish" and "not conservative." If consensus

is not reached early, more work is done. Thus far,

it has always been possible to establish a consensus. The request for an Agrement certificate must come from a manufacturer or contractor, and the

application must specifically state the area of application and the method of use. A process for which

an Agrement certificate is given may be licensed

to another organization provided that full specifications are available which will insure that the

product of the licensee is equivalent to that of the

holder of the certificate. However, a limitation may

be placed on the product limiting it to one manufacturer or even to one location of manufacture. Full

disclosure must be made which will define the

material, equipment, or process; its structure, composition, form, fabrication, the means as well as the

conditions of its use, estimates (or demonstration)

of its usefulness, and information on quality control <
EUROPEAN SYSTEMS FOR EVALUATION AN

procedures. The potential recipient must agree to respect the obligations defined by the regulations;

and to submit to any examinations, sampling, tests, or experiments, in shop, factory, laboratory or on

the job, which may be deemed necessary by

C.S.T.B.

The holder of a certificate may not mention the

Agrement in contracts unless the user is furnished the entire document. The certificate cannot be used in advertising or promotion after ter- mination of its period of validity.

An Agrement certificate can be obtained only

for an innovation. Traditional materials or decorative materials are not eligible. The material or process is reviewed from the standpoint of safety,

usefulness, and durability; with due account being

given to climatic conditions and the building regulations. The decision on issuing an Agrement is made by the director of C.S.T.B. The certificate is valid for a period of three years and then is subject

to renewal. There is no limit on the number of

renewals, although normally a standard is established as soon as feasible. The renewal system

permits a manufacturer to modify and improve his product continually. Modification is more difficult with a standard than with an Agrement certificate because the latter is applicable to only one manufacturer. Changes in the material or process during

the life of the certificate must be submitted in ad- vance for review and potential reissuance of the

Agrement certificate. The Agrement is subject to continual review

by C.S.T.B. both with regard to current production

and the performance in use of previously manufactured material. The certificate may be terminated

for cause by the C.S.T.B. at any time. Certificates

are published as official documents by the C.S.T.B.

Suspensions or retractions of existing Agrements

also are published. An appeal procedure is provided. The expense of the examination made to

facilitate the decision by the C.S.T.B. on request for an Agrement certificate, or renewal, is charged

to the requester. However, such charges do not cover the costs of developing new testing

procedures required for many innovations, or for the cost of maintaining equipment and support

facilities and technical personnel which contribute

to the success of the program. It is estimated that the requester pays only about one-third of the total costs of the entire evaluative procedure.

The certificate is not a guarantee from C.S.T.B.,

i particularly respecting confinued quality of producAPPROVAL OF INNOVATIONS IN BUILDINGS 33

tion. The Agrement is not a directive, and is not binding on anyone, but it is accepted by the in- surance industry and code authorities.

The C.S.T.B. believes that emphasis should be

placed on determination of user needs. It should

also be noted that the question of durability is given

prominence in the evaluating process. The research

programs of the C.S.T.B. are directed toward both

areas.

Great Britain

The Agrement Board in Great Britain was

established about two and one-half years ago. The

motivating force was the Ministry of Public

Buildings and Works, rather than the liability in- surance problem as was the case in France. The

Ministry, responsible for about fifty percent of

housing in Great Britain, desired to develop per- formance-type testing procedures in order to promote acceptance of innovation. The

Agrement Board was furnished with a five-year

subsidy. In general its operation is similar to that of

France. The aims and procedures are described

briefly in Agrement Paper No. 1.* The Agrement appraisal is directed primarily

toward technical matters and does not deal with

decorative aspects or economics of use. An attempt

is made to marshal available technical evidence to form an opinion on the probable performance in ad- vance of extensive practical experience in use. The

Agrement is an attempt to furnish independent

assurance that a new and relatively unknown

product will give satisfactory performance when

used in a building. It makes practical application of

the research knowledge available on the per- formance of materials in developing procedures for making the assessment. Since the evaluation is per- formance oriented, an attempt is made to assess the

component in its proposed application rather than

as a material or component for general use. The Agrement Board, a government agency,

depends upon another government agency, the

Building Research Station, for the required tests and development of some testing procedures. The

Board's own technical competence is augmented by

that of the staff of the Building Research Station.

Tests, however, can be conducted in other government laboratories and, in the future, perhaps in universities.

*July 1967. Lord Alexander House. Waterhouse Street. Hemel Hempstead, Herts, England.
34 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

The proponent of an innovation meets in con- ference with members of the Board, where he dis- closes the nature of his product (confidentially) and

provides any information available on experience

with use or testing data. The manufacturing plant is visited, and the capability for quality control is assessed. The needs for

tests and for consultation with experts are deter- mined and costs estimated. Cost includes a factor

for monitoring the performance after an Agrement is established. If a proposal is ac- cepted, the tests are performed, and a judgment

made on the implications of the test results. Also,

assessments are made about those properties for

which no tests exist and for which evaluation must

be based on expert knowledge and background.

Recommendations are then submitted to the

Agrement Board, which makes a final decision.

Unlike the French System, there is no formal special committee making a recommendation to the

Director. The Agrement certificate is valid for a period of three years and may be renewed for one

further period. The certified material's composition

or process may be altered, provided the board is in- formed and concurs that such changes will not in- validate the value of the certificate. The certificate applies to a specific manufacturer

and the plant at which the product is made. It identifies the intended use and, where necessary, gives

details of the construction, including any associated

detail about method of erection or attachment to as- sociated parts of the building. It summarizes the

functional properties and, where appropriate, gives an opinion as to whether the construction containing the product in the manner specified appears to

safisfy requirements in the building regulations.

The certificates are published by the Board and

are available to all users. Manufacturers whose

products have gained a certificate are free to use it, but only in an unabridged form.

The first Agrement issued was for a flexible

damp-proof-course (through-the-wall flashing)

material. The certificate lists the name of the

product, the manufacturer, and the assessment. The

latter states that the Agrement Board believes the

product to be a satisfactory material for the in- tended use; that the material provides a barrier to transmission of water or water vapor, does not become sticky or tacky at high temperature, and

behaves well in brickwork subjected to direct compression and to horizontal shear movements.

The certificate states that the composition of the

product has been disclosed to the Board and that continuance of the certificate depends on con- tinuance of the stated composition and on the quality control exercised to insure absence of pin holing or other defects. The Board stated that in its opinion, the product

satisfies the requirements of Regulation Bl (i) of the

Building Regulations, 1965, in relation to the term

"damp-proof course, and the requirements of

Great Britain's other three building codes.

On the subject of durability, the certificate states that forecasts rest mainly on a background

knowledge of the materials of which the product is composed, on a study of its manufacture and of its physical properties as measured on new material,

and on comparisons with similar materials accepted

in British Standard No. 743. The Board's conclusion is that this product, used in the orthodox way

as a water-resistant barrier wall, in normal circumstances, remain effective over the lifetime of the

building.

The statement on expected durability is, to my

mind, of very great importance, for it deals with the

necessity to assemble expert judgment to assess

factors of performance which cannot be adequately

measured by accelerated tests. The background and

competence of the Building Research Station Staff,

together with any outside consultation deemed ad- visable, are available to make this judgment. In the

French system the judgment is based on the

knowledge of similar experts from the C.S.T.B. and

the members of the special committee.

It was expected that the British Agrement

System would become self- supporting by the end

of the five-year subsidy. This estimate is now

questionable, partly because of an unforeseen lack

of suitable test methods to make evaluation of per- formance requirements. Also large amounts of time

are spent in working out evaluation arrangements

which are not accepted by the proponents, thus

producing no revenue. Also, utilization of the staff and facilities of the Building Research Station constitute a form of subsidy.

The Agrement Board works closely with the

British Standards Institute, and the work of the

Board is looked upon as an important potential contributor of performance-type test procedures to the

Institute. It should be pointed out, however, that in many cases a test procedure developed by the

Agrement principle cannot fully satisfy the

requirements for a standard. For example,

Agrement test procedures for waste, drain, and
EUROPEAN SYSTEMS FOR EVALUATION AND

vent systems would be developed around lists of

representative chemicals which the waste system

must resist, required structural properties, response

to temperature, etc. Such a specification has to be

supplemented by individual solutions to the general

problem, such as specifications for specific pipe

materials. The intent of the latter is to characterize

products made of specific materials, and deemed to

satisfy the performance requirements by specifying

chemical composition, flexural strength, and other

related properties, both for purchasing and for quality control purposes.

The National Building Agency (NBA) is responsible for assessing the design of housing and various

building systems. Housing systems are evaluated

from the standpoint of materials, site preparation,

fire precautions, thermal insulation, sound insulation, structural stability, chimney and flues, heat

producing appliances, and probable maintenance

problems. Arrangements are being made for the

NBA to issue Agrement certificates in its area of

responsibility. In conclusion, the Agrement is a well-qualified

evaluation. It is required by the Ministry of Public

Building and Works in the fifty percent of housing

in Great Britain in which that agency is involved.

An Agrement certificate is not required for code

approval, however, and the developer of a new

product may elect to follow the procedure common

in this country of obtaining acceptance by one or more of the 1400 local code jurisdictions, and then

using this as a lever to develop acceptance in a wider area.

Germany

A central approval agency, Zulassung, was

established in Germany prior to 1900. With the

creation of the German Federation after the Second

World War, the approval function was transferred

to the States. However, there is cooperation among

the States, and appeals may be directed to a Federal

Coordinating Committee. Testing and evaluation is carried out at a number of universities; the

proponent of the innovation having a choice of

several specializing in a given area. As in other

countries, Zulassung concerns itself with innovation, traditional materials being covered by the

Deutscher Normanausschuss (DIN) specifications.

For example, the Heidelberg Cement Company has

a Zulassung for masonry cement, a moderately new

product in Germany, while more conventional ce- ments are covered by DIN standards. The ZulasAI'PROVAI OF INNOVATIONS IN BUILDINGS 35

sung system also utilizes committees comprising

technical experts, architects, engineers, producers,

and users. Denmark

The approval system in Denmark is operated by

the Danish National Institute of Building Research.

Evaluations are made in the laboratories of this or- ganization, but tests may be carried out in an ap- proved industrial, technical, or university laboratory. The proponents must state the intended use of

the material, or system, and cite pertinent requirements in the code.

About 100 approvals are processed each year. Many of these are assessed by routine procedures

and do not require development of new testing

methods. The proponent pays three quarters of the

expense. Approvals are denied if there is insuffi- cient experience in product use, if the request is purely for advertising purposes, if it concerns only

minor changes in an existing product, or if it is to be

a one-time use. Approval is given for a stated

period, but it may be renewed. There can only be one reapproval, but this may be followed by a per- manent document. The latter may consist of a new

type of evaluation procedure rather than a conventional standard. Another government organization,

the National Test Station, works in close cooperation and is responsible for labeling products meeting

Agrement requirements and conventional standards. Building inspectors are required to accept

approved items.

Netherlands

The Agrement system in Holland is conducted

by the Ratiobouw. The Ratiobouw has no laboratories and depends upon universities for testing. The

issuance of an Agrement is by committees, to which the Ratiobouw makes its recommendations.

This is in contrast to the French system where the

committee makes the recommendation to the

Director of C.S.T.B. At present, contractors and

manufacturers are not represented on the committees, but they may be in the future. There is a separate committee for each area such as floors,

ceilings, etc. There is no legal requirement for ac- ceptance by the code officials of the assessments,

but since the large cities are usually represented on

the committees, acceptance is assured. The

Agrement is required, however, in housing sponsored by the government, which amounts to about

eighty percent of the total.
36 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

The UEAtc-Agrement Union

It will be noted from the descriptions above that the various Agrement systems have a great deal

in common. This community of interest has led to the establishment of an official Union of

Agrement systems. Present members are Belgium.

France, Greece, Italy, the Netherlands, Portugal.

Spain, and the United Kingdom. Austria and

West Germany have observer status. The latter will soon become a full member. The Union issues

Common Directives which establish the procedures

of assessing various products and systems for ex- ample, windows. The Common Directives enable one country to use an assessment carried out in another. Thus, potential exists not only for a full national market, but also for an international one. An

Agrement given in one country does not auto- matically insure its adoption by other member

countries of the Union. Each member retains the

right to decide in such matters. In accepting each

other's assessment, or in using the Common

Directive, a country may find it desirable or neces- sary to take special account of conditions peculiar

to its own situation such as climate or building regulations. Under the system potential exists for countries to develop expertise in specific areas, and

thereby to be in a position to serve the needs of all the members of the Union. The Union also

prescribes methods for arriving at Agrement

decisions including the use of technical experts to make assessments in areas where testing

procedures are not available.

Summary

Certain aspects common to all of the systems

should be pointed out. All are limited to evaluating

the performance of innovations. Their assessment

is based on stated uses or methods of application of

the innovation. The need to develop new testing

procedures, a cost which probably cannot be

equitably assessed against the proponent of a new

system, requires a substantial subsidy in many

cases. Each system relies heavily on the collective

advice and judgment of a group of technical experts

who assist in interpreting the test results, who may

participate in designing the test program, and who,

most importantly, estimate from background

knowledge the probable performance related to areas for which no testing methods exist. Such experts can be assembled from many sources, but it appears that organizations such as the French

C.S.T.B. and the British Building Research Station

offer the most concentrated, and hence readily

available, sources of research knowledge to supplement that of representatives of other segments of

the building industry in arriving at Agrement-type decisions. As far as can be

judged, the approval systems described fill an important need in the building process and have obtained a high degree of acceptance by all segments

of the building industry, even though dissent is not wholly absent. It is hoped that the study upon

which this report is based will be useful in the

design of a new procedure for the United States in assessing innovations.
MODULAR COORDINATION: A BASIS FOR INDUSTRIALIZATION OF THE

BUILDING PROCESS

Russell W. Smith, Jr.

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

I am sure you are all familiar with the story of

Cinderella, her beauty and talent, how she was

ignored and confined to a chimney corner, and how

j a Godmother appeared and performed an act of

magic — removed the dirt and grime, allowing Cinderella to appear as she really was. and to claim her

place as princess of the land. The building industry also has its Cinderella. This

Cinderella is my subject today, modular coordination. Since 1938, its value and utility have been

recognized. But it too has been ignored and confined to a chimney corner by a lack of building in- dustry concern. The story of the building industry's

Cinderella — of modular coordination — is only half

finished, however. Modular coordination is still in

its chimney corner, but I am confident that its Godmother has appeared, and that there is in process an

act of magic which will soon release modular coor- dination so that it can become a princess of the

building industry. The Godmother of the building

industry's Cinderella is the current need to double

our output of housing and substantially increase the

production of other buildings, all within the next decade. The magic ingredient that will make modular coordination a princess of the building industry

is the recognition by all concerned that the job

probably cannot be achieved without it. To understand why this is true, let us look at modular coordination. How is it defined, what is its function, and why is it essential to the economical

production of a higher volume of housing? First, the

module referred to in the term modular coordination is a unit of length as precise as the state of the

art of metrology can make it. It is currently fixed, in a United States of America Standards Institute

standard, at four (4) inches. This is the fundamental

unit around which the dimensional coordination of

the building industry has been established. Thus,

the modular unit has become the basis for dimensioning in the building industry. The basic module

is the "meterbar" for building, and, because it is

metrology, it should be treated as a precise science

of measurement on which all standards for building

industry measurement should be based.

If this, then, is the meaning of modular, as used

in the term "modular coordination," what is the

meaning of "coordination" in the same context? To

answer this we must look at the history of modular

coordination. Initial work begun by the Albert Farwell Bemis Foundation was directed toward industrializing the home building process. The objective was to establish the basis for applying to building

those principles of industrial efficiencies that Mr.

Bemis had seen applied to other industries during

the industrial revolution around the turn of this century. To establish this basis meant the development

of a body of industrial standards for repetitive

processes and interchangeable parts, made possible

by other standards for the control of dimensions

and of quality. The latter standards were, of course, based in turn on the science of metrology which

controlled the preciseness of measurement, of

dimension, and of quality. It is clear that Mr. Bemis saw as his objective the establishment of standards

which could increase the efficiency of the manufacturing process that produces buildings; standards

related to the process of manufacturing buildings, not to the result, the building itself. This is important.A working definition of modular coordination can now be derived. It is: "A system of standards for the industrialized production of buildings based on

the metrology of the module." Again, "A system of

standards for the industrialized production of

buildings based on the metrology of the module"

keeping in mind, of course, that the module is an

established unit of measure of exactly four (4) inches.

With this definition in mind, let us examine the

function of modular coordination. But, before doing

this let me establish a painful and very embarrassing

fact. Perhaps only one segment of the building in37
38 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

dustry today can truly claim to be industrialized. If you subdivide the so-called building industry and

put those who manufacture the parts and materials

that are supplied to the site on one side, and the

construction, or assembly, of the building itself on

the other, you will see that the supplier segment is highly industrialized. Gypboard and plywood are manufactured with all the production efficiency of auto windshields. Production line efficiency in the

manufacture of furnaces and air conditioners equals

the efficiency found in the manufacture of their

equivalents on aircraft or auto production lines. The other segment of the industry, however, that assembles the suppliers' parts into the final product,

the building, is not industrialized. For example,

compare the assembly of a building to the assembly

of an automobile, in the case of the automobile, the

design of the final product and the design of the

parts are coordinated so that manufacture of the auto is essentially an assembly process, with little or no fabrication required. In the case of the building, the design of the product and the design of the

parts that comprise it are not coordinated. Fabrication or modification is required of almost every item

during assembly. The fact that there is little or no

true industrialization in the segment of the manufacturing process that assembles buildings from suppliers' parts is of little concern as long as the time

and labor required to make things fit are available,

and their use and cost are acceptable. This on-site

fitting process has, of course, been traditional in the

assembly segment of the building manufacturing

process. Unbelievable as it may be, the simple fact

is that the final assembly segment of manufacturing

buildings has not yet adopted the basic industrial

principles that revolutionized the mechanical industries a century ago. The broad function of modular coordination is to make possible the introduction of basic industrial

principles that will bring to building the industrial

efficiencies that came to the mechanical industries

100 years ago. To understand how this can be ac- complished, let us look at what happened in mechanical manufacturing. Before the nineteenth

century industrial revolution, in mechanical manufacture, as in the final assembly of most buildings

today, well-fitted and beautifully finished work was

produced. It was produced with great skill by fitting

part to part. There were no common standards controlling dimensions or fit. The need for such stan- dards arose only when large numbers of like products were produced and the advantages of assembly from interchangeable parts, without modification at the time of assembly, became apparent.

Not surprisingly, these general principles were

first applied to the manufacture of guns. This happened in France in 1776. Principles and techniques were established for interchangeability of manufactured items, including standard sizes for bores and

ammunition, the fixing of tolerances of fit for components, and verification of the sizes of all parts by

"go" and "no go" gauges. Eli Whitney applied

similar techniques in manufacturing rifles for the

U.S. about 1800, as well as in cotton gin manufacture.But it was not until Joseph Whitworth identified

them between 1840 and 1880 that the fundamental

requirements for repetitive manufacture were

clearly established. Essentially there were four

requirements.

The first was metrology. Whitworth recognized

the total dependence of mass production on com- mon dimensional standards.

The second was the need for an accurate plane

surface for reference. Of this, Whitworth said, "All

excellence in workmanship depends on it, for

without such a surface many component dimensions are impossible, or are difficult, to measure and

there cannot be a control of warping and other

distortion."

The third essential requirement for repetitive

manufacture was dimensional control. Whitworth

understood the requirement for measurement stan- dards to which the dimensioning of parts could be

referenced. He saw this as freeing manufacture

from the need for direct part to part comparison.

The fourth and last requirement, but not the least, was standardization. Whitworth said, "The very

soul of manufacture is repetition," and on this belief

he based the work for which he is famous — the

standardization of screw threads.

In addition to the standardization of size and

shape, Whitworth advocated limited series of size gradations. This did not come about for many years. Speaking in 1 856 on the subject of size gradations,

he said,

"This question is also well worth the attention of our architects and builders. Suppose . . . windows

and doors . . . were made only of three or four

different sizes. Then we should have a manufactory start up without reference to any particular house or builder. They would be kept in stock,

and made with the best machinery and contriv- ances ... we should have better doors and windows at the least possible cost . . ."
MODULAR COORDINATION— A BASIS FOR INDUSTRIALIZATION OF THE BUILDING PROCESS 39

Thus Whitworth not only furthered the mechanical

industrial revolution, but he early saw the value of

production standardization for the building in- dustry, advocating the establishment of correct measurement and its corollary, proper gradation

of sizes, as the basis for repetitive manufacture we

call industrialization.

Leaving Whitworth and the establishment of

the basic principles of industrialization that he

pioneered, let us go on to the application of these

principles in the mechanical engineering field. It may or may not be true, but there is a story about

Henry Ford which sums up industrial standardization. He is supposed to have been walking through

the assembly plant one day when he paused at a room where newly completed engines were being

test run. He asked, "Why are you running those en- gines?" " 'To determine that the parts fit properly,'

" was the answer. "Establish production standards so

that the parts fit, and eliminate testing," Ford commanded. To bring about this change demanded a higher precision of metrology, and new standards

for the dimensioning of parts, for governing fits and

tolerances, and for quality control. As a result, parts were fabricated to fit a standard rather than to fit each other, and part to part fitting was virtually

eliminated from the auto manufacturing industry. Parts became truly interchangeable in both as- sembly and replacement. Whether this happened in just this way or not. it is true that in the early

1 900's, the cost of a Model T dropped to $250 from

the $800 it had been 8 to 10 years before. It is significant to note that this did not require a drastic in- novative change in the Model T itself. The function of modular coordination is to pro- vide the building industry with the same type of in- dustrial standards now applied to the mechanical in- dustry. This could bring about the same type of cost reduction in the final assembly process of the build- ing industry that occurred in the case of the Model

T. It will be accomplished when the design of

buildings, and of their component parts, is controlled by standards of such reliability that buildings

may be assembled without the modification of a sin- gle component. When we can assemble a building

as we do an auto engine from random selections of

interchangeable parts, without modifying any, then,

and only then, can we say the industrial revolution

has come to the assembly of buildings.

It might be well to mention here that achievement

of the industrialization offered by modular coor- dination does not require factory prefabrication of

buildings or of components. Quite the reverse is true, since modular coordination permits the application of production line efficiencies and economies

to on-site manufacture of components and to as- sembly procedures, as well as to manufacture in a

plant. Whichever procedure is followed, dimensional finishing will occur only once, when it is most

efficient. And once a component is fabricated by

fitting it to a dimensional standard, it should require no alteration. Sound standards establish ground

rules for the application of industrial efficiencies to

all construction regardless of whether it is conventional or innovative, on-site or in a factory. Modular

coordination is truly non-discriminatory.

Initially I posed three questions concerning

modular coordination. What is it, what is its function, and why is it essential to the economical

production of a higher volume of housing? Two of

these questions have been answered. Modular coor- dination has been defined as: "A system of stan- dards for the industrialized production of buildings

based on the metrology of the module, currently

established in the U.S.A. at 4 inches." The function

of this building industry Cinderella is to provide a

princess-like rule of industrial order which will allow the assembly of buildings from compatible

and interchangeable parts that require no modifications for fit during final assembly.

This brings us to the last question concerning

building's Cinderella. Why is it essential that modular coordination be brought out of the chimney

corner and made a building industry princess? The

answer is quite simple. There is no way we can double the production of housing in the next decade,

and do it economically, without increasing the

producfivity of the industrial system that now

produces housing. If you look at the vast investment in plant and equipment, in manufacturing expertise, in know-how, distribution, warehousing

systems, expertise of the design professions, skills,

and trades, and comprehensive managerial competence, you will see that this vast industrial capability to produce housing is to the housing produced

as that part of the iceberg below the water is to the

part above.

Barring an end to the Viet Nam war, and the

development of some system whereby the industrial

base that now produces armaments could produce

acceptable housing, it is doubtful whether we could

create in ten years a new industrial capability equal

to, and replacing, the existing industrial base that now produces U.S. housing. A contribution could
40 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

come from some totally new innovative industrial

system. But, if we are to solve this problem and pro- vide adequate housing, we must solve it as other na- tions faced with the same problem have solved it —

by concentrating our efforts on increasing the

productivity of the existing industrial system that produces most of our housing. Such an increase in productivity means not only more units produced,

but also a lower cost per unit. It is an economic

necessity to utilize to the fullest extent possible the vast industrial capacity this nation has created

within its building industry.

This is the magic that is occurring which, I am

certain, makes the recognition and use of modular

coordination inevitable. The time has come to dust

off the building industry's Cinderella, to present her

to public view, and let her bring about the increased

productivity of which our building industry is potentially capable. While we are looking for new

and better systems, however, let us not fail to "systematize" the very good industrial base we al- ready have. To overlook or neglect this vast resource could be tragic.

Quite often at this point in a presentation of this type, the speaker comes to an embarrassing mo- ment of truth. After dwelling at great length on the

importance of his subject, he may face the reality that little or nothing is being done to implement his views. Fortunately for me as a speaker, and for the

building industry, this is not true of modular coordination. The National Bureau of Standards is sponsoring within the United States of America

Standards Institute an activity which is moving

ahead rapidly to accomplish the objectives about

which 1 have been talking. This activity is the

responsibility of the USASl Standards Committee

A62, "Pre-Coordination of Building Components

and Systems." In less than two years it has

established itself as the recognized central forum

for developing standards for dimensional and functional coordination of building components and

systems. To do this, A62 has had to develop an ef- fective organization for achieving its objectives.

This organization now includes over 30 trade as- sociations, 20 major corporations and 5 federal

agencies, and embraces most of the major interests

in the diverse building industry. The effective

government-industry partnership in A62 assures

that the standards it is producing will be useful and

applicable to all phases of an exceedingly practical

industry.

In the same time span, A62 has made other major

strides. First, it has developed the procedures under

which it is now operating. I would like to stress the

"now operating," and qualify it by adding, "very ef- fectively." The work of standards-writing technical

committees is guided by subcommittees which con- cern themselves solely with determining the scope

of standards needed, and assigning priorities ac- cording to importance, so that the efforts of the

committee will not be wasted and each effort will build upon the last. In A62 there are now four of

these programming and planning subcommittees.

They deal with:

1 . a basis for dimensional coordination;

2. a basis for functional coordination;

3. a basis for communication coordination; and,

4. the application of these three coordination

bases to manufacture, design, and erection

procedure.

At the request of USASl, A62 accepted responsibility for U.S. participation in the modular stan- dards activities of the International Standards Organization (ISO) and the Pan American Standards

Commission (COPANT). This means that the A62

Sectional Committee has agreed to establish the

U.S. position on standards under consideration by

both these organizations.

Acceptance of ISO and COPANT responsibility

opened liaison between A62 and the work being

done on component coordination and modular coordination throughout the world. This ISO contact has made possible working relations with the

leaders of modular coordination in most of the

major countries of the world and has opened the

way for an exchange of information. It has also

brought to our attention several standards, and

many working documents, which were not otherwise available, and which have direct application to our work.

Perhaps the most important ISO activity concerns the British. They were recently named as the

secretariat of a new ISO subcommittee (SC5)

which is charged with developing an orderly pro- gram of work, and a priority of projects to guide the

ISO international modular effort. This corresponds

very closely to the efforts of the A62 programming

and planning subcommittees, and A62 participation on the new SC5 has been arranged so that we may

have this valuable input to our work. It should be

particularly valuable since the British are combining their conversion of the building industry to metric and modular coordination into a single package.

Through this combination, the increased produc-
MODULAR COORDINATION— A BASIS FOR INDUSTRIALIZATION OF THE BUILDING PROCESS 41

tivity resulting from the modular technique offsets the cost of converting from inch to metric measures. Canada also is using this work as a basis for pushing

modular coordination.

As for actual accomplishments to date, a stan- dard establishing a systems module and series of

compatible component dimensions for horizontal

dimensioning has been approved by the A62 committee and accepted by the Construction Standards

Board of USASl. It is being published by USASl

as USA Standard A62.5, "Basis for the Horizontal

Dimensioning of Coordinated Building Components and Systems." It will be available from

USASl as soon as printing is completed. The

technical subcommittee that developed this stan- dard was chaired by W. Burr Bennett of the Port- land Cement Association. Other members in- cluded:

H. F. Hann, Sears Roebuck and Co.

G. Hanson, Sallada and Hanson

D. E. Morgenroth, Owens Corning Fiberglas

G. J. Murray, American Iron and Steel Institute

L. Pearlmutter, Prestressed Concrete of

Colorado. Inc. W. K. Piatt, American Telephone and Telegraph

Co.

J. W. Glaser, The E. F. Hauserman Co.

M. K. Snyder, Butler Manufacturing Co.

I think that the work this subcommittee did in establishing this first A62 standard was more than

just writing an American standard. This standard

establishes the basis for dimensional coordination

in the U.S., and can be thought of in the same light as you think of the alphabet, the meter, etc. Many,

many standards for many, many years will be based on it and it will be the keystone for future dimensional coordination in the building industry. I feel that both Burr Bennett and Jack Gaston of Armstrong Cork Co., chairman of A62, have done a

great job in leading the committee effort and bringing this standard to fruition. Another subcommittee, chaired by Jim Parker of

General Services Administration, is far along in drafting an equivalent standard for ve-ncal dimensioning.

Other subcommittees are working on standards

establishing:

(1) a basis for functional compatibility and in- terchangeability;

(2) basic coordination relationships and systems;

(3) definition of terms; and,

(4) adaptation of modular drafting for computer

usage.

In summary. Committee A62 has established it- self as a viable organization, has become operational, and is now a significant national force,

developing fundamental standards leading to a ra- tional industrialized building technology. If support

of this cooperative and voluntary government-industry effort continu s to grow at the rate it has in the past two years, it will do the job 1 have outlined,

and do it well. It will also do it soon. The support of

everyone concerned is earnestly and urgently

solicited.

SESSION III. SOME ASPECTS OF LOW-COST HOUSING

J. O. Bryson, Chairman

332-247 0 - 69 -4

GOALS AND INTERGOVERNMENTAL COOPERATION IN LOW-COST HOUSING

B. T. Craun

Department of Housing and Urban Development

The subject I'm speaking on today deals with the

cooperation of the Department of Housing and

Urban Development with other government and

non-government organizations in bringing new

technology to housing. Mr. Bryson, the moderator

of this session, was an important link in some of the

work that was conducted here at the National

I Bureau of Standards which I will discuss,

j The national housing goal has been established at

I 26 million new units during the next ten years. This

j is approximately twice the present national rate of

housing construction. Of the 26 million units, 6 million are to be constructed specifically for the lower

income families. This 6 million units represents a

truly major increase for the present HUD sup- ported rate of construction. Presently, Housing

Assistance Administration, one of the sub-agencies

! within the department, is constructing or causing to be constructed, roughly 50,000 units a year. This

j is up over what it was several years ago. However,

I you can see that jumping the rate of 50,000 to

j 600,000 a year is a very significant increase.

We have many many problems in trying to ac1 complish our goal of obtaining these 600,000 units.

' There are really four items which we don't feel that we really know. First of ail, we really don't know

how to build housing for lower income families. By

this I mean, there are many things that are impor-

! tant to the lower income people which we as middle

j income, middle class people, fail to recognize. Let

f me give you an example. In one project that we un- dertook in an isolated area. Rosebud Reservation

' in South Dakota, we found that it was far more important to provide the house with a wood burning

I or oil burning stove than a central gas furnace,

which used butane. It was more important because

I this matched the income pattern of the people. They

, could always obtain 50 cents or a dollar's worth of

ij coal oil or wood to keep warm in the winter time,

, but they could not fill a butane tank with butane.

I They just didn't have the money. So this was important to the people, that they be able to visualize, to

I ' Mr. Craun died shortly after the Conference; the Editors

! have prepared his paper for publication.

\

understand how they can operate their housing.

There is also the matter of reduction in cost. We

find that we can build housing that meets the needs

of these people cheaper, than what we can build, if we follow the standards that we have normally set. The second thing we don't know is how to rapidly

and effectively produce housing, that is, produce

quantities of housing at the lowest cost. Thirdly, we

don't know how to pay for this housing. We know

that there are many mechanisms, such as government subsidies, that can be tried, but how and

where these should be tried, we still don't know.

And fourth, we don't really know how to effectively

manage the housing after it is built. We do know

that many projects fail because of poor management. We have numerous examples of this and we

feel that other projects are highly successful

because they involve the people themselves in the

management. This is an area in which considerable

cost savings can be effected. All of these we are looking into, one way or another.

To accomplish this goal of six million units for the

lower income families at today's prices and using

today's technologies, will cost something in excess

of $100,000,000. Any reduction in the cost can

serve three important and valuable functions: (1) reduce the cost to the government, (2) potentially

allow more families to be housed more rapidly, and

(3) allow more lower income families to obtain

self-sufficiency and self-respect by paying for their

housing. We think these are all very important

aspects.

Accordingly the government is trying to find

ways of providing housing cheaper. Congress has

given HUD both the authorization and appropriations to encourage new and improved methods of

housing lower income families, thus, allowing

greater freedom in innovation and experimentation.

I must point out that by definition, the rapid construction of attractive and low cost housing for lower income families will require a great deal of in- novation in all activities of the housing industry. We

have the programs for conducting experiments and

building experimental houses. In fact, one of our

programs, an insurance program designed for ex- 45
46 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

perimental housing, assures that the home owner,

if it's an individual house, or the project, will not

suffer by virtue of the experiment. We will repair

damage and so forth due to the experiment for the

life of the mortgage, up to forty years. We have been working with numerous cities and

in all cases we find that the city building code is designed to protect the life and safety of the occupants of the building. It is not designed to permit ex- perimentation, and the enforcing agency, the building department, is only warranted in issuing a building permit when and if they can be assured that the

building is safe. Over a year ago we undertook an experiment with the Roman Catholic archdiocese

of the city of Detroit to try to test a new technology

in Detroit. This particular experiment had two

goals: one was to involve the local low income people in the actual design of the housing which they

would receive, and the second was to test the cost effectiveness of a new construction system, the

Neal Mitchell system. Mr. Mitchell will talk about

both of these items, I'm sure. We were proceeding

along well until we found out that the new material,

which was a cellular concrete, did not meet the

provisions of the building code of the city of

Detroit. As a consequence the building permit

could not be issued. The city buildings department

could not be assured that the use of cellular concrete as a structural material was valid. As a consequence, we had numerous discussions with

the people in the city of Detroit and they organized

a local board of professional engineers to look into

the matter of cellular concrete and make recommendations. The Government in turn, called upon

Mr. Soteriades of the National Academy of

Sciences, Mr. Heightman of the Corps of Engineers

and Dr. Pfrang of the National Bureau of Standards

to review the plans, specifications and so forth, to

try to assure all of us that this building was safe. I want to assure you at this time that HUD does not intend to experiment with structures which will be

unsafe or which will cause any risk to the occupants.

The group of three gentlemen, the experts that I mentioned, proceeded to get together with the local group of engineers from the city of Detroit and

work up a test program, which if successful, would

produce conclusive results on the adequacy of the

structure. Accordingly, HUD undertook a contract with the National Bureau of Standards and a full- scale laboratory test was made. I believe this was

one of the first full-scale laboratory tests of a

multi-family housing system performed in this country. I know there's been other full scale testing

of housing, but I think this is one of the more per- tinent firsts in this country.

We believed that once the National Bureau of

Standards performed the test, the results would

then have national applicability. In other words,

any city throughout the country, would accept our

great National Bureau of Standards' work. As a consequence of the test results which Dr. Pfrang

will discuss in more detail, the city of Detroit found

that they could accept the structure and have done

so and have issued building permits.

I had hoped that by the time I appeared before

you today, I'd be able to tell you that the buildings are under construction. They are not yet under construction. You people that are in the construction

business know all the involvements of trying to get

from the building permit to the ground breaking.

However, I will say that our present schedule,

which looks very realistic, calls for the construction

to start on October 15. There will be a ground

breaking ceremony on October 8 and utilities will be installed about that time.

I need to point out that this, while it appears to be

relatively simple, establishes a first for HUD and

for the National Bureau of Standards and for the

National Academy of Sciences. We have all worked

together and have now found a method for working

with the cities which we believe can assure them of

the adequacy of new products or new systems.

Essentially, 1 must say, we are interested in the new systems approach and we are now prepared to go even further with other systems as the need

arises. I've had numerous discussions with the people from the city building department and they seem

very well pleased with the fine cooperation that exists between the government, that is the National

Bureau of Standards, the National Academy of

Sciences, the Corps of Engineers, and ourselves

and themselves and their committee of local professional engineers. We believe that we have

established a method whereby we can work suc- cessfully with the cities.
DESIGN ASPECTS OF A LOW-COST HOUSING SYSTEM

N. B. Mitchell

Neal Mitchell Associates, Inc. 149 Putnam A venue Cambridge, Massachusetts

Abstract*

The morphology of a systems approach to the

design of low-cost housing is described. Design

should respond to the proper interfacing of the vari- ous components and optimization of the components with respect to the total system. The

development of appropriate hardware is pro- grammed as well as the design process network

schedule and the construction process network

schedule.

To satisfy user requirements consideration is given to space requirements, deterioration, flexibili- ty including opportunity for expansion, and capability of individual expression to provide the user

with an identity of their own. The user must be

given something to look forward to. a piece of the

action on a scale that does not destroy his dignity.

Non-verbal people can communicate if the

proper method of communication is selected. People were allowed to arrange furniture for the various rooms in open spaces uninhibited by walls. A sur- prising result of this activity was that the room sizes

required for the furniture arrangements were

smaller than rooms originally rejected by the people

as being too small. To aid in design an interaction matrix involving

36,000 points of contact was established. Examples

of the items in the matrix are manufacturability,

productivility. livability, rooms interrelation, rela- tion of one apartment to another, relation of a group

of apartments to the urban sector, etc. User requirements were developed from the social standpoint to aid in building an environment

where reasonable living standards could exist. How-

*Abstract prepared by the editors. The speaker did not submit

a manuscript.

ever, it is essential also to consider cost and this in- volves initial cost, maintenance cost, rehabilitation

cost, component obsolescence, interface obsolescence, depreciation rates, social and economic

values, etc. The basic design made the wall system linear so

that parts could be shipped like Lincoln Logs and

walls plugged in or out. The system would alleviate the cost-bind by permitting the development of a market for used components.

By providing for vertical as well as horizontal ex- pansion, a variety of housing types is possible.

Designing a system that is easier to expand in certain directions permits some control over the

growth of a community by orientation of the interior module.

A few of the many things to be considered in predetermining what should be developed are

trade-offs, interactions, cost-savings, exterior

finishes, architectural and social aspects, and inter- play of spaces. Other considerations are how to build alternative sets or units — single family to three-story housing — with a fixed system, how to give people opportunity to make choices — a front

porch if they want to see the action on the street or a private urban space in back if they want

isolation, and how to develop a heating system

that can be expanded easily to include humidity

control, air conditioning or electrostatic precipitation at a later date. To meet the housing needs of the country it is necessary to sophisticate the technique, the

scheduling, the materials flow, research and

development process for developing new materials,

the performance requirements and reduce the waste

time in construction.

The fundamental concept is to build a housing

system rather than a structural system.

47

PERFORMANCE TESTING OF A LOW-COST HOUSING SYSTEM

E.O. Pfrang

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

As the title of this talk indicates, I will be

discussing the full-scale performance testing of the

Neal Mitchell Housing System mentioned in the

previous talk. However, rather than interpreting my

remarks in terms of this particular system 1 would

prefer that you view them in terms of the general

problem of the performance evaluation of innovative building systems. It is easier to speak in terms

of a specific example to demonstrate what we mean

by performance evaluation.

Full-scale performance testing is really nothing new. The Europeans in their bridge construction

have for years insisted on a full-scale performance

test before putting their bridges into service. Many

of you have undoubtedly seen photographs of lines of heavily loaded trucks on these bridges. However,

this concept is relatively new in the area of housing.

We are, in fact, just beginning to apply it. The Eu- ropeans use the performance test as an acceptance

test. The thing that we are proposing here is quite

different. What we have in mind is the evaluation

through performance testing of a prototype which

is in itself representative of a great number of build- ing units. Before going too deeply into this talk, I want to caution that performance testing is by no means a panacea. We cannot at this point of time fully evaluate a building system purely on the basis of a test. We must supplement the information by applying

judgment. It might be well for us to reflect upon the

traditional method of evaluating building systems

from the structural standpoint by analysis and computations. We might say that we test the structure numerically. However, even here we supplement

these numbers with judgment. We apply judgment

in the interpretation of the computations. No one would be rash enough to say that computations

without judgment could be used as a basis for the

evaluation of the proposed building structure. Just

i as we use judgment in our traditional methods, we

must also apply judgment in the interpretation of

the results of performance tests. The judgment

which is necessary for the evaluation of building

systems subjected to performance testing must be

provided by a person with a high degree of professional skill and an understanding of the behavior of

structural systems.

Figure 1 shows a model of the Neal Mitchell

Housing System as proposed for erection in Detroit. Before the Commissioner of Building and

Safety of the city of Detroit was willing to accept

this system he had to be convinced of its structural adequacy. Essentially, he was saying. "Prove this system mathematically." He was asking that this building be proven in a manner similar to that which was being used for all of the other buildings

proposed for erection in Detroit. However, as you

have already gathered from Mr. Mitchell's remarks

in the preceding paper, this was a highly innovative

system, which had a number of departures from existing practice and from existing codes. It would

have been either impossible or at any rate extremely difficult to mathematically prove the system. Mr.

Mitchell did submit computations concerning the

system. These computations were, as far as the

state of the art permitted, quite reasonable. However, there were a number of details — such as the

properties of the cellular concrete, the interconnection of components, the methods used in obtaining

continuity, the strength of the walls, and other

details which were in question. Negotiations

Figure 1. Model of the proposed housing system. 49
50 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

between the city of Detroit Archdiocese, which was

the sponsor for this particular housing project, had

gone on for over a year with no real headway being

made.

The Department of Housing and Urban

Development, which was providing funding for this project, had been following the difficulty in Detroit

with considerable interest. After it became apparent

that a reconciliation between the two sides by tradi- tional procedures was not possible, HUD decided

to try a somewhat different course. It first ap- pointed an advisory panel consisting of The National Academy of Sciences, the Army Corps of

Engineers and the National Bureau of Standards. It charged this panel with investigating the structural adequacy of the system proposed for erection in Detroit. The panel reviewed in considerable detail the plans, the computations and the specifications

of the system along with a number of other documents. Based upon this detailed consideration of

the proposed system, the panel advised HUD that, in its opinion, the system was probably quite safe; but that there remained a sufficient number of

questions to make some type of performance testing

prior to construction mandatory. The panel pointed out to HUD that full-scale field testing was one

possible solution to this problem. The recommendations was for full-scale laboratory testing of a module of the proposed building system. The choice

of laboratory testing as opposed to field testing was based on the fact that HUD was particularly

anxious to make housing available to the people of

Detroit and time was of major importance. The

laboratory test made it possible to determine the

behavior of the building system in a minimum of

time.

Figure 2 shows the structural components which were used in the building system. These, however,

are not the whole structure; the structure consists

of these precast components, along with the

in-filling gypsum walls which are an integral part of

the overall system. So. in our laboratory we

erected, not only the precast components, but also

the in-filling system.

The question which was raised was: Is the

system structurally adequate? It had new materials;

it used different construction techniques; it had in- novations; and it definitely had code departures.

The ACI Code, for example, has minimum column

sizes which are far in excess of the column sizes

which were used in the Mitchell System. The inter- connection of the cast-in-place slab, which you will

Figure 2. Assembled precast structural components. see shortly, was a departure from the allowable

code spacing of shear connectors. The inserts were

wider spaced and they were not of a type that is generally considered to be covered by the present

codes.

What are the structural performance criteria upon

which one judges a system? One is safety; the other

is serviceability. By safety we mean reliability

against collapse; that is, against killing someone. In

the case of serviceability, we are concerned with

the static stiffness of the structure, or does it deflect i too much as you walk across it? What is its dynamic ' response? When you walk across it do you get a

feeling of motion? And finally by serviceability we : also mean freedom from distress. As this building I system is in service, do you have cracking?; do you

have evident signs that something is amiss, spalling. etc.? From the standpoint of structural safety, we tried f to set down what we felt were some detailed per- formance requirements, the state of the art in the i area of performance requirements is not perfect by ' any means. What we did was to look at existing ' building codes, at existing practice, and we asked '
PERFORMANCE TESTING OF A LOW-COST HOUSINCi SYSTEM 51

ourselves what are we doing today with our present

conventional buildings; what are we asking these

buildings to do? We have had experience with

these; and from this experience can we come up

with a set of requirements that we can set down and

use as a basis for evaluation?

Table 1 is an abbreviated list of the performance

requirements that were set down: First, the structure had to have a certain safety with respect to

floor loads. The particular values that are listed. 1.5 dead plus 1.8 live, are fairly well recognized in existing codes. These are not the exact numbers but

generally they are in this range. We have had the ex- perience which shows us that if we design a system

which will have this sort of capacity it will behave

reasonably well. Again, with respect to wind load, we do not have any good performance requirements

related to wind load; but most designers have found

that if they design with 0.9 dead and 1.1 wind load

they will have a structure which will perform

reasonably well. The values for wind loads were

magnified by 25% to account for possible variations

in the strength of the test structure.

j Floor Loads

Wind Loads.

I

I D Service Dead Load (40 psf= 1915 newton/meter^)

! L Service Live Load (80 psf=3830 newton/meter^)

j H Service Wind Load (20 psf= 958 newton/meter^)

I f Length of Member

1 building such as the Phoenix Project in Detroit

, which is only going to be three stories. So we talked

! to a number of consultants who have been daring in

t their designs and they indicated to us, that in high

1 rise buildings, when they design for story drift in exI'jcess of approximately h/500 they get complaints

i] (h/500 is a measure of story drift where h is the

, story height). People notice that their martinis slosh

fj around in the glass and they get visible tides in the

,i bathtub. These designers then have set a rule of

I thumb for high-rise buildings by which they limit the story drift to h/500. We did not have anything

better to use for the evaluation of this particular

ji system. So we set h/500 as our criterion. I guess in

ija way this paper is sort of a plea for additional

Table 2 gives an abbreviated list of performance

requirements related to serviceability. This list doesn't cover all of the things which were considered, but it does indicate some of the items which we were looking at. For floor loads, we have found

that, if we design a floor system so that it does not

deflect more than 1/360 of the span we end up with

a reasonably satisfactory structure. However, this //360 takes into account just the bare structure without the stiffening effect of non-structural ele- ments. We had to be a little more conservative

when we started dealing with systems, so we compromised on the //480 for the deflection requirements for the floor under one dead and one live load. Another requirement that we usually put on a system when it is field tested is recovery. We

usually require that there be reasonable recovery

and therefore felt that 75 percent recovery of the

deflectance was a reasonable value to expect for a system.

Finally, it is necessary to set some criterion with

respect to wind load deflection. There is not any

valid criterion available to us forjudging a low-rise

h Height Above Grade (Ground Level Outside of Building)

dv Vertical Deflection

dh Horizontal Deflection (drift)

research which will lead to a better set of per- formance criteria. I am giving to you now the per- formance criteria which we used in evaluating this system. These are not what we should be using;

they are just the best that we have available today

within the present state of the art. Figure 3 shows the components arriving here at the Bureau grounds, ready for erection; the precast

channel elements down below, the precast structural elements piled on top.

Figure 4 shows the structural model that we

tested. 1 call this a model because, even though it's full-scale, we were still modeling the overall per- formance of the building, as it would be erected in the field. The model was one story in height, two

Performance Requirements

Table \. Structural Safety Table II. Structural Serviceability

1.25 (1.5D+ 1.8L) 0.9D + (1.25)1.1H

P'oo-- Loads at D+L dv^ —

Wind Loads at 0.9D -I- 1 . 1 L '^'^ ^ 5^

Symbols: Table 1 and 2
52 PERFORMANCE OF BUILDINGS

Figure 3. Components for test structure.

bays in width and one bay in depth; This represents

a typical element from a three-story building. This

would be repeated several times; three times verti- cally in a three-story building and a minimum of two

times in depth in a typical building. The reason that we selected this element was that it represented a

typical lower story module of the system to be

erected in Detroit. We wanted to have a representative section of the structure and to have in it one beam unsupported by any of the in-filled walls

because this was judged to be possibly the most

critical part of the entire structure.

Figure 4. Test structure before installation of walls.

In Figure 5 we see the completed full-scale test model with the in-fill walls in place. The scaffolding

that you see on the inside was merely a safety

precaution because we had to get into the building

during the testing.

Figure 6 shows the building after erection of the

test frame. Note the wide flange steel beams which

were used to provide reaction against the test strucCONCEPT AND MEASUREMENT

Figure 5. Completed test structure.

Figure 6. Test structure with test frame installed.

ture. The members in front of the test structure pro- vide reaction for wind loads. A somewhat better view is obtained in Figure 7. We loaded this test structure in the following manner: wooden boxes were used to provide the

reaction against the floor load, which was applied

by plastic air bags placed between the wooden

boxes and the structure. By inflating these we could

provide a very uniform distributed floor load on top

of the structure. Note the vertical jacks which simulated the loads which were coming from the two sto- ries above, to simulate completely the behavior of: a three-story building. Horizontal rams were used

to simulate the wind load. These rams provided not only the wind load that would be applied to the lower story, but all the wind loads that would be ac- cumulated and brought on down from the upper stories. \ The instrumentation which was installed on the structure is shown in Figure 8. As a laboratory test." we had the liberty of installing a great deal more in-a
PERFORMANCE TESTING OF A LOW-COST HOUSING SYSTEM 53

Figure 7. Top view of test assembly. Figure 9. Test in progress.

strumentation than would ever be possible in the

field. We were able to install a total of 130 auto- matic recording instruments on this structure —

a

number that would not necessarily be impossible,

but prohibitively expensive and difficult to install in the field. Figure 9 shows a test in progress. Note the auto- matic data acquisition equipment which made the

whole test sequence very rapid. We were able to carry out all the tests on the system in a total of six days.

Now. getting back to the requirements. We set a requirement that, under a floor load of one dead and

one live the vertical deflection could not exceed the

span divided by 480. And. we had to have a 75 per- cent recovery.

We see this performance requirement graphically

presented in Figure 10. The ordinate is Floor Load

in pounds per square foot; the abscissa is vertical

deflection. Note that we have a broken scale.

In Figure 10 we see then the performance of the

actual building. The first part of the response curve

is deflection under the application of the vertical loads from the two stories above. These are the

column loads coming down from above, and we did

experience some column shortening. Actually, this deflection should be excluded from our per- formance requirement, because, normally, when we

set up a requirement of //480, we are concerned

about the deflection of the floor itself. Beyond this

initial stage the structure responded linearly. We

had other performance requirements, as I have

mentioned earlier, which required that we go to considerable higher loads during this test. The

load was held for 24 hours, and then unloaded.

After unloading the structure was allowed to sit for another 24 hours. We got a considerable amount

of recovery. Note that the structure more than

100^ ID+2L 24 HRS

0.00 0.05 0.10 0.15 VERTICAL DEFLECTION (in.)0.30

Figure 8. Partial view of instrumentation on test structure. Figure 10. Performance of test structure under vertical load.
54 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

satisfied the performance criterion. It deflected

about eight-hundredths of an inch, whereas thirtyhundredths of an inch would have been acceptable.

The next serviceability requirement which I would like to discuss concerned the response of the

system to full wind at 0.9 dead load. You may well

ask. "Why do you use 0.9 dead, rather than full dead?" The reason for this is that it has been our ex- perience with building systems that they deflect more under small dead loads than they do under

higher. The smaller the vertical loading usually the

larger the lateral deflection, because the vertical

loading tends to stabilize the system. Then, why the

0.9? Well, it is conceivable that you might have as much as 10 percent of the design dead load missing

from the structure. This is quite possible even in the

Mitchell System, where a part of this dead load is made up of partitions that will not always be in- stalled, or floor coverings not always in place. Thus,

our requirement was for a story drift (story drift is described as the horizontal movement of one floor

relative to the other) equal to or less than one

five-hundredth of the height of the story. This per- formance requirement is shown graphically in Figure 1 1. Note the response of the test structure.

It sustained a considerably higher load level than

required and recovered very well. The structure was well on the safe side of its allowable per- formance.

400 -

0.0 0.1 0.2 0.3 0.4

HORIZONTAL TRANSLATION (in.)

Figure 1 1. Performance of test structure under wind load. Now, going on to the structural safety requirements (see Figure 12): for floor loads the structure was required to resist an ultimate load of 145 psf,

derived from the performance requirements for

structural safety, shown in Table I. This was in our

300-

tro

o

200 -

100-

0.6 1.0 VERTICAL DEFLECTION (iN.)

1.5

Figure 12. Ultimate strength of test structure under vertical load.

judgment the best estimate of the maximum possi- ble load which such a system should be expected to

resist. In reality this is a very stiff requirement in that it is equivalent to 240 normal weight people in the 12x20 foot livingroom of this building.

Although this may be far too high, we just do not have the necessary basis for sharpening up these

requirements at this time.

The requirement, then, was that the floor must

carry about 145 pounds per square foot. Actually, we loaded the floor up to 360 pounds per square

foot and the structure did not fail. At this point our

loading system reached the limit of its capacity so we had to discontinue the test. At this extreme level of loading the structure was still in surprisingly

good condition and showed reasonably good

recovery upon removal of the load. Let me describe

to you what the structure looked like at this extreme

loading. There was a fair amount of cracking in some of the beams; there was no distress in the

columns; and there was no distress in any of the

partition walls. The structure, undoubtedly, could

have carried a fair increment above this load. Another strength related performance requirement which was mentioned earlier is resistance to wind. Figure 13 shows the results of this test. This

criterion required that the system not collapse at a load of 0.9 dead plus 1 .4 wind.

The structure was capable of resisting a load of

3 H or 60 pounds per square foot — three times the

design wind load. As was the case for the floor load

this test was also discontinued before failure was

reached. A simple check of statics on the structure indicated that it was reaching the point where it was

about ready to roll over. If we had loaded it up to about 80 pounds per square foot it would have

simply turned over as a box since it would not have
PERFORMANCE TESTING OF A LOW-COST HOUSING SYSTEM 55

80

in

o. O

O

z% 20

3.0 H WALLS IN PLACE

-

1.4 H /

/ WALLS REMOVED ,

0.0 0.1 0.2 0.3 0.4 0.6 0.6 HORIZONTAL TRANSLATION (in.)

Figure 13. Ultimate strength of test structure under wind load.

had enough vertical load to resist more wind. The

structure was not held down in any way. The

system certainly had adequate capacity with

respect to wind load. One of the things that we gained from this pro- gram of tests was an appreciation for the difference

between system behavior and behavior of the

"structural" portion of the building system. We ran most of our tests on the total system. These were

the first tests which were run. After these were ex- ecuted we removed the walls to see what would

happen to the building without its walls,

j Figure 14 shows a plot of floor load versus vertij cal deflection for the mid-span of the central main

I beam in the structure, both for the total system and

also for the system with its walls removed. The

removal of the walls dramatically altered the per- formance of the system. Even though the walls were not under the beam in question the effective

stiffness was changed by a factor of approximately

I three. What happens in these systems is that, as you

stiffen up any part, it starts carrying more load, the

load being carried by the stiffer parts. This beam

was not experiencing anywhere near the load that a simple straight forward analysis would have in- dicated.

What about the influence of the walls with

respect to wind load? Figure 13 shows this aspect

* of the response of the structure. With walls in place

the system was perfectly satisfactory with respect

\ to the performance requirements that had been set

j for evaluatimg it. However, when the walls were

* removed we got a dramatic change in the per- jformance, because these walls were carrying the

major part of the racking loads that had to be re- sisted by the structure. As a result of this particular

uest it has been decided to add a note to the record

' drawings against the possibility of removal of walls

^ without the provision of adequate temporary brac200r

VERTICAL DEFLECTION (in.)

Figure 14. Effect of walls on structural response to vertical loads.

ing. The Mitchell System was designed in such a way that it took advantage of the presence of the

walls. Therefore, these are an integral part of the

overall structure and it would be a mistake to permit

the removal of all interior walls at any one time.

The results which I have reported thus far are concerned with the system as it was actually

erected in the laboratory. There were some dif- ferences between this laboratory model and the

original drawings pertaining to the system. The

concrete which was used was of a higher strength

and was also somewhat more dense than the concrete originally intended.

The erection of the test structure and all of the

testing reported upon here were all accomplished in a period of five weeks from the arrival of the components at the laboratory. Another three weeks

were required for the completion of the report

which was submitted to HUD, giving the evaluation of this system.

Full-scale tests of this type are fine, however,

there is a limit to what you can do with full-scale

testing. You cannot build a full-scale structure to

test out all of the things you might like to in- vestigate. Your judgment would tell you that there

are other things you ought to be looking at — for ex- ample, the long-term behavior of the columns in this building under load. Therefore, we proposed and

carried out a set of two column tests which are still under way, in which the columns are being subjected to a continuous load of one dead plus one

live. These are designed to see if there is any possibility that creep buckling could take place over a long period of time. In addition to this, we were

very much concerned with the interconnection used

to join the precast elements to the cast-in-place
56 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

slabs. Therefore, we proposed that a series of cyclic

load tests be carried out. We had the choice of

recommending a full-scale long-term test on the

structure. However, we felt that this test would be

prohibitively expensive. We also had the choice of

recommending that a full-scale cyclic test be carried out to see how the connectors would behave under

repeated load. In our judgment, it seemed that this was the type

of information that could best be gained from component tests. Thus, we proceded with these component tests. In Figure 15 we see one of these component tests

in progress. This test specimen represents the center precast beam along with a portion of the

cast-in-place topping slab which is placed on top of

it. These are interconnected by a number of connectors, similar to those which were proposed for the

construction in Detroit. The component requirement, which was set for this test, required the component to sustain one thousand repetitions of load- ing between one dead load and one dead plus one

live, without showing signs of distress. Figure 16 shows the results of the first test. These are the results on a beam, similar to that which was proposed for use in the construction in

Figure 15. Component test in progress.

TVPE1 INSERTS AT 19 ' NO COLUMN CONNECTIONS

BJ 30 - I

Figure 16. Component test on floor beam under cyclic

loading.

Detroit. What 1 have plotted here is the mid-span

deflection of the beam in inches, versus the number

of cycles. The performance criterion which was set requires that this beam must withstand one

thousand repetitions of loading from one dead to one dead plus one live, without experiencing any

deterioration or slippage. We found in this test that we had a slip which occurred during the application

of the first cycle of loading. This occurred at a load

of approximately one dead plus one half live, but a

similar slip did not occur in the total system test. Our question then was, Why didn't this occur in the

total system test? Well, we had selected a component for this test that appeared to be representative of the real system; but we had never attributed

any shear capacity to the column connection, which

is present on all these beams. It turns out that in the

real structure where you test the system you get this type of column connection; and that it apparently

makes the big difference in behavior. When we

went back and retested, this time with a column

connection using the same type of insert, we got

satisfactory behavior. The beam went through a thousand cycles at one dead plus one live load and

slipped when the load was increased to one dead

plus one and a half live. Thus, it was this column

connection which apparently made the difference.

This is one of the traps you can fall into with component testing. You single out what you think is a representative portion of the building, but it does

not take into account the very complex interaction

that is in existence in the total system.

We next tested a somewhat closer spacing for these connectors, using nine and a half as opposed

to the nineteen inch spacing which was used in the

earlier tests. We had better slip resistance under
PERFORMANCE TESTING OF A I OW-COST HOUSING SYSTEM 57

cyclic loading, and our recommendation was that

tlie closer spacing be used for these shear connectors.

It is interesting that the total cost for this per- formance evaluation was $40,000. This included

the erection of the test structure, its testing, the

development of performance criteria, and the

evaluation of the system. Total elapsed time was

eight weeks. Thus, it can be seen that laboratory

performance evaluation of building systems is both an expeditious and economical vehicle for assessing

the adequacy of innovative building systems. On

the basis of the laboratory investigation, which I have reported upon, the city of Detroit was able to issue a building permit. The construction is now un- derway.

SESSION IV. PERFORMANCE TESTING OF BUILDING COMPONENTS

B. C. Cadoff, Chairman

332-247 0 - 69 -5

PERFORMANCE TESTING -STATE OF THE ART

William R. Herron

Building Research Division

Institutefor Applied Technology

National Bureau ofStandards

"We are standing at the crossroads." You have

heard that expression many, many times. It is applicable today in two senses; first, we are at a cross- road this afternoon in the conference. For a day and

a half there has been discussion on performance

theory; now the subject changes to performance

testing — the process for establishing that a product

or system will meet user requirements. In the

second sense, the building construction industry is at a similar crossroad, since there have been

developed a number of general theories for and ap- proaches to building performance, but there still remains to be developed a complete set of per- formance standards and tests to validate the concept of performance-based specifications for building construction.

If the performance concept centers on the idea

that products, devices, systems or services, can be

described and measured in terms of a user's requirements, without regard to the physical characteristics, design, or the method of creation, then the

key to development of performance standards and

tests is the identification of significant criteria which characterize the performance expected.

Under the subject of performance testing, the in- terest is centered on the development of methods

for measuring how well the products, processes, or systems meet the significant criteria. The examples used to illustrate the difference

between the performance concept and the materials

concept invariably cite a finished product of some

sort for the comparison. If buildings in their completed stage had the mass production uniformity

of automobiles, electric razors, and household

appliances, then the comparisons would be valid. In building construction, however, there is the added

complication that each building is a unique assemblage of materials and components chosen (or

designed) to produce the desired performance for

that particular building. The manufacturer of a product makes design decisions initially and also

when he makes a change in model, but the manufacturer of buildings in effect produces a new model

each time. The same materials and components

may be used in building after building; yet, the total performance produced is unique for each building.

The large number of variables involved makes the

specifying of performance of buildings difficult. As

a result, there has been a tendency to specify

materials and products like those that have been

used "successfully" in the past, and combine them

in a manner which hopefully will result in the

desired performance of the completed building. One

significant factor to be considered in choosing the

material specification is whether the criteria selected will assure the desired performance. Even

more important may be the avoidance of unnecessary constraints which might result from the imposition of criteria that are unimportant to the per- formance expected. Once such constraints are established in specifications and codes, their

elimination involves much more than a simple

presentation of the attributes of the new in contrast

to the old, however logical.

The four speakers to follow this afternoon will discuss in detail the performance testing of some

portions of the totality which is called the building.

To set the stage for them, I will take a few minutes more to cover the generalities of performance test- ing, and tell you about some of the work that has

been started along these lines here at the National

Bureau of Standards.

Under the current system of materials specifying,

proof of compliance is accomplished by materials

testing rather than by evaluating adequacy of per- formance. Techniques must be developed for comprehensive testing encompassing complete

buildings. The relatively well-developed procedures

for testing of materials will reveal whether a materials specification has been met or not. Performance

testing however, has not been developed to the

point of providing such precise results, because of

lack of understanding of the extremely complex in- teraction between the performances of the con61
62 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

stituent materials and components that comprise

the complete building.

If user satisfaction is taken as the index of good

performance, and that satisfaction is defined as the

net subjective response of the user to the collective

performance of the elements which constitute the

buildings, then performance testing must measure

collectively or independently all of the influences

that contribute significantly to user satisfaction with

a particular whole building, sub-assembly or part.

Since the nature of these interactions is not yet fully

understood, recourse must be taken to the testing

of as complete and as complex a segment of the

building as practical. This can be done by full-scale testing of complete building sections, duplicating as necessary the building in use. Since the user cannot

judge or articulate meaningfully all of the required

performances, hidden and unexpected performance

interactions will become clearer through this type

of full-scale testing, just as they do in the course of use of buildings overtime. Potential problems, such

as the failure of reinforced concrete resulting from

electrolytic action between it and aluminum conduit encased in it, may not be discovered soon enough if performance testing is not done on the

assembly, even though each of the two elements in- volved met what appeared to be an appropriate

material or component specification. An example of

the interactions under discussion is the design consideration given to thermal control in buildings by

air conditioning. Thermal comfort is not dependent

upon temperatures alone — it is also influenced by

air velocity and humidity. Too high an air velocity can rob the body of heat and make the user feel cold. A similar feeling of cold can be induced in an

otherwise comfortable enclosure if the relative

humidity is greatly reduced. Of course the quality of

the thermal environment cannot be made satis- factory if there is an imbalance between the input

capacity of the air conditioning equipment and the

requirements dictated by the size of the enclosure

and the thermal insulation. We can, however, make

trade-offs over a wide range between the various

factors which combine to produce a satisfactory en- vironment, and achieve it in an almost infinite number of combinations. If other design considerations cause constraint on any of these factors, the

imbalance can sometimes be overcome by making

a trade-off between this constraint and the remaining factors to produce thermal comfort.

For further illustration, I will split performance

into two parts and call them quality and quantity.

Quality here is defined as the ingredient of per- formance which is inherent in the properties of the

material, whereas quantity is the ingredient of size or amount introduced by the designer of the building. As an example, the air door used in some commercial buildings illustrates innovative possibilities

inherent in the performance concept and particularly the division of performance into its quality and

quantity elements.

This innovation is not the result of performance

testing; there is no effective pertinent test program.

The innovative thinking that brought about the air door, however, would almost certainly have been

hastened by utilizing the performance concept.

Previously the concept of access, security and ther- mal protection has resulted in a solid door as the

solution. The air door was made possible by looking

at the total performance required. It was not until the benefit of increased access to a commercial

establishment was put in its proper perspective with

the other performance requirements that the

trade-off of increased thermal protection was considered. The access to the establishment was

enhanced in both its quality (no door to hinder

customers burdened with packages) and its quantity

(increased flow of customers). In the process, however, the quality of thermal protection suffered

greatly. To restore design balance, it was necessary

to increase the quantity element of the thermal protection. While a comparison of the costs and benefits in- volved in the use of an air door has proved favorable to its installation under some circumstances,

under others, for example residential construction,

the need for access is not so paramount that it should take precedence over the cost of increased

thermal protection.

Unfortunately, the identification of performance

requirements usually begins with an analysis of existing solutions, and will be prejudiced by those

solutions until the basic performance requirements can be put into proper perspective. It is only then

that the innovative possibilities can be fully exploited. I would like to quote from an editorial in the

October 12, 1962 issue of Science:

"The imaginative and original mind need not be

overawed by the imposing body of present

knowledge or by the complex and costly

paraphernalia which today surrounds much

of scientific activity. The great shortage in science now is not opportunity, manpower,

money, or laboratory space. What is really
PERFORMANCE TESTING — STATE OF THE ART 63

needed is more of that healthy skepticism

which generates the key idea — The Liberating Concept."

A sure way to produce a favorable environment

for the "Liberating Concept" is through the

performance concept.

The Building Research Division of the National

Bureau of Standards has taken a few steps in the new direction offered by the crossroads marked

"Performance Testing." This morning you heard

Dr. Pfrang talk about a scalar escalation of structural testing which permits simultaneous testing of

floors, ceilings, and walls of two full-scale rooms. In another project, tests were made combining both an

* increase in specimen size and a comprehensive se- ries of tests on the same types of specimens. These

specimens were typical wall sections found in home

construction, as prescribed for this series by the

sponsor. The Federal Housing Administration.

These wall sections, approximately 8 ft x 8 ft

(2.44m X 2.44m), were tested for structural, fire, rain and air infiltration, thermal, and mechanical

damage characteristics. Although this project was

a step in the right direction, more could have been

done in testing the same specimen simultaneously

for combinations of these characteristics and in more complex combinations of building components. This next incremental increase is what has

been proposed in a recent report to The Department of Housing and Urban Development on the

subject of a general application of the performance

concept to low cost housing.

I will sum it all up by saying it this way — we are looking for performance in building construction.

Performance, however, is meaningless taken out of

its environmental context. Performance testing restores that context. For example, screen doors

have a lot of good performance characteristics, but

performance testing would show that they fail to provide some of the more significant attributes ex- pected of a closure for openings in submarine hulls.

PERFORMANCE TESTING OF SANITARY PLUMBING FIXTURES

Paul R. Achenbach

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

The Need for Performance Criteria

Much emphasis has been placed on performance

requirements and performance criteria during

recent years, in seeking to describe the future course of the building industry. Performance is defined only as a noun in the dictionary, and has

several different meanings. It may refer to a theatri- cal program, the mechanical attributes of an au- tomobile such as acceleration, power, speed, etc., or in a more abstract sense, the ability to achieve a desired result. It is in this latter connotation that it

is currently being used by leaders in the building in- dustry; as an adjective modifier in terms such as performance requirements, performance criteria, or performance codes. More specifically, the concept

of performance of a building material, component,

or system is the ability of that building element to

fulfill the important requirements of the user, without regard to the materials employed in its construction. The adequacy of performance of the built element would typically be determined in the

laboratory by simulated usage tests. The use of performance criteria is not new. For

example. Proverbs 31, believed to have been writ- ten about 1000 B.C., lists the performance criteria for a good woman. An incomplete list of these

criteria reads as follows:

1 . She worketh willingly with her hands,

2. She bringeth her food from afar,

3. She riseth up while it is yet night,

4. She layeth her hands to the spindle,

5. She is not afraid of snow for her household,

6. She openeth her mouth with wisdom.

In a more contemporary frame of reference, the

fire endurance requirements for partitions, walls,

and floors in building codes have been expressed in performance language for many years. Specifications for air-conditioning units have stipulated cool- ing capacity requirements under standard test conditions, the ability to operate on over-voltage and

under-voltage and at high ambient temperatures,

and the ability to dispose of the condensate

produced by the cooling coil. On the other hand, a high percentage of the requirements in most build- ing regulations are expressed in specification-type

language for which selected materials or classes of

materials are identified, arrangement of parts are set

forth, or the physical and chemical properties of the raw materials or the elementary materials of construction are required to be within certain limits. Although the performance concept is not new in relation to the building industry, it has received

greater emphasis and has been broadened in scope

in the present-day analysis of building design, construction, and evaluation. Everyone is familiar with

the use of performance to describe the mechanical

attributes of an electric motor, an automobile, or an

airplane. However, the use of structural per- formance to describe how a complete building

withstands floor loading, wind forces, and seismic

disturbances without excessive deformation, vibration, or cracking; the use of durability performance

to describe how it withstands the deteriorating ef- fects of thermal expansion, solar radiation, rain, air contaminants, abrasion, and impact; or the use of

environmental performance to assess the thermal,

acoustic, illuminating, and spatial properties of an

enclosed space are less familiar concepts.

A number of factors in our industrialized society

have led to the need for evaluation of the per- formance of building components and systems.

First, a large number of new materials or combinations of materials have been developed for building

construction. The specification-type requirements

in present-day codes and standards cannot be used

to accept or reject these new products, and the

question immediately arises as to what performance

requirements were essentially satisfied by the more

conventional materials which can be used as measures of the adequacy of new materials. For the same reason, the gradual but inevitable replacement of field-assembly of the elements of a building

by factory-prefabricated assemblies of considerable complexity and variety has created a strong de- mand for new evaluation procedures. The promise

65
66 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

I

of greater economy in building, greater variety in materials and styles, and greater speed of erection

with prefabricated assembilies, has accelerated the

trend toward factory-assembly of components, even though all of these benefits have not been

proven as yet.

The rapid growth in the use of computers in building design has stimulated efforts to evaluate

the performance of building systems, because computer methods permit analysis of a larger number of

design variables, the study of more complex

designs, and a more rapid comparison of alternate

designs than was possible by earlier methods of

analysis.

Interrelationships in Codes, Standards and

Specification Development

In the United States, assurance of strength,

safety, sanitation, and health in building construction is usually provided by the requirements written

into legal codes. In contrast, the attributes of durability, capacity, efficiency, effectiveness, and

aesthetics are provided through specifications. In both cases, the determination of the adequacy of

these features in any given building is often deter- mined by reference to appropriate standards, where

these are available.

Contemporary codes and specifications employ

a high percentage of prescription-type requirements

that limit sizes, materials, and designs, and tend to

inhibit the introduction of innovation into building

practice and to incorporate fewer performance-time

requirements. This is regarded as a natural

state-of-the-art in building design and construction

at the present time for the following reasons:

1. Specification-type requirements are easier to prepare and to administer.

2. It has not been possible to write practical per- formance requirements for many building

components.

3. The test methods to support performance

requirements have not been developed in many cases.

4. The necessary laboratory facilities for per- formance tests are not always available.

5. Agreement has not been reached among in- terested parties on the performance levels to be required.

Let us look at the steps involved in the development of new test procedures for performance

evaluation, and in their incorporation into standards, codes, and specificaUons. Table 1 lists the

principal steps involved in this process.

Table 1. Steps to Performance Requirements for Codes and Specifications

1 . Identify performance characteristics'

2. Collect statistics on use conditions'

3. Determine physical, chemical, engineering

properties'

4. Develop test procedures for measuring properties

5. Obtain performance data on prototypes or stock models

(1) Understand technical properties

(2) Formulate test procedures

(3) Relate test procedures to functional

requirements

(4) Use as a basis for performance level'

6. Standardize test procedures'

7. Select performance levels for codes and

specifications'

The demand for performance requirements for a

building component may originate with a manufacturer, a government agency, a standards organization, or a consumer group. It often accompanies the

introduction of an innovation into commerce

because the existing methods of evaluation are not adequate for the new material or system under consideration. This recognition can lead to the

sequence of events illustrated in Table 1.

Example of Performance Criteria Development

The Building Research Division of the National

Bureau of Standards has participated in the

development of performance requirements for a number of building elements in recent years. Some

of the important factors in the process, as well as the difficulties in attaining the ultimate objective,

will be illustrated by describing our work on sani- tary plumbing fixtures. The request for this study was generated by the appearance on the market of

products that could not be adequately evaluated by

the existing criteria; viz, bathtubs made of

glass-fiber reinforced plastic. The study was sponsored by the Building Research Advisory Board of

the Nafional Academy of Sciences-Nafional

Academy of Engineering-National Research Coun-

' Steps in which cooperative judgment and action are important.
PERFORMANCE TESTING OF SANITARY PLUMBING FIXTURES 67

cil, and was carried out under the general direction

of a special advisory committee of the sponsor.

At the outset the performance characteristics of

a given product are likely to be expressed in qualitative terms related to different facets of the structural, safety, durability, environmental, or aesthetic

properties of the products without reference to how

they shall be determined or what limits shall be

used. This qualitative aspect is illustrated in Table

2, which lists the performance characteristics for sanitary plumbing fixtures that were identified by

the special advisory committee of the sponsor. This

committee included individuals from industry,

academic institutions, government agencies,

research organizations, and manufacturers' associations, in order to obtain the broadest spectrum of in- terests and viewpoints. In fact, experience indicates

that a similar consensus of views and judgements is important at several points in the total process of

developing performance criteria, as indicated in Table 2, if the results are to receive the desired ac- ceptance in commerce.

Table 2. Performance Characteristics for Sanitary

Plumbing Fixtures

A. Structural

Uniform loading

Concentrated loading

Impact loading

Local deflections

Drain fitting load

Watertight joint potential

Rim load

B. Thermal

Cracking and crazing

Maintenance of bond

Localized heat source

C. Mechanical

Surface inspection

Water absorption

Abrasion

Impact resistance

Dimensional stability

Maintenance of bond

Cleanability

Slip resistance

Scratch resistance

Drainability

D. Noise Control

Noise damping

Sound attenuation

E. Chemical

Household chemical resistance

Stain resistance

Color stability

Surface texture aging

Odorlessness

F. Biological

Micro-organism nutrients

Vermin resistance

Dermal toxicity

In order to provide quantitative performance

requirements or criteria for a product, tests must be

made to measure the properties of the product that most clearly represent these requirements. Thus,

having listed the desired performance characteristics in qualitative language, scientific personnel

must select those physical, chemical, or engineering

properties that can best be used to develop quantitative data on the product. Sometimes this process

is straightforward if recognized test methods al- ready exist. For example, the test procedures for steady-state heat transfer of walls are incorporated

in one or more ASTM Standards. On the other

hand, the properties of a bathtub that best define its cleanability or its ability to withstand dynamic load- ing are more difficult to appraise, partly because of

the lack of prior effort and study of these characteristics. Likewise, in the discipline of durability of

materials the relation among impact resistance,

hardness, abrasion resistance, and scratch re- sistance is not clear with respect to a given usage.

In a broad spectrum of performance requirements such as those listed in Table 2, it is easy to pick out a few for which there are generally-accepted test procedures available for reference and

use. For other characteristics, such as flame spread,

there is a recognized test method for wall and ceil- ing surfaces, but its scope may or may not logically

include sanitary plumbing fixtures. For still other

characteristics, such as impact resistance, cleanability, abrasion or wear resistance, and weathering

there are several standard test methods each ap- plicable to certain types of materials, products, or

uses. Thus, in any of these situations, the

paramount question becomes, how well does the

proposed or existing test procedure simulate actual

use? The exactness of simulation becomes especially critical when products for the same service

are manufactured from materials of widely different

properties. The difficulty of devising test procedures that are equitable for widely different

materials was clearly demonstrated in the study of
68 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

sanitary plumbing fixtures made of enameled cast

iron, enameled steel, and reinforced polyester resin. A corollary question is, what constitutes actual

use? Frequently, a field study of the conditions of use of a given product will yield valuable information and guidance on the following factors:

1. The relative importance of the different per- formance characteristics,

2. the important physical process pertinent to a given characteristic,

3. the adequacy of simulation represented by a given test procedure,

4. the severity of exposure in use or the range of

severity of exposure that is likely to occur, and

5. estimates of the probable useful life expected

or attained for the product.

Development of New Test Procedures

The number of performance requirements that are important to the user depends on the state of

development of the particular product under consideration and the degree to which the product or system interacts with the user's daily life or

represents a status symbol in his community rela- tionships. This can be illustrated by considering the

counterpart of the modern bathtub of one or two

generations ago in many rural homes, shown in Figure 1. Obviously, the drainability of this fixture was nonexistent for practical purposes. Likewise,

such aesthetic properties as stain resistance,

scratch resistance, sound attenuation, and color sta- bility were of little importance. Furthermore, this early bathing facility was not accessible or on disFigure 1. The modern bathtub of one or two generations ago.

play on a continuous basis for members of the family and friends as is the modern bathtub.

In the study of sanitary plumbing fixtures a number of new test procedures were developed and some existing procedures were modified to effect better simulation of the service expected of this type of product. Among the new and modified test procedures were those for dynamic loading,

hot-water resistance, resistance to localized heat source, scratch resistance, and drainability.

Figure 2 shows the equipment and apparatus

used for dynamic loading of bathtubs to simulate

the effect of a fall in the tub or ofjumping into a tub. The impact load consisted of a heavy leather bag

filled with 150 lb. of lead shot. The bottom of the

bag was 9 inches in diameter and was made of a sin- gle piece of leather without seams. It was supported

from a quick-release mechanism so it could be

dropped on a prescribed area of the bottom of the

tub from any height. It was found that some tubs were permanently deformed by dropping this load

from heights of 18 to 24 inches. However, a limited

field survey of similar tubs indicated that permanent

deformation of tubs from falls did not appear to be

a serious problem in actual use. Nevertheless, such

Figure 2. Apparatus used for application of dynamic loading of the interior of a bathtub.
PERFORMANCE TESTING OF SANITARY PLUMBING FIXTURES 69

a performance test is recommended to control the

installation of tubs of appreciably lower resistance

to this type of load. Figure 3 shows an apparatus developed for studying the scratch resistance of sanitary plumbing

fixtures by a hard, sharp object. A field investigation indicated that exposure to scratching was

prevalent because children played with toys in bathtubs and because sand was frequently in- troduced into a tub during bathing. This apparatus

consists of a modification of the Porcelain Enamel

Institute Gouge Test Apparatus [1] to make it suita- ble for a scratching test. A reversible motor drives

a screw shaft which slides the carriage across the

top of the elevating table at a constant velocity. A

specimen placed on the carriage is contacted from

above by a diamond scratching tool mounted on the

underside of a counterweighted lever beam. The

load on the scratching tool is calculated from the

I load on the beam and the lengths of the lever arms,

i A special viewing box which provides a uniform

i viewing distance and angle, and a uniform spatial

illumination, was used for evaluating the scratches.

It was found that the scratch resistance of the vari- ous materials used for sanitary plumbing fixtures

varied at least 40-fold using this test procedure.

i

f Figure 3. Modified PEl Gouge Test apparatus used for

ll investigating the scratch resistance of sanitary plumbing

1 fixtures.

Figure 4 shows an investigator measuring the

thickness of material that had to be abraded away

to remove the char and discoloration caused by a burning cigarette lying on the rim of a bathtub. The

cigarette-burn resistance test provided a rating that was related to the amount of rubbing or abrasion

required to remove the char or discoloration caused

by a cigarette under prescribed conditions.

Cigarette-staining of sanitary plumbing fixtures was

found to be moderately prevalent during a limited

field investigation.

Figure 4. An investigator measures the amount of material

that must be scoured away to remove the discoloration and

char caused by a cigarette lying on the rim of a bathtub.

Figure 5 illustrates the apparatus and equipment

used to evaluate the ability of a bathtub to withstand exposure of the interior surface to hot

water without blistering, cracking, checking, or loss of bond between surface coating and base material.

A grid of steam pipes equipped with suitable traps,

valves, and automatic temperature controls was immersed in a specimen filled with water to the over- flow outlet. Tubs were exposed to a variety of

Figure 5. Apparatus used for studying the effects of prolonged exposure to hot water on a bathtub.
70 PERFORMANCE OF BUILDINGS

operating conditions, ranging from 100-hour exposure to water at a temperature of 1 20 °F. Fiber-glass

reinforced polyester resin tubs were found to suffer

blistering and fiber-prominence after long exposure

to hot water, but further study would be necessary

to define precisely the performance requirements.

Collection of Performance Data

After suitable test procedures and apparatuses

have been developed, the performance of typical

products can be measured under selected test conditions. Here again the desirability of a

multi-discipline review of the adequacy of simulation of actual use represented by the test procedures is of the highest importance. Test

procedures can sometimes be devised to favor a

certain class of materials, and criticism of test procedures is not uncommon when the test results do not reveal desirable properties for all types of

specimens.

Prototype or development specimens of a product can sometimes be obtained on which to collect quantitative data. However, more frequently

proprietary products are the only specimens avail- able. There are a number of important benefits to be

derived from tests of contemporary products in ac- cordance with a comprehensive set of test procedures covering a wide spectrum of properties:

1. Such tests frequently provide a better un- derstanding of the technical properties of a product,

2. the tests often serve to improve the correlation between the test procedures and the

qualitative performance requirements,

3. tests of proprietary products usually generate a searching review of the test procedures by

the manufacturers and promote greater effort toward fairness on the part of the testing

agency, and

4. performance data on available contemporary

products usually comprises the only

adequate basis for the selection of per- formance levels. Examples of test results on contemporary

bathtubs related to dynamic loading are shown in Figure 2. Figure 6 shows the range of maximum

deflection of several specimens of cast iron, steel,

and reinforced polyester resin (FRPE) bathtubs

when subjected to the dynamic loading caused by

dropping the 150-lb leather bag loaded with lead

shot from different heights. The cast iron tubs were

I CONCEPT AND MEASUREMENT '

0 J 2 .3 0 .1 .2 .3 4 .5 ,6 7 8 0 I .2 .3 4 -5 J5 7 .6 CENTER DEFLECTION, INCHES

Figure 6. Concentrated load test (Dynamic), 150-lb. leather

bag. shown to be the most rigid, and the plastic fixtures

the least rigid, of the three types. As mentioned

earlier, some of the steel tubs permanently

deformed during this test for heights-of-drop in the

range of 18 to 24 inches. It was found that the

deflections caused by dynamic loading bore no consistent relationship to the deflections of the same

specimens caused by static loading at the same

point of load application. Thus, there appeared to be no simple way to simulate the effects of dynamic

loading by a proportional increase in static loading.

Figure 7 illustrates the effect of slope of the bot- tom of a bathtub on the time required to drain a

specified amount of water and on the amount of

water retained as a film or in pools. The principles

of orifice flow appear to govern the discharge when

the bottom of the tub has any appreciable slope. The

drainage of the last one or two hundred milliliters of

water appeared to be governed by the principles of

film flow, and there is always the possibility of poolSPECIMEN SC-I 11,840ml ADDED TO WETTED TUB

TIME, SECONDS

Figure 7. Bottom slope effect in bathtub drainage test, regime 2.
PERFORMANCE TESTING OF SANITARY PLUMBING FIXTURES 71

ing if the surface is uneven and the average slope is near zero. Table 3 shows drainage data on five bathtubs, some metal and some plastic, in which

98% of the test volume drained out in less than one

minute in every case, and the water retained on the

bottom surface was less than 100 ml in every case except for specimen PB-3, in which the bottom of

the tub had been roughened by a boiling test. Data of the kind shown in Figures 2 and 3 and in Table 3 are valuable in assessing the realism of

simulated test procedures; they provide new technical information on important performance characteristics of these products; and they provide a valu- able basis for the selection of performance levels.

Standardization of Test Procedures

Test procedures developed by a manufacturers'

association are usually promulgated with the intent

of making them standards of that particular industry

and for possible wider usage in specifications, contracts, etc. The test procedures typically become

Table 3. Results of drainability tests

Specimen material and

identification

Tangentdepth

volume ^

Time to discharge

98% tdv •

Volume

retained on bottom

surface

ml sec ml

Enameled steel (SC-1) 3,300 2 43.7 35

3 42.9 28

2 41.8 2 30

3 45.4 3 30 Enameled cast iron (CIA1) 8,600 20.2 18

19.2 18 19.7 15 FRPE (PC-4) " 10.710 14.3 44

15.5 38

15.4 41 FRPE (PB-3)^ 12,000 19.9 109

19.3 107

22.0 94 FRPE (PB-2) 12,000 23.9 67

25.0 84

25.1 72

' Tangent-depth volume,

^ Observer A.

' Observer B.

* Test made after completion of 100-hr boil test.

' Tangent-depth volume is defined as the volume of water required to fill the bathtub to a depth such that the water surface coincides with the point of tangency between the inside bottom surface of the bathtub and the curved area at the end

opposite the drain, as determined on the longitudinal centerline of the bathtub by

j| means of a straightedge placed on the bottom.

Standards of the association after review and ap- proval by an engineering committee or a standards

committee and after approval by the Boards of

Directors. The standardization process by national

standards organizations such as ASTM and USASI

typically requires one or more reviews by a broader

consortium of interests and requires more time for promulgation and approval. Agencies of the

Federal Government and the National Academy of

Sciences — National Research Council do not promulgate and issue standards, although the

Minimum Property Requirements of the Federal

Housing Administration are regarded by some people to have many of the characteristics of a standard

or code. However, these organizations do in some

instances publish reports that contain suggested or recommended test procedures or performance

requirements, and frequently bring these recom- mendations to the attention of national standardizing bodies for consideration in their usual

procedures.

There are a number of benefits that accrue from

the standardization of a test procedure, regardless of

the type of organization that developed it; namely,

1. standardization represents substantial agree- ment on measures of value, oftentimes by

parties in competition with each other or by

even more diverse interests;

2. the process of standardization offers a measure of assurance of objectiveness and comprehensiveness of the test procedure;

3. the promulgation and issuance of a standard

attributes the stature of the sponsor to the

standard; and

4. the issuance of a standard by a sponsor sets the stage for broad reference and use. One should not overlook the disadvantage of in- flexibility and inertia that is created in commerce if an approved standard is ill-conceived or if the or- ganizational machinery is not maintained for review

and revision of the standard as technology changes.

Selection and Implementation of Performance

Criteria

The final and most significant step in the develop>-

ment of performance criteria for building products

or systems is the selection and implementation of

performance levels for use in codes and specifica-
72 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

tions. The process for selecting performance levels on a broad basis has not been developed, for the

most part. Two procedures have been used, in the

main, for this purpose; namely,

1. field or market surveys of greater or lesser scope to develop data on what constitutes

typical use conditions, on what characteristics consumers consider important, and on

what users consider to be an acceptable useful life of a product;

2. employment of data from simulated usage

tests in the laboratory to select performance

levels that either upgrade, downgrade, or maintain the existing quality of a class of

products in current use. The first method would be prohibitively expensive and excessively difficult if one proposed to evaluate as many characteristics as were listed earlier in this report for plumbing fixtures. Furthermore, in many areas of performance, such as structural strength, fire safety, durability, etc., most con- sumers would not be sufficiently well-informed to express useful opinions. Likewise, in some in- stances there would be no available materials or products that would provide the desired per- formance levels in all the significant characteristics.

Thus, it appears that the second method

described above constitutes the more practical ap- proach to the setting of performance levels. It per- mits decisions to be made on the basis of quantitative data; it permits tradeoffs between stronger and

weaker characteristics of a given class of products;

it provides incentives for upgrading of the weaker

characteristics of a given product, and it assures

that there will be some available products that are responsive to the selected performance levels. This

latter process is very imperfectly practiced at the

present time, as is indicated by the events that have

taken place during the progress of the study of sani- tary plumbing fixtures and since completion of the

study.

The final report of the study prepared by the National Bureau of Standards was transmitted to the

special advisory committee of the Building

Research Advisory Board late in 1966 for review

and eventual inclusion in their published recommendations. The committee reviewed the recom- mended test procedures and adopted most of them,

while making small revisions to some and a very

few substitutions. The report [2] of the committee,

issued in February 1 968, expressed the opinion that many of the recommended test procedures were

complicated and costly to perform, and that the sug- gested levels of performance had not been correlated

with service performance and tended to represent

the lowest common denominator among the fixtures

tested. The Federal Housing Administration permitted

installation of a limited number of fiber-glass rein- forced polyester bathtubs on a trial basis about the

time the study was initiated, and issued directives

to their field offices permitting the use of these fix- tures about the time the actual testing program was

completed by the National Bureau of Standards.

During the course of the study, revisions of Commercial Standards [2,3] on fiber-glass reinforced

polyester bathtubs and shower units prepared by

the industry were adopted by the USA Standards

Institute under their existing standards procedure.

Conclusions

It is clear from the examples cited that the

process for implementing performance requirements for building components is not standardized, , but depends on a variety of economic forces and or- ganizational policies. Perhaps the simplest and most

expeditious method for utilizing newly developed

requirements is to incorporate them into purchase

documents. The extensive list of Federal and Mili- tary specifications in existence provide an effective j mechanism by which test procedures developed by

any organization can be put into use in commerce. The modification of model codes and legal codes

is a somewhat slower process and, in general, is only applicable to criteria involving strength, safety,

and health. The experience gained at the National Bureau of

Standards in the study of sanitary plumbing fixtures

described herein, and other similar studies, in- dicates the following conclusions regarding the

development of performance criteria:

1. The process requires several years to complete for any given product.

2. The application of multi-discipline judgement

is important at all major steps of the process.

3. Laboratory effort in several disciplines will typically be needed for the development of

test procedures.

4. The adequate simulation of use conditions is a key ingredient in developing test procedures applicable to widely different

materials.

5. Multi-discipline action at the point of imple-
PERFORMANCE TESTING OF SANITARY PLUMBING FIXTURES 73

mentation of performance criteria is a complex part of the process because it involves

contractual matters, whose prerogatives are unwillingly shared, in most cases.

References

Test for Resistance of Porcelain Enamels to Gouging,

Bulletin T-1, Porcelain Enamel Institute, Inc., Washington,

D. C. (1942).

[2] Performance Characteristics for Sanitary Plumbing Fixtures, Building Research Advisory Board, National Acad- emy of Sciences- National Research Council (1968).

[3] Gel-Coated Glass-Fiber Reinforced Polyester Resin Bath- tub Units, USA Standard Z121.1 (1967); USA Standards

Institute, N.Y., N.Y.

[4] Gel-Coated Glass-Fiber Reinforced Polyester Resin Shower

Receptor and Shower Stall Units, USA Standard Z 1 24.2 (1967) ibid.

PERFORMANCE TESTING OF EXTERIOR WALLS: AIR, MOISTURE AND

HEAT TRANSFER

Henry E. Robinson

Building Research Division

Institute for Applied Technology

National Bureau of Standards

Abstract*

An apparatus developed for making measure- ments of air, moisture and heat transfer through exterior walls is described and typical results from

tests conducted on four different types of walls is given and discussed.

The apparatus consisted of two boxes with provision for inserting an eight foot by eight foot sample

of an exterior wall between them with air and

moisture tight seals. The warm box, representing

the interior side of the wall, could be controlled over a temperature range of 75 F to 100 F and a

relative humidity of 40% to 70%. The apparatus was instrumented to permit measurement of temperature and humidity at different points on the

wall, air and water vapor pressure differences

between the exterior and interior sides of the wall,

heat flow measurements, air volume supplied to

either box and deflection of the wall. The test walls were constructed so that joints typical of the type of wall were included such as verti-

*Abstract prepared by the editors. The speaker did not submit

a manuscript.

cal joints with panel walls and wall/floor and

wall/ceiling joints in all walls. The behavior of the wall is important and must be

considered in the experimental conditions. For ex- ample, the amount of water deposited in the wall in the form of ice varied with the type of wall. Under

winter conditions the ice impedes the leakage of air and a wall with high leakage under summer conditions may show low leakage under winter conditions after sufficient time for ice formation.

Leakage tests were made with the wall to floor

joint sealed and then with the wall to ceiling joint sealed. The effect of this sealing varied widely with

the type of wall. Panel deflection depended upon pressure dif- ferences, movement of water and, in some cases, thermal effects. Humidity sensors are not satisfactory for measuring the accumulation of moisture in the wall

because of the difficulty or impossibility of placing

them in the correct locations. However, a method

was developed that permits the rapid determination

of the rate of accumulation of moisture in a wall

under any given conditions.

1

332-247 0 - 69 -6

75

PERFORMANCE TESTING OF EXTERIOR WALLS: STRUCTURAL PROPERTIES

Robert G. Mathey and Thomas W. Reichard

Building Research Division

Institute for Applied Technology

National Bureau ofStandards

1. Introduction

Earlier during the conference there was considerable discussion of the different terms related

to the performance concept of buildings; terms such

as performance criteria, performance standards,

performance codes, performance requirements,

performance limits, and performance characteristics. With regard to the testing of exterior walls

and with particular attention to their structural properties, the term performance characteristics is the

most significant of those related to the performance

concept. The reason for this significance is that in testing exterior walls the primary objective is to measure the behavior characteristics or per- formance of the walls under anticipated service

conditions.

Performance testing of exterior walls to deter- mine their structural properties is carried out for

basically two reasons. First, to determine if the

walls behave in accordance with prescribed criteria,

standards, codes, or other requirements. Secondly,

to determine the performance characteristics of ac- ceptable exterior wall systems for the purpose of

using this information as a basis for developing per- formance criteria, standards, and limits that may be

applicable to wall systems in general. This second

reason provides the subject for this presentation.

What are the desirable performance characteristics of an exterior wall system for residential structures? To what extent are the desired per- formance characteristics of housing components

based on rational design factors? We know that some types of exterior wall systems have gained ac- ceptance through usage over the years, yet their design could be altered somewhat and the wall

would still perform satisfactorily.

! As an example, critics of conventional construcI tion methods point out that the basis for using wood

2 X 4-in. studs at 16-in. on centers is tradition rather

than rational design.

Actually there has been a form of evolutionary

development in this type of stud wall. We still say

2x4, but today's 2 x 4 is only about 2/3 as large as the original. Through usage, which can be considered full-scale performance testing, it has been

determined that the performance of today's stud

wall is acceptable.

It is undesirable to wait years to determine if in- novations will perform satisfactorily in service. We

must be able to evaluate new constructions rapidly

and in the laboratory. In evaluating the structural performance of wall

systems a number of factors must be considered,

but the most important of these are strength and

rigidity.

For some constructions, strength may not be as important as the stiffness, since the maximum re- sistance to load may not be attained until the wall

has been distorted beyond a usable shape. Conversely, a construction utilizing brittle materials may

distort very little before failure. It is therefore important that performance requirements for structural components include both deformation and

strength limits. This is particularly true in considering the effect of deformation on joints, doors, windows, and wall finishes.

It has been generally assumed that the per- formance of structural components evaluated by a

test method simulating service conditions is comparable to their performance when connected into a structure. This assumption is not necessarily valid

for all wall systems, especially if we consider the

cellular type of wall construction typical of residential structures. Much of the inherent rigidity and

strength of this type of construction is directly at- tributed to the interaction between the various components. When the methods of connecting the components are faulty or inadequate, the strength and

rigidity of the structure is questionable even if the

component performance is more than adequate.

Performance testing of exterior wall systems with

respect to their structural properties will be illus- trated by using as examples two investigations car- ried out by the Structures Section at the National

Bureau of Standards.

77
78 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

In view of present accepted practice in this country in this technological area, common U.S.

units of measurement have been used

throughout this paper. In recognition of the position

of the USA as a signatory to the General Conference on Weights and Measures, which gave offi- cial status to the metric SI system of units in 1960,

we assist readers interested in making use of the

coherent SI units, by giving conversion factors aplicable to U.S. units used in this paper.

Length 1 in. = 0.0254* meter

1 ft. =0.3048* meter

Force lib. (Ibf) =4.448 newton

1 kip = 4448 newton

Stress, Pressure

1 psi=6895 newton/meter^

1 psf = 47.88 newton/meter^

Force per Length

1 kip/in. = 1.751 x 10^ newton/meter

*Exactly

2. Investigation No. 1 — Exterior Walls

The objective of the first investigation was to adapt or develop test methods suitable for the

laboratory evaluation of the structural performance

of exterior wall constructions such as would be

used in one and two family residential structures. In conducting this study, the performance characteristics of a selected group of representative constructions were measured for the purpose of providing guidelines for setting performance levels. In

general, load bearing walls were considered,

although some were suitable for curtain wall applications.

The characteristics which were selected for study were the rigidity, creep and strength under compressive, transverse and racking forces. The seven types of wall systems included in this investigation are as follows:

(1) Brick veneer frame wall [brick veneer— 1/2

in. Fiberboard — 2 x 4 studs, 16 in. o.c —

1/2 in. gypsum board].

(2) Sheathed wood frame with wood siding

[wood siding— 1/2 in. Fiberboard — 2 x 4

studs, 16 in. o.c — 1/2 in. gypsum board].

(3) Furred masonry [4 in. brick — 4 in. block —

1/2 in. gypF^um board].

(4) Aluminum faced sandwich [0.02 in. aluminum skin — 3 in. paper honeycomb — 0.02

in aluminum skin].

(5) Plywood faced sandwich [ 1/4 in. plywood —

2

1/2 in. foamed polystyrene— 1/4 in. plywood].

(6) Prefabricated steel frame with plywood sid- ing [3/8 in. plywood— 18 ga. galv. "Z" studs

at vertical edges and center — 2 in. fiber- glass— 1/2 in. gypsum board].

(7) Unsheathed wood frame with a 1 x 4 let-in diagonal brace and aluminum siding [0.019

in. aluminum siding— 1/2 in. foamed polystyrene— 2 X 4 studs, 16 in. o.c— 1/2 in. gypsum board].

It can be seen that these seven types of wall

systems cover a wide range of constructions.

These seven exterior wall systems were subjected to the following three types of structural

tests:

(1) Compressive test

(2) Transverse load test

(3) Racking load test

Compressive Test The purpose of the compressive test was to deter- mine the performance of the test wall panels under

an axial compressive load. Compressive loads in service are produced by the weight of the roof,

second story walls and floors, building contents and

occupants, and snow and wind loads on the roof. The test specimens were 4 ft wide, 8 ft high, and were tested as recommended in ASTM E-72, Stan- dard Methods of Conducting Strength Tests of

Panels for Building Construction. The sheathed and

unsheathed wood frame wall panels were constructed by laboratory personnel. The prefabricated

wall panels were obtained commercially and were

tested as received after attaching 2x4 plates to the

top and bottom in order to provide for application

and distribution of load. Single specimens of each

of the seven types of wall constructions were tested

although it would have been preferable to test at least three specimens of each type. The load was

applied over a line one-third the structural thickness

from the inside face of the structural portion of the

wall.' The measurements conducted during the tests were the shortening of the walls, the shortening set, the mid-height deflection and the deflection set.

'The structural thickness was taken as the width of the studs ( in the wood, steel-framed, and brick veneer wails; the actual thickness of the sandwich walls; and the thickness of the masonry in the furred masonry walls.
PERFORMANCE TESTING OF EXTERIOR WALLS: STRUCTURAL PROPERTIES 79

Transverse Load Test The purpose of the transverse load test was to evaluate the strength and rigidity of the wall panels

in resisting a distributed load on the exterior surface. This type of loading is caused by the wind act- ing on the exterior face of the wall. The reverse of

this loading which was not carried out in these tests

is caused by the negative pressure on the leeward

side of the structure. Two types of transverse load test were carried out on single specimens for each type of test. In the

first, the 4 x 8 ft wall panels were tested simply sup- ported in flexure with bending taking place along

the length normally considered the height of the

wall. Two symmetrically placed loads were applied

to the exterior face of the wall panels at the quarter

points over a 90-in. span. Deflections at midspan

were measured and in general the tests were carried out in accordance with the requirements of ASTM

Standard E-72.

The second type of transverse test was one

developed at NBS. In this test the 8 x 8 ft wall

specimens were tested in a chamber under a uniformly distributed load with the edges

restrained. The chamber was basically a large box

with an open front against which the specimen was

placed with the exterior of the wall facing inward.

The open front was framed with steel channels to provide a stiff frame for the specimen. Loads were

applied to the exterior face of the wall by pressurizing the interior of the chamber. The load was deter- mined by measuring the chamber pressure with a

precision manometer. Loads of up to 50 psf could

be applied to the wall panels. A 50 psf load cor- responds to the force resulting from a wind of ap- proximately 1 10 mph. Deflection and deflection set of the wall specimens were measured at 1 3 different

locations. Data from this second type of transverse

test are not presented. However, these data were

considered in determining the recommended per- formance limits reported in the paper.

Racking Load Test

The third and final test was the racking load test. The purpose of this test was to evaluate the re- sistance of a wall to a latcTal end thrust applied near

the top of the wall. This end thrust in service is usually considered to be that caused by the action

of wind on a connecting wall at right angles to the

wall in question. A similar end thrust might also be

caused by earthquake forces.

The test specimen consisted of a nominal 8 x 8 f

t

portion of the wall complete with exterior and in- terior finish materials. All parts normally required

when fastening the wall to a structure were in- cluded. When applicable, the recommendations of

ASTM E-72 (Standard Methods of Conducting

Strength Tests of Panels for Building Construction) were followed in the fabrication of the test specimens.

A proposed NBS diagonal compression test method illustrated in Figure 1 was used for the

racking test in lieu of the ASTM E-72 method. The

apparatus consisted of a loading yoke, a displacement measuring gage, and a lateral support system

to prevent lateral movement of the specimen during

test. Basically, the loading yoke was a hydraulic

jacking device suitable for applying a compressive

load between the diagonal corners of the wall, and

included a load measurement device. The displacement measuring system was used to measure the

change in length of the diagonal. The lateral support was provided by a system of steel brackets and

heavy-duty casters. All walls were tested horizontally for convenience. The brick veneer and masonry walls were not tested in this investigation. Data

from previous studies were utilized [1], [2], [3]. Additional apparatus was designed so that the

performance of the exterior wall systems could be

evaluated under combined compressive and racking

loads. The compressive loading apparatus consisted

of a series of springs and tie-bar yokes shown in Figure 2 that were suitable for applying and sustaining compressive loads up to 2000 lb at each of five uniformly spaced positions on the walls. The

spring-yoke assembly was made so that it did not

physically interfere with the diagonal racking load

equipment.

After applying the predetermined compressive

load, the testing procedure was to build up the

racking load to the required increment, hold the

load for 10 seconds, make the displacement measurement, then release the load. Ten seconds after load release, the displacement reading corresponding to zero load was taken. These 10-second waiting

periods were considered to be more important than

the loading rate in determining the permanent set which is caused by time-dependent creep. The determination of the failure load for some

wall systems was not obvious. For most cases the

usual criterion is the point at which the load falls off while continuing to strain the specimen at a constant rate. For the sheathed wood wall frame, the
80 PERFORMANCE OF BUI LDINGS — CONCEPT AND MEASUREMENT

\

Figure 1. NBS Diagonal Racking Test Method.

plywood-faced sandwich, and the steel framed

walls, the rate of strain near the failure point greatly

influenced the maximum load. An attempt was made to prevent an increase of the straining rate as

the specimen started to yield.

Results

As expected from tests of these walls having considerably different properties, the results covered

a wide range of values. From a brief look at only a

portion of the data some comparisons can be made

of the performance of the wall systems.

In the compressive test, the maximum compressive load applied to a 4 ft width of wall ranged from

1 2.4 kip for the steel frame to 2 1 2 kip for the furred

masonry wall. Maximum compressive loads

sustained by the other 5 types of wall panels along

with the type of failure are given in Table 1

.

In the transverse test. Table 2, the maximum load

applied to a 4-ft width of wall ranged from 4 1 psf for the furred masonry to 329 psf for the sheathed

wood frame. The midspan deflection at 25 psf

ranged from 0.01 in. for the furred masonry to 0.31

in. for the unsheathed wood frame. Values for midspan deflection corresponding to a load of 50 psf are

also given in Table 2. From the racking test data presented in Table 3,

it can be seen that the maximum horizontal racking

load on 8 X 8-ft wall panels varied from 3.5 kip for the aluminum faced sandwich wall panel to over 50

kips for the brick veneer wall. It was difficult to evaluate the racking strength of the aluminum faced

sandwich wall because failure occurred in the con- nections; the sheet-metal screws were torn out of

the aluminum skins at very low racking loads. However, when this type of wall is used in a structure it
PERFORMANCE TESTING OF EXTERIOR WALLS: STRUCTURAL PROPERTIES gl

Figure 2. NBS Combined Compressive and Racking Test Method.

Table 1. Compressive Test Data

(Strength and Type of Failure)

Wall type

Maximum

load for a

4-ft width

of wall

Type of failure

Kip Brick veneer 22.2 Rotation of top plate about

inside face of studs. Sheathed wood 41.8 Fracture across grain of both

frame. end studs at knots. One end

stud split. Furred masonry ... 212.0 Face shells of 4-in. back up

units crushed in top course. Aluminum faced 12.5 Inside aluminum skin buckled

sandwich. near top. Plywood faced 72.1 Inside plywood skin buckled

sandwich. near top. Steel frame 12.4 Steel Z-studs buckled near bottom plate. Unsheathed wood 23.6 Excessive buckling of wall. frame. No permanent damage ex- cept stud indent in top plate.

appears to perform adequately because of the rigidity offered by the framing at the top and bottom of

the wall.

It will be recalled that the primary objective of

this study was to determine the methods of test that are necessary to evaluate the performance of exteri- or wall systems for one and two family residences.

With regard to structural properties, the compressive, transverse, and racking strengths and related

deformations and deflections were selected as the

most important performance characteristics.

ASTM E-72 test methods with modifications in some cases, along with NBS proposed test methods, were found to be satisfactory in evaluating performance of the exterior wall systems.

Recommendations

Based on the limited data resulting from this study and data from other investigations [3]. [4], [5] that substantiate in part the test results, the following performance limits were recommended.
82 PERFORMANCE OF BUI LDINGS — CONCEPT AND MEASUREMENT

Table 2. Transverse Test Data, Quarter-Point Loading of 4-ft Wide Wall Panels '

Wall type

Midspan

deflection at

25 psf 50 psf

Permanent

set for 50 psf

Maximum

load Method of failure

Brick veneer Sheathed wood frame Furred masonry Aluminum faced sandwich. Plywood faced sandwich...

Steel frame Unsheathed wood frame.

psf

0.10

.01 .21 .19

.14

.31

0.20

.43 .36

.24

.56

0.05

.03

.06

.17

319 329

41 139 287

163 211

Fracture of studs. Do. Bond failure of header courses in block. Sudden shear failure of panel near one support. Sudden fracture of edge piece near load point and fracture of tension-face plywood.

Steel studs slowly buckled at load points. Sudden fracture of one edge stud.

' Concentrated loads were converted to equivalent uniform loads. ^ From curve extrapolated to zero load. Table 3. Racking Test Data {Rigidity and Strength) for 8 x 8-ft Wall Panels '

Wall type

Rigidity -

At load of 3000-lb At dis- placement

of 0.2 in 5

Maximum

load

Type of failure

At initial indication of failure Final failure

Kipjin. Kipiin. Kip Brick veneer

Sheathed wood frame.

Furred masonry

Aluminum faced sandwich.

Plywood faced sandwich

Steel frame

Unsheathed wood frame.

130.0

1800.0

246.0

30.0

15.6

24.4

240.0

31.8

18.4

15.2

21.8

50. -h

9.7

46.4

3.5

11.0

4.8

7.0

Plaster cracked at displacement

of 0.46-in. Cracking of taped joint of plaster board at average horizontal load of 6.3 kip and displace- ment of 0.23 in. Diagonal crack between load

points in mortar around masonry units. Buckling of aluminum connecting angles at panel, joint, top and bottom.

Differential movement between

panels.

Differential movement between

panels, joint cracked.

Buckling of aluminum siding over let-in brace.

Did not fail at reported

maximum load. Diagonal crack in fiber- board sheathing across

corners.

Same as initial.

Crushing of corners at load point.

Crushing of wood at shear-pin holes.

Splitting of 2 X 4 in. top and bottom plates, and

enlargement of shear-pin holes in studs. Fracture of let-in brace. No distress in plaster board or taped joint.

' Loads and displacements are the horizontal equivalents of

the measured diagonal values. ^Rigidity is the measured load divided by the displacement

at that load. ^No interior finish.

( 1 ) The allowable compressive load should not exceed 50% of the least-strength- for flexible

construction and 40% for construction of unrein-

^ Least-strength is the minimum value determined in tests of

at least three specimens.

* 3000-lb. is a typical design racking load.

^ FHA Technical Circular No. 12 requires a minimum rigidity of 6 kip/in. at a displacement of 0.2 in. for a sheathed 2x4 stud

wall without interior and exterior finish materials.

forced brittle materials.

(2) The allowable racking and transverse loads

should not exceed 60% of the least-strength for '

flexible constructions and 50% for constructions of

unreinforced brittle materials.
PERFORMANCE TESTING OF EXTERIOR WALLS: STRUCTURAL PROPERTIES 83

(3) The lateral deflection at mid-height of the

wall under the design transverse or compressive

load should not exceed 10% of the structural thickness of the wall.

(4) The shortening of an 8-ft. high wall under the

design compressive load should not exceed 0.25 in. (5) The horizontal displacement along the top of an 8-ft. high wall when under the design racking

load should not exceed 0.20 in. (6) The permanent set resulting from any type of

loading should not exceed 50% of the allowable

maximum deflection or displacement.

The values given in the recommended per- formance limits were based on a factor of safety for strength properties, and on limiting values of deflection and deformation with regard to the opening and

closing of windows and doors, cracking of interior

wall finishes, and water penetration of exterior

walls. Based on typical design loads, the walls

tested in this study met the requirements of the

recommended performance limits, with the following two exceptions.

The allowable transverse load on the furred

masonry wall was only 20.5 psf and excessive

deflection of the unsheathed wood-framed wall

would be expected for wind loads exceeding 25

psf.

3. Investigation No. 2 — Masonry Walls

The second example of performance testing of

walls is an investigation recently carried out at NBS

regarding strength and rigidity of masonry. In

selecting the performance characteristics to be stu- died, the behavior of masonry walls in vertical and

horizontal flexure under lateral loading, compression, and racking were considered most important.

In addition, the effect of compressive vertical loads on these characteristics was considered to be

worthy of study.

i; Combined Compressive and Transverse Load

Tests

In one phase of the investigation, the compressive and transverse load test methods of ASTM

Standard E-72 were combined in order to in-

^ vestigate the effect of compressive vertical loads on

the flexural strength of the wall panels. In these

tests a predetermined compressive vertical load

i

was applied to i;^e wall panel with a hydraulic test- ing machine and then a uniformly applied trans- verse load was applied using a reaction frame and

an air bag.

Approximately eight specimens of each of eight

wall constructions were tested in the test setup il- lustrated in Figure 3. From these tests information

Figure 3. Combined compressive and uniform transverse

load test on a 4 x 8 ft masonry wall. The uniform transverse

load was applied by means of an air bag attached to the steel reaction frame on the opposite face of the wall.

was provided which allowed construction of in- teraction diagrams that represent the combinations

of axial thrust and moment which result in failure of

the walls. A typical interaction diagram for a brick

wall panel 4-ft wide and 8-ft high is shown in Figure

4. It can be seen from this figure that the wall panel

resisted considerably greater uniform transverse

load when a compressive vertical load was applied

to the wall. Maximum flexural stress was developed

from a transverse load when the compressive load was approximately 40 percent of the compressive

strength of the wall. In another phase of this study the effects of the
84 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

4000

4000

FLEXURAL STRESS, PSI

Figure 4. Typical interaction diagram for 4 x 8 ft bricic wall panels representing the combinations of compressive stress and flexural stress that resulted in failure.

height-to-thickness ratio and eccentricity of load were investigated by testing masonry walls that ranged from 10 to 20 ft in height.

Racking Load Tests

In carrying out racking tests of masonry the objectives were to develop methods of test to evaluate

the performance of masonry under racking forces,

to provide data in order to develop a rational ex- planation of the behavior of walls subjected to racking forces, and to provide data necessary for

recommending stresses needed for design purposes.

For this phase of the investigation wall specimens were tested in a number of different ways; loaded

across the diagonal with and without superimposed

vertical load, loaded horizontally along the top of

the wall while subject to vertical loads, and tested

in a manner similar to that described in ASTM

E-72. Instead of vertical tie down bars, a hydraulic ram was used as a reaction on top of the wall to prevent overturning. The movements and deformations were measured electronically and were auto- matically recorded. The effect of specimen size, the

effect of the aspect ratio of the specimen, the effect ' of the magnitude of the superimposed vertical loads on the compressive and racking strength were considered in determining the performance characteristics of the wall panels.

4. Conclusions

In summary, the performance testing of walls

requires the measurement of the behavior of the

walls under simulated service conditions. The important performance characteristics must be

identified and measured. Methods of testing to pro- vide simulated service conditions need to be used

or developed if they do not exist. Instrumentation

is needed to record the movements, deformations,

deflections, and any other measurements that are necessary. Finally, there should be reasonable as-

' surance that the behavior of the exterior wall

systems tested in the laboratory agrees with the | behavior of the walls in the structure. To obtain this I assurance is not an easy task, and it is recom- mended that more effort should be directed toward

correlating the performance characteristics deter- mined in the laboratory with those determined in the field.

References

[ 1] Fishburn, Cyrus C, Effect of Mortar Properties on Strength of Masonry, NBS Monograph No. 36, November 1961.

[2] Whittemore H. L. and Stang, A. H., Structural Properties of Insulite and Insulite Partition Constructions, NBS

Report, EMS 31, October 1939.

[3] Whittemore, H. L., et al. Strength of Houses, NBS Report

BMS 109, April 1948.

[4] Clouser, William S., Creep of Small Wood Beams Under

Constant Bending Load, Forest Products Laboratory Report No. 2150, September 1959.

[5] Anderson, L. O., Guides to Improved Framed Walls for Houses, U.S. Forest Service Research Paper FPL31,

August 1965.

\
PERFORMANCE TESTING OF FLOOR COVERINGS

Winthrop C. Wolfe and William C. Cullen

Building Reset

Institute for App.

National Burea

Introduction

Floors and floor coverings are more or less taken

for granted, but many properties are involved in the

selection and use of these products. For example,

manufacturing concerns are interested in durable

floors for their factories. Office buildings require

floors which are economical and resistant to wear

from walking traffic. Hospitals need floor coverings

which are sanitary and which will allow for free movement of beds, stretchers, food carts, portable

X-ray units, and other mobile equipment. Owners

of restaurants, hotels, motels, and private homes

want attractive, easy to clean and durable floors. A good deal of the marketing of floor coverings

is based on the interplay between the advertising

and sales promotion of sellers and the desires and

judgment of buyers. Some consumers, however,

purchase on the basis of material specifications and

test products which sellers offer to them. Among

the pertinent tests are those which show the quality

of the materials or construction of the product. For

example, a buyer might analyze vinyl asbestos tile for vinyl content or examine carpet for density and

pile height. Performance tests, on the other hand,

are tests of product behavior properties considered

to be desirable by consumers, and are designed to show how products will perform in use over a reasonable period of time. For example, an abrasion

test might be performed to show how long a floor

covering might be expected to last; a fire test might

be run for safety reasons. Some performance requirements are subjective

and are difficult or impossible to evaluate by laboratory test. Color, gloss, pattern, texture, and sensory

"feel" are important in sales and consumer ac- ceptance but do not lend themselves to rigorous

I scientific analysis in this connection. Color, color

\ changes, and gloss can be measured but their relaj tionship to performance requirements is highly subI jective. The consumer must decide which color is

j preferred or whether a glossy or matte finish is the

I more acceptable. Other performance requirements.

irch Division

ied Technology

4 of Standards

however, are objective and are of great practical

importance. Some performance requirements refer

to the state of the product as delivered. For

example, the product as furnished to the consumer

should be sanitary, flame resistant, non-slip,

resistant to static charge, allow easy movement of

wheeled equipment, be comfortable to walk on,

quiet, easy to maintain, and spot resistant. Other

requirements refer to retention of desirable

properties in use, or the time dimension of properties, and might be grouped together as durability or life. Durability, the time dimension of per- formance, includes resistance to wear, impact, light,

water, and other deteriorating factors. Performance

tests of durability are difficult as they are attempts

to predict future in-service behavior on the basis of

short duration tests. A research program has been initiated by the

Materials Durability and Analysis Section of the

Building Research Division at the National Bureau

of Standards to study the requirements identified

above. Under the sponsorship of the Public Health

Service, limited laboratory studies of starting and

rolling friction and resiliency have already been

conducted as part of this program.

Health and Safety — Sanitation

Foremost among the various requirements are properties related to health and safety. This is especially true in the case of hospitals. A floor covering should be sanitary, easy to clean, and

should not contribute to the spread of germs,

dust, and dirt. This is one concern that hospital

management has expressed over the widespread

use of carpet in patient areas. While previous

studies in private hospitals have indicated that

textile type floor coverings are sanitary, further

investigations are suggested. Sanitation, or the ef- fect of floor coverings on the biological environment, covers not only the possible spread of disease

but allergy from dust, dirt, and particles from the

floor covering. This type of work is regarded as

85
86 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

more properly within the purview of the Public

Health Service or others expert in this area and is thus not covered in detail in this discussion.

Fire Safety

Another factor which causes some concern about

the use of carpet in some areas is fire safety. The

question of what kind of carpet is safe from a flammability or flame spread standpoint is important and has not been resolved. No satisfactory test method has been universally accepted. The method

frequently used for interior finishes, including

carpet, is that described in ASTM Method E-84

and is generally referred to as the tunnel test. The

method has been criticized to some extent because

the specimens are mounted on the top of the tunnel

facing downward. Such a procedure would be

expected to produce results differing widely from

those obtained in service where floor covering

materials always face upward.

Slip Hazard

According to a recent survey [1] falls are one of

the greatest causes of accidental deaths. This area

is one where research appears to offer possibilities

for reducing the incidence and effect of the hazards.

Accidents of this type are generally due to slipping or tripping. A slip may be defined as a pedestrian's

sudden loss of traction in a forward or backward

direction. On the other hand, a trip is a sudden halt

in a pedestrian's progress. The person may stumble over an unexpected interposed object or may balk

because of a sudden increase of friction in the walkway. Having slipped or tripped, the resilience of the

floor covering then becomes a factor in the degree

of injury suffered.

Slip hazard is related to the coefficient of friction of the floor covering. A number of devices have

been used to measure slipperiness of walkway sur- faces. A survey was made of test apparatus and test methods by a task group of the Building Research

Advisory Board [2]. The National Bureau of Stan- dards participated in this study. One of the test machines described in the report was the Sigler Slip

Tester, which was developed at NBS [3]. This pendulum-impact type of instrument was later modified

and is now available commercially as the British

Portable Tester. This instrument and its operation

are described in ASTM Method E-303, Tentative

Method for Measuring Surface Frictional Properties. The design of the British Portable Tester is based on the motion of the foot in walking. Initial test results have indicated, however, that it does not

seem well adapted to testing sliperiness of carpet.

Another device which appears to be suitable for on-the-site floor testing is identified as the slipmeter

[4]. This device has not been investigated by the

National Bureau of Standards.

Static Charge

Many have experienced the static electrical discharge shock people get indoors after walking

across a carpeted floor or after sliding across plastic seat covers in a car on cool, dry days. In the winter

when homes and vehicles are heated, the environmental humidity becomes quite low. Under these

conditions, the body becomes statically charged

when people walk across carpeted floors or slide on

automobile upholstery. The spark accompanying

the discharge on contact with a grounded object,

while only annoying at home, may present a hazardous situation in a hospital operating room.

Static charge is considered a serious problem in hospital operaUng rooms and is discomforting and

possibly dangerous in other locations within a

hospital.

A study of conductive flooring for hospital

operating rooms was reported in 1959 by Boone

and co-workers [5]. This report describes some of

the techniques for evaluating the effectiveness of

conductive flooring by measurement of electrical resistance. The problem of evaluating carpet for

anti-static property is complicated by the irregular nature of the surface. Considerable work is being

done by the carpet industry on anti-static measure- ment techniques. The methods used are based on

the measurement of voltage changes due to walking on carpet or the mechanical application of friction. The maximum voltage generated and the decay or

rate of decrease of voltage at the end of the

procedure are taken as indicative of the anti-static property of the carpet. A carpet is considered to have good anti-static characteristics if the max- imum voltage generated in the test is low and the

voltage decay rate is high. Some have suggested

that the tribo-electric effect is the basic physical

property related to increase in voltage due to walking across carpet, and that the decay rate of voltage

is related to the electrical conductance of the carpet. A need is indicated for further studies relating to electrical theory and practical testing.

Convenience — Movement of Wheeled Equipment

Performance characteristics of floor coverings

must also be considered in terms of comfort and j
PERFORMANCE TESTING OF FLOOR COVERINGS 87

convenience. These factors become very important

as they affect the essential operations of the building. For example, moving wheeled equipment on

the floors is a routine part of hospital operations.

Patients' beds are frequently moved and patients

are transported to or from the operating suite on

v^'heeled stretchers. Food and linens are brought in on wheeled carts. Sometimes it is necessary to move extremely heavy although mobile X-ray units

throughout the hospital. Obviously the floor or floor

covering must not impede to any significant extent

the movement of these wheeled vehicles.

A laboratory program to study the resistance of

floor coverings to the movement of wheeled vehicles has recently been completed at the National

Bureau of Standards. This program illustrates the manner in which research to develop test methods

can lead to the establishment of performance

criteria. In order to define the problem of pushing

wheeled equipment on the floors of a hospital

nursing unit, a survey was made of this type of

equipment used in the nursing units at the Clinical

Center, National Institutes of Health, Bethesda,

Maryland. Estimates of the weights of various

wheeled vehicles were obtained. In addition, a bed was loaned to NBS for the purpose of the study.

The bed was of the manually adjustable type and

weighed about 300 pounds, which is considerably

lighter than the more modern electrically-adjusted

type. Table 1 gives data on types of wheeled equipment common in hospital nursing units. The manual type of bed was used for the laboratory studies to measure rolling friction. The measurements were made with the bed empty and with

a 300 pound load to simulate a patient. Casters for

j the bed which were used in the study were new, 5

I inches (12.7 cm) in diameter, with 1-inch (2.54 cm)

; wide tread. Two sets of casters (four in each set) were selected for use, one set made of hard rubber

Figure I. Equipment for testing resistance to wheeled equip- ment. Platform with carpet; hospital bed and connections to load cell, pulley, crosshead of load-strain testing machine.

and the other made of soft rubber. The tests were

performed using a load-strain testing machine. A

strain gage load cell was connected to the foot of the

bed and attached to the crosshead of the testing

machine by means of a pulley and cable arrange- ment. The equipment is illustrated in Figures 1,2,

and 3. Tests were performed at a crosshead speed

of 19.7 in. (50 cm) per minute, with the casters or

Table I . Typical wheeled equipment used in a hospital

Equipment Weight Wheelbase

Track - Casters diameter Tread

width

poundsinches * inches '' inches * inches * Manual bed and patient 500 85 34 5 1 Stretcher and patient 300 42 22 10 1 Mobile X-ray unit 1,000 21 Front wheels 14 4 l'/8 Rear wheels 22 10 21/8

' The wheelbase is the distance, hub to hub, between front and rear wheels. " 1 pound = 0.454 kg (approx.). ^The track is the distance between centers of front or rear wheels. " 1 inch = 2.54 cm (exact).
88 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

Figure 2. Detail of bed, load cell, and connections.

Figure 3. Detail of load cell and connections.

Figure 4. Alignment of casters.

wheels carefully aligned in the direction of pull.

Alignment of the casters is illustrated in Figure 4. The floor coverings under test were cemented

directly to a plywood substrate, with the exception

of stretched carpet. The plywood base was then

leveled by means of wooden shims. Typical test resuks are given in Table 2. The measurements

were obtained on the loaded bed, weighing 590

pounds (268 kg).

Although the measurements made at NBS

required the use of a genuine bed and a platform, 4

by 12 feet (1.22 by 3.66 m) in size, on which the

floor covering was applied, it is suggested that a

Table 2. Resistance offloor coverings to a wheeled hospital bed

Floor covering

Frictional force or load in pounds

Hard rubber casters Soft rubber casters

Unloaded * 300 lb. load Unloaded* 300 lb. load '

P <i r s P e p f' P f p" <t s Pr*^ P

A — Vinyl asbestos tile 11.1 5.3 24.6 13.1 12.0 8.8 28.1 21.2 B — Sheet vinyl 25.9 14.8 34.9 26.5 26.2 15.0 40.4 29.7 C* — Nylon carpet 20.1 15.1 41.3 31.3 18.0 13.4 36.4 28.0 D* — Nylon carpet 17.2 13.3 36.9 27.1 19,6 15.1 38.2 30.9 E* — Nylon carpet 23.8 17.8 47.7 35.8 26.0 20.0 47.4 36.1 F* — Nylon carpet 23.7 17.1 46.4 34.5 19.9 15.1 39.5 31.9 G* — Nylon carpet 33.3 24.9 60.8 46.4 30.4 22.1 52.7 41.0 H*- Olefin carpet 31.6 23.9 57.0 48.5 28.5 21.2 53.5 42.5

I — Indoor-outdoor carpet 24.1 18.2 46.8 36.2 25.5 19.2 46.5 38.0

" 1 pound force = 4.45 newtons.

' Hospital bed, manually operated, with spring and mattress. Total weight 290

pounds.

' Hospital bed, weight 290 pounds, with additional 300 pounds weight. Ps= Static friction = Force in pounds required to initiate motion. Maximum force recorded.

•' P|, = Rolling friction = Force in pounds required to sustain motion. Average steadystate force recorded.

C* — Looped pile tufted without backing. D* — Weave with sponge rubber cushion. E* — Looped pile tufted, foam rubber cushion. F* — Looped pile tufted, solid vinyl backing. G* — Looped pile tufted, sponge vinyl cushion. H*-With hair felt pad.
PERFORMANCE TESTING OF FLOOR COVERINGS 89

somewhat modified test procedure, using a smaller

wheeled vehicle, preferably with a kinematic support of three casters, be considered for future test programs. The weight of this smaller test vehicle

could be adjusted to simulate the variety of hospital

as well as other vehicles used in service and could

be designed to accommodate the variety of casters

available for wheeled vehicles. Smaller floor assemblies could also be employed. These smaller assemblies would be less expensive, require smaller

specimens, and could easily be stored for possible

repetitive tests after scheduled soiling, cleaning, or other treatment of the floor covering. Correlation

of results obtained with the smaller vehicle with the

results of the tests already performed at NBS with

the hospital bed would be helpful. The new test could then be proposed as a standard acceptance

test, based on performance. Such a standard test would benefit using agencies, as new materials

could readily be evaluated to determine their

suitability as coverings for floors.

Comfort — Resilience

To most people, soft floor coverings feel more

comfortable and luxurious. The subjective impression, at least initially, is that walking on soft floor

! coverings is less tiring and there appears to be less danger of bodily injury if a fall should occur. This

I property, however, may be psychological rather

j than physiological. If there is any physiological adI vantage in selecting certain floor coverings, it should be related to a measurable physical properI ty. Resilience then becomes an important per- formance characteristic.

A program was initiated at NBS to develop

techniques to measure the energy of compression

I of floors and floor coverings. If the assumption is

I made that the subfloor is concrete, which is a valid

I assumption in the case of most modem hospitals,

I! and since concrete is considered a non-resilient

material, the floor covering is the only part of the

i floor system which contributes to resilience.

' In the NBS tests for measuring the energy of

'I compression of floor coverings, the specimens of

j floor coverings were mounted on cement mortar

i panels. The assembly was placed on a 10 by 10 by

I

1 inch (25.4 by 25.4 x 2.54 cm) steel plate. This in turn was placed on a flat cylindrical plate, which was substituted for the lower jaw of the load-strain

testing machine. The machine was equipped with a

variable speed crosshead and strain gage load cell,

I connected to a continuous recorder. A flat cylindrical plate was substituted for the upper jaw of the

machine. Force was applied to each specimen by means of a cylindrical, flat indentor of 1.125 inch

(2.86 cm) diameter, giving one square inch (6.45

cm2) of contact area. The apparatus and specimen

are shown in Figure 5.

TIN',

Figure 5. Apparatus and specimen for compression-recovery

test. Shown from top to bottom: crossiiead and load cell; cylindrical plate; cylindrical indentor; carpet sample; cement

mortar panel; square steel plate; cylindrical plate.

In performing the test, the steel base plate was

first approximately centered with respect to the

upper and lower cylindrical plates of the load-strain

tester. The composite specimen was then placed on

the steel plate and the indentor was placed at the center of the specimen. The crosshead was lowered

so that the upper plate just touched the indentor,

holding it in place but not exerting any force. The

controls were activated and the crosshead lowered

at a rate of 0.39 inch min. (1 cm min.) until a load of

approximately 220 lbs. (100 kg) was indicated. The

direction of crosshead motion was immediately

reversed. A curve giving the compression-recovery

of the specimen was obtained on the recorder. Typical curves are shown in Figure 6. The energy of

compression was taken as the integral of the area under the compression portion of the curve. The

maximum force was expressed in pounds and ener- gy of compression in foot-pounds. Since the force,

in each case, was exerted over one square inch area, the resulting pressures in pounds per square inch were numerically equal to the force. The relative values for energy of compression were about what one would expect. Firm materials,

such as asphalt and vinyl asbestos tile, showed low

energy values, while relatively high energy values
90 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

The test results agree with the observations of

Holden and Muncey [6], who state that "Variations

due to changes in floor surface are almost non-existent, the only noticeable effect being the disappearance of a small impact peak when the subject

changes from ordinary floors (concrete, wood) to lawn ... At first sight it is surprising that the curve for a relatively soft floor like cork tile is almost identical with the curves for wood and

concrete. This is probably because in the foot-sockshoe-floor system the deflection under load occurs

almost completely in the flesh area between the

skin and bone of the heel and the difference in the

deflections of cork and concrete, due to their

different Young's moduli, is completely obscured.

For the lawn, where the deflection is likely to be

comparable with that of the flesh, the impact

peak disappears."

Acoustical Properties

Today we live in a noisy world, owing to increase

in population and mechanization. Hospitals appear

to be no exception and are often noisy places, in spite of the patients' need for rest and quiet. Patients, who are not feeling well, are confined with

little to do but listen to the noise. Sounds are trans- mitted into the patients' rooms from radios, televi- sion sets, floor polishing and cleaning machines,

carts and clattering dishes, conversations of both

Table 3. Compression energy offloor coverings

Maximum force Energy of compression

lbs. kg. ft.-lbs. joules

Asphalt tile (average of three tests) 203 92 0.04 0.05 Vinyl asbestos tile (average of three tests) 195 89 .04 .05 Solid vinyl tile (average of three tests) 182 83 .04 .05 Backed vinyl sheet floor covering 220 100 .13 .18 Cushioned vinyl sheet floor covering Brand A (average of three tests) 203 92 .18 .24 Brand B (average of three tests) 197 89 .30 .41 Brand C 220 100 .46 .62 Linoleum, '/s-inch gauge, burlap backed 291 132 .23 .31 Wool looped pile carpet with hair pad (average of two tests) 188 85 1.15 1.56 Wool looped pile carpet with waffle sponge rubber pad (average of two tests) 176 80 1.06 1.44 Wool looped pile carpet with attached foam rubber cushion 220 100 .79 1.07 Acrylic looped pile carpet with hair pad (average of two tests) 178 81 1.23 1.67 Nylon looped pile tufted carpet 223 101 .42 .57 Nylon looped pile tufted carpet with attached foam rubber cushion 223 101 .47 .64 Nylon modified upholstery weave carpet with attached sponge rubber cushion 202 92 .50 .68 Nylon looped pile tufted carpet with attached sponge vinyl cushion 226 103 .52 .71 Nylon looped pile tufted carpet with solid vinyl backing 227 103 .32 .43 Polypropylene needlepunched non-woven felt carpet 223 101 .58 .79

165 lbs. —

-J--'

0.59 tn.

\

0.20 In —r~

Haximum Fon

1/

ENERGY \

COMPRESSION //•}- A//////////^Ar,

2.0 cm 1.5 cm 1.0 cm Wool Carpet with Rubber Cushio:

Figure 6. Typical compression-recovery curves.

were obtained with soft materials, such as carpets

with rubber cushions. These results correlate quite

well with subjective experience. A person feels the

difference between a hard and soft surface. Carpets

feel more "cushiony" and comfortable. Surprisingly, however, the energy values are all quite low, never having been more than two foot-pounds.

Results are given in Table 3.
PERFORMANCE TESTING OF FLOOR COVERINGS 91

Staff and visitors, machinery inside the hospital,

street noises from the outside, and numerous other

sources. Surely patients would rest better in a quiet

environment.

Specialists in acoustics recognize surface noise

and impact sound transmission as contributors to the noise problem. Surface noise is radiated into the

environment by contact of people and objects with

floors or other hard surfaces. Impact-generated

sounds produced by walking on the floor above are

often transmitted to the space below.

Acoustical experts recognize the contribution of

certain kinds of floor coverings in alleviating the

noise problem. Floor coverings which are "soft" or

resilient tend to reduce the generation of surface

noise and impact sound. Pile floor coverings are "soft" and provide a relatively large area of sound

absorbing surface, thus reducing the general overall

noise level. Massive floor coverings, of course, help

reduce the transmission of airborne sounds.

A reliable method for evaluating the sound ab- sorption of floor coverings is by reverberation

chamber measurements [7], but small specimens of

floor coverings have been screened for sound ab- sorption by using impedance tube measurements

[7]. Standard methods are available to measure im1 pact sound transmission of floor-ceiling assemblies

[8]. The relative effects of different floor coverings can be determined by acoustical measurements on

the same fundamental system with the different floor coverings in place.

Resistance to Water and Solvents

It is important from the viewpoint of maintenance

and sanitation that floor coverings should not soak

up water or allow water to penetrate through to the

subfloor and become trapped. This situation may

i provide a breeding ground for microorganisms,. Cerij tain materials might remain wet after spillage or wet

j cleaning. This might result in wet feet, odor, ferii( mentation, mildew stains, and growth of pathogenic

organisms.

»; Solvents, beverages, medications, chemicals, and

I such common materials as cleaning fluids and nail

{ polish may also damage or be retained by floor

coverings. This situation is familiar to experts in {"spotting" (removal of concentrated stains) and

cleaning.

I There are currently no laboratory methods for

[evaluating floor coverings for moisture and other

liquid resistance, suggesting a fertile field for test method development. Such a program would, however, appear to require research more intensive

than is justified by present interest in the subject.

Economics

The cost of a flooring system is something which

appears difficult to correlate with technology or

standardization. It is generally considered to be a matter for the market place. The user states his needs in the form of specifications and frequently

awards it to the lowest bidder. Important per- formance characteristics are, however, related to cost and often strongly influence it. Textile type

floor coverings have been considered to be a luxury

item because the initial cost is usually higher than

that of the conventional asphalt and vinyl asbestos

tile commonly used in offices and institutions. Recently some proponents of textile type coverings

have argued that these materials are less expensive

in the long run because the cost of their maintenance is less than that for those identified as

resilient flooring. On this basis, textile type

coverings have been promoted for general use in corridors, lobbies, classrooms, general purpose (not

executive) offices, and patients' rooms, in office

buildings, schools, homes, and hospitals. The argu- ment is that the cost of floor covering should be

figured on an annual basis. The whole subject of

utility cost of various floor coverings is open to unbiased investigation.

Wear or Durability

One of the most important performance requirements, related to cost and of interest to all con- sumers, is wear, durability, or life expectancy. How

long will it last? A good deal of time, effort, and

money has gone into research on test methods to measure wear of floor coverings. There are some

excellent studies and review articles on wear of

floor coverings and theories for design of test machines to simulate foot traffic [9, 10, 11, 12]. Results of past attempts to correlate laboratory

tests with field studies under actual use conditions,

however, have been less than satisfactory. The National Bureau of Standards believes that research

should be continued at a moderate level on this subject.

Maintenance and Repair

Performance characteristics under this general

heading include soilability; cleanability; stain re332-247 0 - 69 -7
92 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

sistance; ease of stain removal or spotting; and

repair or replacement, including patching. There are no laboratory methods for evaluating floor

coverings for any of these characteristics. Repairs

and replacements are in the province of skilled workmen and may be outside the scope of laborato- ry tests. It is believed that selective research in these areas might be profitable.

Conclusions and Recommendations

Research at the National Bureau of Standards on

resilience and resistance of floor coverings to move- ment of wheeled equipment provides an example of

how performance tests can be developed. Research on test methods in these important areas should be

continued. Research on sanitation should be done

by an independent laboratory competent in this area. The question of fire safety is already part of a broad program on fire safety and flammability of

textiles which has been initiated at the National Bureau of Standards. While the National Bureau of

Standards has devoted considerable effort to acoustical properties, slip hazard, and static charge,

there is need for more work on floor coverings of all types, including textile and non-textile. Development of test methods in these areas and in others

will require supplementary field studies. Little has

been done on the development of performance stan- dards for soilability and cleanabiUty, stain removal,

and soil transport; these areas require study before

embarking on a program. Maintenance cost must be

evaluated by means of a field study.

Acknowledgment

This study benefited greatly from the cooperation

of the carpet industry and the staffs of the National

Bureau of Standards and the National Institutes of

Health. The authors wish to specially acknowledge

the following persons:

Mr. William H. Rockwell, United States of

America Standards Institute, Inc., New York,

N.Y. (formerly with American Carpet Institute).

Mr. Howard W. Spence and Mr. Corwin Strong,

Clinical Center, National Institutes of Health,

Bethesda, Maryland.

Mr. Leopold F. Skoda and Mr. Thomas H.

Boone, National Bureau of Standards.

The investigation was sponsored in part by the

Division of Hospital and Medical Facilities, Public

Health Service, Department of Health, Education

and Welfare.

References

[1] Vital Statistics of the United States, vol. 2, Part A, Table

122.

[2] Building Research Advisory Board, Federal Construction Council Technical Report No. 43, Causes and Measure- ment of Walkway Slipperiness, National Academy of Sciences— National Research Council Publication 899,

Washington, D.C., 1961.

[3] P. A. Sigler, M. N. Gieb, T. H. Boone, Measurement of

the Slipperiness of Walkway Surfaces, J. Res. NBS, 40, 339 (May 1948), RP 1879.

[4] Charles H. Irvine, A New Slipmeter for Evaluating

Walkway Slipperiness, Materials Research and Standards,

7, No. 12, 535 (Dec. 1967).

[5] Thomas H. Boone, Francis L. Hermach, Edgar H. MacArthur, and Rita C. McAuliff, Conductive Flooring

for Hospital Operating Rooms, J. Res. NBS, 63C, No. 2, 125 (Oct.-Dec. 1959); NBS Monograph 11, March 21, 1960.

[6] T. S. Holden and R. W. Muncey, Pressures on the Human

Foot in Walking, Australian Journal of Applied Science,

vol. 4, No. 3, 405 (1953).

[7] Cyril M. Harris, Acoustical Properties of Carpet, J. of the Acoustical Soc. of America, vol. 27, No. 6, 1077 (Nov.

1955).

[8] International Organization for Standardization (ISO)

Recommendation R-140 (E). Field and Laboratory Measurement of Airborne and Impact Sound Transmission, 1st ed.,Jan. 1960.

[9] F. C. Harper, The Abrasion Resistance of Flooring

Materials, Wear, 4, 461 (1961).

[10] Herbert F. Schiefer and Richard S. Cleveland, Wear of Carpets, J. Res. NBS, vol. 12, 155 (Feb. 1934), RP 640.

[11] Herbert F. Schiefer, Wear Testing of Carpets, J. Res. NBS, VOL 29, 333 (Nov. 1942), RP 1505.

[12] Martha L. Nensley and Hazel M. Fletcher, A Service Study of Twelve Cotton Broadloom Floor Coverings,

Journal of Home Economics, vol. 47, No. 2, 110 (Feb.

1955).
SESSION V. BANQUET

L. M. Kushner, Chairman

TECHNOLOGY AND THE CITY: CLOSING THE GAP

Robert C. Weaver, Secretary

Department of Housing and Urban Development

I would suspect that the title of this conference is pretty dull to the average person. "Performance of

Buildings — Concept and Measurement" doesn't exactly swing. And it swings even less for the average

conference goer, who is far more likely to be con- cerned about the performance and measurements

of Toots Latour at a go-go club downtown than of

a GSA office building on Independence Avenue.

But to all of us here, this is an important event. The reason for that fact is explained in the an- nouncement for this conference.

It says in effect that America has huge problems

in furnishing decent shelter for its people. We have

made great strides in scientific and technical ability.

Where we have fallen short — and this may be over- simplified—is in applying that ability to improving

and increasing our supply of sheUer.

I say this may be oversimplified. I think we all realize that it is not only the lack of an interdisciplinary approach that makes it difficult to apply

technology to shelter problems. There are also constraints imposed by outdated building codes and

other matters that are more political than scientific

in nature. Be that as it may, the point here is that we must

get on with what this conference came here to do:

to exchange ideas and knowledge and to eliminate

confusion in the measurement of performance of

buildings.

Your announcement also makes the point that we

haven't the time to let nature take its slow course in applying our most advanced technology to shelter needs.

We must all agree. The evidence of population growth and rapid

I urban expansion is there for all to see. So is

I evidence that we are not using all our potential in

1 meeting these needs.

The obvious analogy, and the one we see most

j often and which is indeed valid, is that we have

|i brought together immense resources of money and

I scientific knowledge to land a man on the moon.

But when it comes to man and his shelter, we have

'! not only failed to move into the future, but are not

even making use of our existing resources of

knowledge, technology, and materials.

But there is another element that is important

here. We have come into a time when public realization

of our housing and urban problems is acute,

because evidence of these problems is inescapable.

No man today can hide from bad air and the

evidence of too much traffic. He can see decay in the city core and the instant blight of too rapid

growth at the urban fringe. He cannot escape the

facts of poverty and restlessness in the urban

ghetto.

Most people realize that given the facts of population growth and increasing urbanization, these

problems will be compounded rather than solved

unless we give them our full attention and a good

deal more of our resources. Coupled with this wider public realization of

urban and housing problems — and obviously corollary to it — is an increased national effort to solve

these problems.

In the years since I was first appointed to stewardship of the national housing effort, I have

had the privilege of helping shape this national ef- fort. It is remarkable to me, as I look back on those

years, how the mood of Congress has changed in that time. Even as late as 1965, a great year for progressive legislation, we had a real donnybrook

over the rent supplement program. This good and

necessary program was stigmatized as "socialistic"

by some of its opponents, and we won passage by

a very thin margin.

I can understand why some Congressmen had

profound doubts about the program. It appeared to be a radical departure from past Federal programs,

in that it directly subsidized rentals for those unable

to find decent shelter at a price they could pay. The

fact that the Federal Government through FHA

had, in effect, been subsidizing shelter for those

better off under its mortgage insuring program for many years, was brushed aside.

Winning that battle and going on to make the rent supplement program work was, I believe, an impor95
gg PERFORMANCE OF BUILDINGS —

tant break-through. Congressmen who had voted

reluctantly for rent supplements were less reluctant

this year when the Administration brought in its new home ownership and rental programs for

low-income families, both of which involve a subsidized interest rate. And this was supposed to be

a much more conservative Congress than that of

1965.

I am not trying to say we have arrived at nirvana,

and that we will not have to maintain our efforts to get these programs funded — a process that is now

going on — but I do believe there has been a signifi- cant shift in opinion and that despite inevitable set- backs, we will see very little attrition to our good

housing and urban programs.

I will talk about the new 1968 legislation at some

length in a moment, but first let me make another

point, one of great significance to this audience.

As you well know, research on housing and city

problems has received little attention from the

Federal Government in the past. We did have the

beginnings of a national program in the 1950's, but

it died rather abruptly.

But today we have in the Department an Office

of Urban Technology and Research with sufficient

funding to start what we hope will be a continuing

and expanding search for solutions to our housing

and urban problems. The President has just

launched an Urban Institute, in which private and

government efforts will be combined to attack these same problems. You have heard from Mr. Craun,

of HUD's Low Income Housing Demonstration

Program, of another aspect of our experimental pro- gram. You heard from Dr. Pfrang, who conducted

an unusually important and successful performance

test of a low-cost housing system, again for HUD.

In our Model Cities Program, we have a massive,

nation-wide effort to innovate in housing and urban

solutions, and to try them out on a large scale. That,

basically, is the largest experimental effort ever launched by any Nation in the area of housing and

city problems.

These are signs of the times. These efforts may

not be as large as we want, or go as far as we know

is necessary, but I am convinced that as a nation we

will never again ignore the need for housing and

urban research. We cannot afford to do so. That we

know.

I think all of you here realize, however, that your

efforts here this week are essential and vastly important primarily in connection with the Housing

and Urban Development Act of 1968.

CONCEPT AND MEASUREMENT

This is a very large commitment by the Nation to the people of America's urban places, and it is particularly designed to help those Americans who

most need help.

It provides sufficient authorization and Federal

aid to expand good traditional programs such as public housing, and urban renewal, and rent supplement housing. It will allow us to implement the

Model Cities Program on the level we think essential.But the major new emphasis is on volume construction of housing. In this category, it is by far the

most ambitious and meaningful housing program in the Nation's history— both for Federally-assisted

and private building.

And it is here that the things you are doing will have essential and lasting importance.

The President gave us this goal:

The construction of 26.2 million new housing

units in the next ten years, in both private

and publicly-assisted units. This is a big

order when compared with 14.4 miUion units

built in the past ten years. PubHc assistance for 4 million new housing units.

| That is a big order when compared to the

half-million of the last decade.

Public assistance to rebuild 2 million existing

units. That is a very large order when compared to the

25,000 units of the last ten years. In order to meet these goals, we must not only ex- pand effective traditional programs, such as public

housing, but we must create a new generation of

housing programs.

These are the most important and dramatic:

A new program to give families of low and

moderate income the opportunity to buy

their own homes. We will subsidize the in- terest rate on mortgages for these homes, so

that the home owner will be paying as little as 1 percent. There will also be a comparable

subsidy, again on mortgage interest rate, for

\ rental housing.

We want to expand the rehabilitation of basically

sound housing into an effective industry.

And we plan to bring local people — those

who need work in the affected neighborhoods—into this effort. This is a vitally important part of this program.

We plan to establish National Housing Partnerships between private enterprise and the |
TECHNOLOGY AND THE CITY — CLOSING THE GAP 97

Federal Government, with tax incentives to help make the low and moderate income

market more attractive to private investors.

The President's goal is to provide assistance during the first three years to begin construction and

rehabilitation of 1 ,470,000 units. We are engaged here in what I consider one of the

most important efforts in the thirty-year history of

Federal urban programs. And that is no less than

the building and rebuilding in the next ten years of

enough good, decent housing to replace substantially all of the substandard housing in America. As

long ago as the Housing Act of 1949, Congress

declared that the Nation should bring about "the

realization as soon as feasible of the goal of a decent

home and suitable living environment for every

American family ..." That was almost 20 years ago. We must make

every effort to see that another 20 years does not pass before we fulfill that promise to the American

people.

Many of the programs I have mentioned apply for the most part to the cities and urban communities we now have. But to meet fully the needs of a growing population, we have developed still other new

programs. One of the most exciting is one that can make possible and practical the planning and building of entirely new communities. Here we can not only dream but carry out the best of which we are capable in urban design.

If these efforts are to succeed, we must have an

active and imaginative research program going at all times. We must find new materials, and learn how

to use them. We must take the new technology and

apply it to building and rebuilding our cities. We

must turn researchers loose on our massive

problems. We must train more and better urban and

housing people, and we must help States and local communities upgrade their own human resources. We must increase our efficiency in administration, and that we are working very hard to do at the

Federal level in our relatively new Department of

Housing and Urban Development.

And we must improve the efficiency of our

buildings. Decent housing has always been and al- ways will be the first and essential physical component of a decent life. And it will be to our lasting

shame if this vastly productive and energetic Nation cannot bring that elemental decency into every

American life. That is your ultimate goal as you confer on such

seemingly dry topics as performance testing of exterior walls and of sanitary plumbing fixtures.

I commend you to the excitement of what you are

doing.

SESSION VI. TRENDS AND OPPORTUNITIES

J. P. Eberhard, Chairman

PLANNING AND ENGINEERING OF A NEW CITY (COLUMBIA, MARYLAND)

G. D. Wright, Jr.

Bernard Johnson Engineers, Inc. 10221 Wincopin Circle

Columbia, Maryland 2 1043

Abstract*

The concept of a new town is explained briefly.

The town consists of manageable units-the town

center, villages, and neighborhoods. The town

center contains a hospital, a regional shopping

center, restaurant, hotel, theatre, and facilities for other cultural needs. The village center is a focus

for much of the active life of the town. It contains

stores for weekly shopping, junior and senior high

schools and recreation facilities including provision

for teenage activities. The neighborhood center,

which offers a point of orientation for families and

children, includes a playground for preschool chil- dren, a nursery and elementary school and a general

store. The citizens in a large measure, live, work,

sleep, pray and are entertained within the confines

of the town.

Planning documents are discussed and their use

as the basic economic model for development is il- lustrated. The planning document contains information about the allocation of space on land use for detached houses, town houses, industrial and public use with a schedule of construction for a ten or fif- teen year period.

The planning document is translated into an en- gineering document. The engineering document

shows the associated phases of construction to complement the planning document and the

requirements for utilities such as electric, gas, telephone, water and sewer.

Abstract prepared by the editors. The speaker did not submit

a manuscript.

The engineering document is translated into computer language. The next step in the development

of the engineering planning is to approach the computer program with various questions. A typical

question would be given the basic development as determined and set forth by the economic model,

what is the financial exposure resulting from un- derground electric distribution systems. Similar

questions can be asked concerning other utilities such as gas, water or sewer. Information is obtained from the computer about

costs per square foot of different types of land use such as residential, commercial or industrial. Total

annual electric bills or gas bills can be determined

in line with proposed land use. The computer can

also give requirements for water use at any period

in the development of the project. The answers sup>- plied by the computer assists the planning team in determining the economic advisability of developing any particular area or selecting the next area to be developed. It becomes a probability game.

The applications of the basic planning document,

the basic engineering document and the computer

program are almost unlimited. A study was made of

the feasability of a central heating and chilling plant

for the downtown area of Columbia. A comparison was made of the economic advantages of electric heat pumps, electric resistance heating and gas

heating.

The financial and social success of a new town

are vitally dependent upon an excellent basic

planning document, a sound engineering document

and a comprehensive computer program that can

supply essential information.

101

THE NATIONAL IN-CITIES EXPERIMENTAL LOW-COST HOUSING RESEARCH

AND DEVELOPMENT PROJECT

Philip D. Bush

Vice-President, Kaiser Engineers

Division of Kaiser Industries Corporation

Oakland, California 94604

Kaiser Engineers, under contract with the Department of Housing and Urban Development

(HUD), is heading an association of firms that is undertatcing Phase H of the National In-Cities Experimental Low-Cost Housing Research and Development Project. This project is a major part of HUD's

program to determine how, under what conditions,

and to what extent the nation's urban regions can

begin to construct rapidly a relatively large amount

of lower-cost and, therefore, innovative housing—the characteristics of which are responsive to the fundamental, social, and economic needs of the

nation's lower income families. The Model Cities Program and this experimental

project are responsive to the nation's needs for urban redevelopment. In the next 10 years, our nation must build or rehabilitate 26 million units of

housing to provide for new family formations,

removal of existing housing, and rehabilitation of

substandard housing. These requirements represent an annual production level of 2.6 million units per

year, or an increase of about one-and-a-half times

the recent average annual rate of 1.7 million units

per year. Significantly, it has been estimated that 6

to 8 million households will not be able to afford the

price necessary to pay for standard housing.

Furthermore, the goal of 600,000 housing units per

year for low and moderate income families

represents a twelve-fold increase over the 50,000

subsidized units currently being produced annually.

The housing industry has, traditionally, been able

to construct adequate housing for those with the

ability to pay. The national challenge now, however, is to be able to construct lower-cost housing

at a rate twelve times greater than ever before ac- complished, for costs that are commensurate with

the lower-income groups' ability to pay, and

designed to meet their needs.

In March of this year, HUD requested proposals

|: from industry to undertake the "In-Cities" project.

The In-Cities Project seeks to identify and measure

the effects of the major constraints existing within

the cities, and which inhibit the introduction of in- novation in the production of lower-income housing. Constraints are factors which slow the pace of

establishing lower-income housing or inhibit an in- crease in the pace, increase the cost or inhibit cost reduction, or unfavorably affect acceptability of the

housing by the users. The project objectives will be

accomplished by carrying out a series of related ex- periments consisting of actual construction of

groups of dwelling units. The experiments will be

designed to involve these constraints so as to measure their effects on cost, time and acceptability of

the completed housing, and to establish the effec- tiveness of methods to reduce or eliminate their ef- fects. From the nineteen proposals submitted, HUD

selected three, and early in May awarded contracts

for Phase I of the project. One contract was

awarded to each of Westinghouse Electric Corporation and a joint venture of Abt Associates, Inc., and

Daniel, Mann, Johnson and Mendenhall. The third contract was awarded to Building Systems

Development Inc. (ESDI) of San Francisco in as- sociation with Kaiser Engineers, General Research

Corporation, Real Estate Research Corporation,

Turner Construction Company, and OSTI (Organization for Social and Technical Innovation).

These three contracts were competitive contract

definition efforts with identical comprehensive

work programs to be accomplished within a six-week schedule. Each of the three contractors

did the following:

1. Studied 25 Model Cities together with some

others to provide detailed information

needed to assist HUD in ultimate selection

of those cities in which housing experiments

could be undertaken;

2. Identified, studied, and evaluated new

design, construction, and management

techniques and systems to be explored in the

103
104 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

conduct of the subsequent housing experiments in specific cities;

3. Worked with city officials, residents, and

labor, industrial, and professional groups to determine the critical housing needs and

major constraints to housing innovation;

4. Estimated the cost and time of carrying out

useful housing experiments; and

5. Suggested to HUD cities and experiments

that in interrelated total should be considered

for the overall national experiment.

Inthe course of BSDI/Kaiser's Phase I activities,

members of the team visited all of the seven HUD

regional offices, and also communicated with the

CDA's (City Demonstration Agencies) in each of

the cities that HUD assigned to us. Comprehensive

questionnaires were sent to each city. The questionnaire dealt in depth with site characteristics, community participation, availability of potential sponsors, availability of seed money, financing, labor,

building codes, and other elements of major importance. We also held a briefing conference for representatives of the cities at the Kaiser Center in Oakland to present personally to them the experimental in-cities housing project as visualized by us and to obtain as much information from them as

possible.

Data from the questionnaires, along with infor- mation contained in the relevant Model Cities" ap- plications and from other sources were organized

to provide the basis for evaluating and recommending the cities. The evaluation was based on:

1 . Their commitment to provide decent housing

for lower income groups;

2. Their desire and willingness to undertake in- novative sub-experiments;

3. Their resources to perform the sub-experiments; and

4. Their ability to accommodate one of a comprehensive set of experiments which would

have overall long-term meaning.

Over 350 contacts were made with known in- novators in the building industry and with manufacturers of building products to obtain the latest current information on technology applicable to the

housing process. This survey provided information

relative to 81 building systems and 30 sub-systems

(electrical, mechanical, structural). The technologies were screened to;

1. determine if they would be available within

the time constraints of the program;

2. determine if their performance characteristics were likely to meet the minimum

requirements of the probable user; and

3. determine if they showed any potential construction cost reduction or other advantage.

The user-needs requirements of the populations were estimated from a survey of available literature and from the experience of members of our team

who have had extensive recent experience in working with the ethnic groups involved. From general

studies of social and institutional problems related

to lower-income housing, a set of relevant social or- ganization experiments were identified, involving:

1. The use of space;

2. Delivery of social services to the residents;

3. Management of housing developments;

4. Tenant-incentive programs to reduce maintenance costs;

5. "Sweat-equity" programs;

6. Self-help programs; and

7. Involvement of community groups in the

planning operation.

At the same time, another group within our team

investigated in depth the procedures for obtaining

mortgage insurance and financing for innovative

housing sub-experiments which appeared possible

without legislative action. Sub-experiments involving mortgaging and financing were then developed

which appeared suitable for experimentation.

From these evaluations, three distinct sets of subexperiments emerged, comprising the ingredients

for a comprehensive attack on the nationally signifi- cant social, financial, and technical problems in producing housing for lower-income families. The

sub-experiments were then matched to cities in- cluded in the Phase I study. The other two contractor teams, working with their approximately 30 ci- ties each, prepared their Phase I reports in similar

fashion.

Subsequently, HUD selected Kaiser Engineers

to carry out the actual Phase H experimental pro- gram and issued a contract and notice to proceed on ' June 28, 1968. Kaiser Engineers is compiling a composite of the reports of the three Phase I contractors for publication by HUD. It will be a com- pendium of their findings with respect to (1) user needs, (2) building technology state-of-the-art, (3) constraints to the establishment of housing for lower-income families, and (4) city information.

Currently, we are involved in the design and

planning for implementation of the sub-experiments

to be carried out in Phase II, including recommen-
NATIONAL IN-CITIES EXPERIMENTAL LOW-COST HOUSING RESEARCH & DEVELOPMENT PROJECT 105

dation of the cities in which the sub-experiments

should be located. Initial selection of the cities with

which appropriate negotiations can commence will be by HUD; the first group of such negotiations are now expected to commence within a very few

weeks.

The methodology we used for formulation of the

experimental project starts with a statement of a problem which is preventing the construction of

low-cost housing for lower-income families and

which could be solved by innovative methods, if such innovations were not affected by constraints

existing in the "system." One example shown

below is the problem of high-density, high-rise

dwellings for lower-income families. Problem Statement:

Many people responsible for public housing believe that high-rise dwelling units are an inappropriate housing type for lower-income families in the inner city. There have been unsatisfactory ex- periences in the operation of several high-rise pro- jects in various parts of the country. These projects

have been expensive to build and costly to operate.

They have been subject to vandalism and have high

crime rates. Undesirable features attributed to high-rise projects include:

1 . Lack of access to recreation and shopping

2. The corridors and elevators provide opportunity for crime and violence

3. Lack of play areas where mothers can supervise children

4. Lack of adequate social services or facilities (day care centers, meeting rooms)

5. "Project" image — no personal expression for the tenants

6. Inadequate dwelling unit size with resultant overcrowding and lack of privacy.

The competition for land within the inner cities demands a higher density of dwelling units. The

economics of the city require that maximum use be

made of the land to generate tax income to support

the services required. A requirement that housing

for lower-income families be built at lower densities

may in the long run be more detrimental, since it will discourage the provision of badly needed housing by increasing the land cost of the units, and

decreasing the tax income and services which flow

to the residents from that income. Lower density

will not be possible within existing cities without

substantial relocation and consequent disruption.

The current view appears to be that high-rise

units should be provided only for elderly lower-in- come families. This may create further social costs

since such projects can result in separation of the el- derly from their own families who contribute substantially to their social well-being.

The Housing and Urban Development Act of

1968 places limitation on high-rise structures in low-rent public housing projects for families with

children. The forecasted growth of the population

in the cities and probable rapid spread of high-density lower-income population areas indicate that the

high-rise approach should be re-examined in the

"In-Cities" Project to determine the specific factors

which affect the costs and acceptability of this form

of housing for lower-income families.

Hypothesis:

It is hypothesized that high-rise building can be

used to house lower-income families successfully

in urban environments with high population density

and scarce land. (Success is defined in terms of

original and operational cost, construction time, and

acceptability to occupants, management and community.)

Previous failures of high-rise dwelling units for

lower-income families can be overcome through:

1. Relatively inexpensive design modifications

to the internal arrangement and structure of

the building and the use of suitable available

materials, products and systems.

2. Better planning of the building and its rela- tionship to the surrounding environment.

3. Improved management and maintenance policies and procedures.

4. Improved tenant selection, orientation, and

involvement.

5. Integration of communities' activities and social services within the residential structure. Design hypotheses that would be tested include:

1. Using a basic space allocation for families

(according to size) and permitting them a choice of apartment layout and interior finish

will result in a greater degree of tenant ac- ceptance.

2. Designing interior space with a high degree

of adaptability to a wide range of uses will result in

( 1 ) a greater acceptability on the part of the tenant since the space can be adjusted

as the family changes.

(2) less cost attendant to the changes in te-
106 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

nants and greater response to the needs

of different tenants.

3. Using the high-rise building for multiple pur- poses, including therein the necessary commercial and community facilities for the te- nants and the surrounding community (day

care center, neighborhood center, snack bar,

grocery store, launderette, etc.) will result in greater acceptability of high-rise projects to the tenant and to the surrounding community. 4. Proper "cluster" design of the entry spaces

and elevators, and the use of available equipment for security can reduce the incidence of

crime and provide greater security in high-rise dwelling units.

5. Improving architectural design to provide

pleasant visual distinction between the project and the surroundings will improve ac- ceptability by the tenants and the community.

6. Allocation of space between dwelling units

and communal areas will be more acceptable

to the users if they are involved in this planning.

User needs hypotheses to be tested include:

1. Involving the community (e.g., model

neighborhood organizations) in the development decisions will result in greater acceptability of the dwelling units and the project.

2. Involving the members of the user groups in the planning process as "non-professional"

planners will result in greater acceptability

of the project.

3. Involving indigenous labor in the construction process will result in greater acceptability of the project to the user and the

community.

4. There is a difference in acceptability of pro- jects based on the sponsors' backgrounds

and origins.

5. Tenant advisory groups can assist in housing

management and improve acceptability

without increasing housing management

costs.

6. Returning unused balances of operation and

maintenance reserves will improve tenant

responsibility and result in lower costs of

operation and maintenance.

There are currently developed technologies for the high-rise dwelling construction which can

reduce costs of this type of building while meeting

the needs of the users. Technical innovation could

be used which would permit testing the following

hypotheses:

1. Offsite factory-produced structural shell units can be provided at final costs equal to or less than those of current construction

with more efficient use of labor.

2. Indigenous labor can be used in the production of the housing components at competitive costs.

3. Incentives can be found to reduce labor

union restrictions to new technologies and

indigenous labor.

4. Methods of approach to code authorities can

be developed to remove code constraints.

5. The use of an industrialized technique will reduce the impact of seasonality on the work

force with a consequent reduction in cost. Technological schemes which could be con- sidered for this sub-experiment include a number of

structural systems such as the Balency and Bison

reinforced precast concrete systems and several

service system concepts including unitized bathrooms, plastic piping and total energy systems.

There is a procedural and legal hypothesis that can be tested: By obtaining HUD/FHA approval of

a procedure for minimum certification, the

processing time for a housing project can be substantially reduced.

The foregoing is one of the typical problems to which the In-Cities Experimental project will be ad- dressed. There are other high-priority problems

which will be included in the project. The user needs, constraints, innovations and eligible cities to be tested as part of the expected solutions to the

problems have been tabulated and organized into various matrices which lead to priorities and levels of importance for their inclusion in the overall project.

The first step links together three sets of key

input variables and a set of possible locations. The

input variables are:

1 . Specific groups of lower-income users in urban areas who are most in need of improved housing, i.e., large black families, el- derly families, medium-sized Spanish-speaking families, etc. The groups were further

defined on the basis of family size, position

in the life cycle, and income level. The basis

for priority ranking is population level, ur- gency of the group's housing need, and the

likelihood of the need being met through use
NATIONAL IN-CITIES EXPERIMENTAL LOW-COST HOUSING RESEARCH & DEVELOPMENT PROJECT 107

of existing means, that is, the degree of need

for Federal assistance.

2. Basic building types and dwelling unit densities, referred to as "vehicles", i.e., detached

houses, attached houses, low-rise apartments, etc. Both new and rehabilitated housing is included. Each vehicle is assigned an

applicability rating according to the degree

to which it meets the needs of each user

group.

3. The most severe constraints inhibiting the in- troduction of innovation to production of

each type of lower-income housing in urban

areas; i.e., building codes, labor practices,

financing, use of indigenous labor, etc. Subsequent steps use each set of input variables

to generate a series of potential sub-experiments

that would provide information vital in rapidly ex- panding production of urban housing for lower-in- come households. The sub-experiments concerning

user groups provide data on how to serve their

needs better, lower the costs of doing so, and raise the acceptability of the resulting housing to its occupants. The sub-experiments concerning basic vehicles involve technological innovations in building

design and techniques aimed at the same objectives

as for the user group sub-experiments. All sub-experiments will involve constraints and, thus, will provide data on how to counteract them, therefore

cutting housing costs, accelerating production time,

and increasing the acceptability of lower-income

housing to the users and the community. The loca- tions are the specific cities in which a given sub-experiment is needed and can be performed effectively and rapidly.

The synthesis included a process of selecting

specific items from each of the above types of

sub-experiments and combining them into "experimental clusters." To do this a matrix was prepared

with the user groups and their rank as rows and the

vehicles with their applicability ratings as columns.

Each intersection of row and column indicates a

potential experimental cluster, and a multiplication

of the user need ranking by the vehicle applicability

factor gives the priority rating of the cluster. Each

cluster contains an internally consistent and interre- lated set of sub-experiments that will provide useful

knowledge about all three types of input variables

(user groups, building types and constraints),

usually including several technological innovations

and several constraint-reducing innovations. The

entire set of experimental clusters will provide a significant test of all the sub-experiments likely to prove most effective at ameliorating constraints,

better serving user needs, and testing the effects of

technological innovations.

The method to this point has enumerated the

potential experiment clusters and has given each a

priority.

The next task was to match the cities to the combinations of user groups and vehicles. This was

done by the use of another table which rates each

city as to its appropriateness to the user group-vehicle combinations; those combinations having a low

priority rating are discarded. The city ratings were

based on the degree of interest in the city in lower-cost housing, the city's capability of supporting an experiment, and the degree to which signifi- cant impediments to the construction of lower-cost

housing exist in the city.

Specific sub-experiments are next designated for

the purpose of testing the acceptability by the users of the various aspects of housing for lower-income

families. These are concerned with what seem to be

misfits between present housing approaches and

lower-income user needs and aspiration. These

sub-experiments are organized in two groups:

1. Those which generally apply with distinct

priorities for the various user groups, and are therefore subject to ranking. They address

problems of planning and design.

2. Those which generally apply with very little difference in priority between the various

user groups. They are concerned with

problems of the project development process

and housing management.

A matrix has been prepared tabulating the user need experiments against the user groups. A lowmedium-high ranking is established for each of the

sub-experiments, rating its applicability to each of

the user groups.

A list of constraints applicable to the user needs

and aspirations is then prepared which ranks the

constraints as low, medium or high levels of importance. Finally, a set of sub-experiments is designed to explore methods of relieving each of the

high-level constraints such as community attitudes

and willingness on the part of the user to assume some degree of operating and maintenance responsibility.

The final tool needed for carrying out the process

of establishing the experimental program is a sum- mary tabulation prepared during Phase I. which

lists all promising building innovations and relates

332-247 0 - 69 -8
108 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

them to vehicles to which they can be applied with

the highest potential cost saving.

At this point, the following tools have been

created:

1. The overall priority ratings of potential ex- periment clusters

2. The sub-experiment relationships which are:

(1) the user needs experiments related to user group by priority

(2) the constraint-related experiments and

their priorities

(3) the tabulation of innovations rated as to

their applicability to the vehicles and

user needs and aspirations

3. A city group selection table. The use of these tools in the complete definition

of a sub-experiment may be summarized as follows:

1. Select a first order problem, such as how to

rehabilitate housing on scattered sites on an economical basis.

2. Select a small set of compatible first order

innovations (such as vest-pocket urban

renewal covering an aggregation of scattered

properties) which specifically address the

problem.

3. Identify the first order constraints such as administrative procedures which inhibit the

application of each of the innovations.

4. List candidate cities, i.e., cities in which

( 1 ) This problem exists

(2) These innovations have not been tried, or have not been successful, because of

these constraints

(3) The administration wants to solve the

problem

(4) The internal conditions do not pose

city-specific constraints which cannot

easily be removed.

5. Identify the user groups (ethnic, family size,

income, etc.) in each city most in need of

housing.

6. Identify the building types and project types

(vehicles) most appropriate to the city and

most applicable to the user groups.

7. Select a city, group(s) and vehicle(s).

8. Identify second order problems, such as in- spection of a pre-fabricated unit assembled

in another city.

9. Develop second order innovations, such as acceptance of the assembling city inspection

by the receiving city for the material in Item

8.

1 0. Identify second order constraints, such as re- sistance to Item 9. 11. Reiterate Steps 7 through 10 for all cities listed in Step 4. 12. Reiterate Steps 1 through 11 unfil all first order problems have been covered.

13. Screen sub-experiments for balanced inclu- sion of user groups, vehicles, first order in- novations, first order constraints, cities,

sponsorship types, etc.

14. Redesign sub-experiments as necessary to obtain balance and favorable cost-benefit

ratio. 15. Submit to HUD with recommendations.

16. Select cities (HUD).

17. Negotiate with cities — (Kaiser Engineers).

1 8. Reiterate steps 8,9, and 1 0 as necessary.

19. Design city-specific procedures for implementation.

When the series of sub-experiments is believed

to be complete, three checks are made:

1 . A check of the number of cities with high ap- propriateness rating which have been

selected as sub-experiment locations, compared to the total number with high rating

2. A rough cost of the total construction pro- gram

3. A check of the high-priority sub-experiments

to determine how many of the high-priority user needs, constraints, and innovations

have been used.

Finally, an overview judgment is made as to whether some really relevant and important sub-experiments have been omitted, or some others of a

lesser level of significance have been incorporated.

Some "cut and try" adjustment can be expected to be made which will increase the scope of the experiments or reduce their cost without reducing the

total project scope. The experimental program as a whole will have

a set of resources — personnel, material, money,

time — and a complicated set of interrelated activifies which together will comprise the system for performance of the program. Since the activities all have a duration, have precedence relationships to other activities, are subject to certain constraints,

and consume a set of resources, they can be ordered

into a network and a chart of accounts, and can,

thus, become the entity around which the project

data base will be organized.
NATIONAL IN-CITIES EXPERIMENTAL LOW-COST HOUSING RESEARCH & DEVELOPMENT PROJECT 109

This project data base will satisfy the three major

aims of the information system effort:

1. assistance in "real-time" project management

2. the development of a data bank for the per- formance of specific analyses of the impact

of constraint variations in the sub-experiments

3. the base from which acceptable extrapolations can be made from the low volume of the

sub-experiments to the necessary high

volume of the national requirement.

The basic premise is the use of ordered activities linked to an account ledger as the primary entity

around which the data base is organized. The pro- gram is made up of three separate and distinct phases:

1 . a planning phase

2. a scheduling phase

3. a data collection monitoring phase.

The scheduling phase begins when the plan for accomplishment of a sub-experiment has been

I developed and the input data that describe the plan

have been produced. At this point a numbering

j system common to both scheduling and costs is

; devised and schedules are generated in formats as

I required for various purposes.

I The third phase is the one that (a) enables project

I management to keep up with the project as it is

! being executed, and (b) creates the data bank

! needed for the sub-experiment. Management data

1 will describe new activities, delete activities,

change activities, record the work performed, and

ji record changes in the projected job quantities,

f man-hours and costs, the status of open commitments, procured items, etc. This information not

1 only allows the project manager to control the proI ject as it is being executed, it also enables him to

! measure the effects on the schedule of proposed

' changes in plan. Separate from project management

!] is the need for processing the experimental data.

I Data on construction and operating costs, and all

|! other statistics which are to be analyzed to establish

the results of the sub-experiment, will be processed

I as needed prior to analysis. All information col-

\\ lected will allow the history of the entire project to

II

be reconstructed in as much detail as deemed

necessary and useful. Kaiser Engineers has been working for several

\ years with various integrated computer control

i packages and has used them successfully on a

number of large projects. These systems are cur- rently being expanded to form the basic structure

for a large part of the "In-Cities" information

system. Using interlinked programs and files, the

latest package includes routines for scheduling

work, measuring physical progress, cost reporting

and comparisons of cost to budget, productivity

analysis, procurement and processing status, force

reports and management reporting and analysis.

Additional data files will be needed for the infor- mation pertaining to social experiments concerning

acceptability and user need. These files will be used

to compute descriptive statistics such as means,

variances, correlation coefficients, etc., which can

be subjected to various analyses. Definition of the

requirement for this type of data is proceeding and

its relation to the information system will be

established following this definition. On completion of the selection and adoption of

the experimental program, the tasks of implementing it must be accomplished. The first general task

will be to prepare what might be called a prospectus

which described the overall experiment and sub-experiment objectives and plans. It will specify the

general size and configuration of the structures, the

type of construction, building technology innovations to be included in the detailed design, typical

unit floor plans and other details of the physical

aspects of the plan. It will also outline other facets not directly concerned with construction, such as

financing, and the management system to be used

for operating the completed project. This document

will be used at the outset of implementation of a sub-experiment plan to explain to city officials,

citizen groups, potential project sponsors, etc., what the sub-experiment is and what it is designed

to accomplish.

Kaiser Engineers and HUD will assist the city in

its selection of a sponsor (hopefully indigenous to the area in which construction will take place).

When the sponsor has been selected, specialists

from Kaiser Engineers' team will be made available

to the sponsor to provide needed assistance in site acquisition, obtaining financing, selecting the

architect and construction contractor, obtaining

permission to use building innovations which do not comply with existing building codes, and all other

aspects of the task of accomplishing the work. We

will also provide assistance to the sponsor in or- ganizing the operating management of the

completed facilities and in monitoring the results over a reasonable period after operations begin.
110 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

It is anticipated that some sub-experiments may

be subcontracted either in part or in their entirety

to interested industrial firms, such as a firm who

produces a major building component or system

that is to be incorporated within a specific sub-experiment.

For the duration of the project, close monitoring

of each sub-experiment will be maintained to assure

that the sub-experiment will be effective in meeting

its objectives. Procedures established for change

control will examine any proposed sub-experiment

change for its effect on the entire experiment before

the change is effected. Finally, when data are complete for any sub-experiment, analyses of costs and benefits will be

made for both technical and social elements, and

overall conclusions and recommendations documented in the final reports for the project.

The timetable is to begin construction on some of

the sub-experiments in the Spring of 1969 and to have construction complete on all sub-experiments

by the end of 1970.

This is a big project, an important project, and the

first controlled experiment in housing conducted

"in-city" on a national scale. It is devoted to the

greatest national housing need — that of lower-in- come families. Not all of the sub-experiments will lead to lower-cost housing that will have successfully removed constraints and satisfied user needs.

But most of the sub-experiments will be successful

in those respects and on that basis, this program will be a very important part of HUD's charter to improve significantly the manner in which the people

of the United States are housed.
THE ROLE OF THE PERFORMANCE CONCEPT IN URBAN SYSTEMS

Terry Collison

Relation to Other Conference Themes

By this point in the conference we have heard and

discussed the impact of the performance concept at a couple of different levels or scales and for several

different applications. We have talked about the

performance concept in relation to building materials, in relation to building components, in relation

to systems within buildings, and in relation to the

organization of many systems within a complete

building.

One presentation— and I personally attribute

great significance to its inclusion in this kind of

meeting— focussed directly on users, their needs

and role within a performance context. Since per- formance requirements derive ultimately from the

needs of users, it is ironic that it seems so easy to lose a consciousness of the user when we start ex- amining alternate ways of actually delivering per- formance.

Materials and hardware systems are things we

can manipulate. Users and meeting their needs are

the objects of the manipulation. We hope that we

can serve them by the way we use materials to en- close space in buildings and by the quality and ar- rangement of various life and activity support

systems.

This is a more or less neutral performance objective: to provide service and performance to the

level of user needs. Yet the relation between per- formance and need is hardly ever so finely tuned; one usually exceeds or falls short of the other. Much of the incentive now for a performance orientation—at this conference and in fact generally— grows out of the realization that per- formance capability commonly does not measure

up to needs. Against this background condition, the

neutral performance objective seems a thoroughly

positive one. But user activities and needs can also be in- fluenced by the performance structure in which

they are exercised. That is to say, user activities and needs can also be manipulated. True, the nature

of this manipulation (or influence or effect, if that seems a more comfortable word here) is inexact,

imprecise, and often indirect. But it is a factor. The

way space is enclosed and services conveyed in- fluences the way people behave and the benefits

they derive. In the negative situation, where per- formance capability exceeds immediate user demands on the system, then personal and social

growth and development can occur. This is a restatement of themes presented in many different ways in previous sessions at this Conference. We are now going to talk about the

performance concept at a new and somewhat unfamiliar level. We are faced on the one hand with

the basic complexity of urban problems and the

seriousness of current disfunctions within various

urban systems. Yet at the same time we cannot fail to recognize both the potential for life in cities and

the dynamics of metropolitan expansion and

regeneration. Given a sense of both the problems

and the potential at this level such a restatement of- fers a good basis on which to begin this presentation. It establishes a context for the concepts I want

to set before you and for the discussion which I hope will follow either here or informally later.

I would like to discuss the following items:

I would like to start by briefly examining the na- ture of urban systems as we will be talking

about them.

Next, I would like to give examples of urban

systems which I think it useful to discuss

within a performance context. Third, I would like to refer to an analysis and

design procedure for handling the requirements within individual urban systems and

for responding to common or conflicting per- formance requirements that may exist

between two or more systems.

Fourth, I think it important to point up significant

themes and implications that grow out of a performance orientation to urban systems

and to the problem of planning, developing,

and operating them.

Finally, I would like to identify three directions

for further research and test applications of

the performance concept in urban systems.

Ill
112 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

The Nature of Urban Systems

There are various ways of slicing up the urban

community into systems. We have all done this either perceptually as we identify the transportation

system in which we ride, or logically as we attribute

systemic characteristics to something like housing

which most of us really know directly only by its in- dividual physical units. These examples are plausible enough yet at the same time there is something intriguing about them.

For example, in speaking casually of the transportation system, it seems somehow more natural to use

the word "ride" rather than the word "drive". Even

with its current state of generally less-than-satisfactory performance, the "ride" type of transportation—rail, bus, subway — seems perceptually more

like a system than the drive-type of facili- ty—highway, arterial, collector road. Physical

identifiability and specialized use are factors here

I believe. The key word, however, may be "seems",

for physical identifiability and special use functions

are probably not what determines whether

something is or is not a system.

In the second instance, the housing system, we

speak comfortably about a phenomenon that can be

conceived as a system only if we include the as- sociated operation of financing mechanisms, legal

instruments, marketing programs, building and

development regulations and a series of related activities, none of which inheres in the physical object, the house, which is the product of the system's

functioning.

There is a parallel case in the transportation

system. It is easy to identify the transportation

system as the buses, the trains, or the subways that move people about in a metropolitan area. It is easy, too, to include bus drivers and train engineers

as part of this system, but more difficult to include

such disparate things as change-booth personnel,

elevators in office buildings, or street signs. Not impossible, certainly, but simply a stretch of the

imagination as these things fill a role that is further

removed from what seems to be the major objecfive or purpose of the transportation system.

On reflection, however, it is clear that the ability to move people and goods within an urban area would be seriously impaired by the lack of these additional items. To the extent that they enable

"transportation" to occur, they must be considered

part of the transportation system. (It is important to

realize that one of these elements may act as part of

other systems as well. For example, street signage

may well be considered part of the communications

system with respect to the problem of delivering

mail. And the requirements for the two different

urban systems may be dissimilar.)

Through these examples we begin to understand

something about urban systems and the concept of

performance in relation to them. To bring this into

focus we should consider the following five contrasts: A partial versus an expanded concept of an urban

system

Public versus private system responsibilities

Hardware versus software system attributes

Service-oriented versus product-oriented sys- tems

Operating versus development systems

The example of the transportation system and the

housing system reveals something about the way

urban systems are commonly perceived and

identified. Urban systems which are perceptually

obvious tend to be only individual elements of the

structure or process that is the real system. We

note, for instance, that only certain aspects of the

total movement apparatus in an urban area are com- monly regarded as "the system". There is both a

bias for some modes over others and an incomplete

inclusion of ancillary but sfill necessary system

aspects for any given mode.

If the transportation system is an instance where

the casual or immediate conception is a partial one

(including some aspects and ignoring others), the

opposite is true of housing. Although there are many systems within a house, there is nothing especially systematic about the physical inventory of

"housing" at the urban level. If one wishes to speak

of the housing system (and there are several valid reasons for wanting to do so), he must include the

operation of the other institutions we cited earlier. This is a case where the concept of the system must

be expanded beyond its initially obvious elements

or its apparent product.

The second contrast is between public versus

private system responsibilities. It may seem that the

dominant characteristics of housing are private.

Although this dominance may or may not prove

true after more detailed analysis, there is no urban

system which comes to mind that excludes one or

the other sector enfirely. The public role in trans- portation does not in itself qualify the activity as an urban system any more than the apparent
THE ROLE OF THE PERFORMANCE CONCEPT IN URBAN SYSTEMS 113

dominance of private responsibilities in housing

precludes it from being considered an urban system.

A third contrast, that between hardware and soft- ware system attributes, is a similar case. The urban

transportation system may have a very high investment in hardware while some other urban system,

like social services, may have almost none. It seems

to me that this is not significant here. The education

system, while having a substantial hardware component, nevertheless is characterized by its soft- ware aspects. Hard and soft distinctions may be

useful at some level of analysis, but again, not as prerequisites for an activity being considered truly an urban system.

The fourth contrast is between activities having

service as their output and those having tangible

products as the result of their operation. The

problem in drawing distinctions arises in something

like the education system where the output can

either be considered as a service (development of an individual's abilities) or as a product (either the

skills that are developed or the people that are

trained). The distinction may well have implications

for the way a system is operated (to maximize a ser- vice aspect or a product aspect), but it is not signifi- cant in distinguishing urban systems from

non-systems.

Finally, we consider the case of operating

systems in contrast to what I have labeled development systems. This is probably the most significant

distinction of the five. Transportation as we know

it is essentially an operating urban system con- cerned with providing service through the commitment of resources within an existing structure of in- stitutions and hardware. By contrast, housing is most often thought of as a development oriented

system concerned with generating a new inventory

of shelter in metropolitan areas. These examples would imply that operating

systems have a service output while development

oriented systems have a product output. I think this distinction is tied to the fact that the qualitative and

quantitative demand on the urban housing system

is currently more dramatic and even critical than is the demand on the urban transportation system. By

contrast it is possible to consider a time when a major purpose of the urban transportation system

will be to create new quantitative and qualitative

circulation capacities or when the housing system

will operate essentially to meet balanced internal

demands, well understood housing needs, and per- haps minor population shifts.

There is a clear difference between operating

systems and development systems in terms of goals

and the way each is administered and run. These

differences, however, seem to be a matter of degree

rather than of fundamentals. As performance de- mands on an operating system increasingly exceed

the delivery capacity of that system, then pressure

accumulates for it to take on some degree of

development orientation.

The lessons learned in examining these contrasts say something about a valid definition of an urban

system. Rather than defining urban systems con- venUonally by the institutions which have evolved over time to meet needs in the community, it is now

useful to re-examine the various areas of need as they currently exist. Since needs shift over fime and

since new needs can develop, the pattern of existing

institutions may not correspond to the present pat- tern of needs.

Institution-based systems tend to perpetuate

themselves by continuing to value and therefore

recognize the type of need which originally brought

the institution into existence. It is precisely because

it can transcend the limits of individual existing in- stitutions that the performance concept is so valuable when applied to the urban or community level. Instead of starting with an institution and identi- fying what it does, an urban concept of performance

starts with what is produced and from it infers the

existence of a production system. An urban system,

therefore, tends to be (a) functionally oriented

rather than institutionally defined and (b) generic in nature rather than limited to any particular means

of delivering desired performance.

The Relation Between Urban Systems

In Figure 1 is a matrix with a listing along the left side of 27 operating urban systems.' Figure 2 describes these 27 urban systems and reading down

this list one can quickly get an impression of the

functions that have been singled out. You will note

that the matrix is predicated on a simple inputoutput model. A number of resources are fed into a transformation process whose nature is inferred

from the resulting product or output that occurs. You will note also that both direct output and

indirect or "waste" output is generated by the

operation of any of these systems. Of course the

waste output is not literally useless but represents

' This conceptual framework has been developed by Professor Richard D. Berry at the University of Southern California.
114 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

DEVELOPMENT SYSTEM

'ENVIRONMENTAL DETERMINANTS OF SYSTEM CHANGE'

COS

111 z %

UJ >

|_ (0

W 2 >- <

CO ffi i

=

iij 2c a. UJ °

s

CM

I 2

3

4

5

6

7

6

9

10

I 1 12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

H K

Figure Matrix.

either slack utilization of the input resources or an incidental output of the system.

There is nothing magic in the number 27 and

there is generally nothing magic in the titles that

have been set to the system. In fact, some of these

now seem unfortunate choices. The basic idea,

however, is reasonably clear. All 27 urban

sub-systems together form a fully functioning com-
THE ROLE OF THE PERFORMANCE CONCEPT IN URBAN SYSTEMS

3 ^

o z

4 > £ o tc «

V) Ul o in z Z z UJ

2^4 «I O 3

Z UJ w

o fi2

o tr £ Hi UJ 3

5 w to

O ^ §3IT O

UJ £

a. UJ o o

zs

O S

OQ Ul 11

m (r 3 (TDM

2 §«

S z 3

CE (U f)

E5i

S D m

5 o 3

O I «
116 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

munity. This is taken to be a more-or-less "closed"

system in itself, with the output from any given

system used as an input for some other system or

systems. This pattern corresponds to the familiar

biological and economic concept of efficiency or

conservation.

The reader is asked to do some visual and mental

juggUng at this point. In Figure 2, the list of 27

operating urban systems will be the left-hand, or

vertical portion of the matrix in Figure 1 . Figure 3

,

here called the Functional Definition of Community Development System starts at its left side with a list (vertical column A) of six input parameters.

It is these six "Environmental Determinants of

System Change" which form the horizontal portion

of the matrix in Figure 1

.

The other kind of system — the development

system — can also be illustrated (Figure 3). Here the

objective is, as we mentioned earlier, to bring a new

structure into being, or perhaps to reorganize an existing operating structure. This particular model is couched here in terms of community development

but is also applied to various individual elements of

community development as well. Housing is a case

in point. Housing is an organization of performance

capabilities that can be described in terms of ele- ments in this model. Sub-system #24, the enclosure

system for the community, provides settings for

residentially-based activities as well as for other

kinds of activities. In addition, the enclosure subsystem interacts with many other urban subsystems, among them numbers 2, 3,7, 15, 16, 19,

20, 21, and 25. The degree of dependency varies

from case to case, of course. Finally notice that there is a linkage between the

development oriented system and the 27 operating

systems. The six-way grouping of descriptive fac- tors occurring along the left hand side of Figure 3 also appears across the top of Figure 1. This

enables one to describe the creation or establishment of any given operating system in terms of the

basic development model.

This can be quickly illustrated and summarized

with reference to sub-system #25, the Population

Transportation system:

The Population Transportation system is a function of government regulatory structures and

is sometimes itself a government service.

It is a function of available capital financing and

contributes to public revenues through the

taxation structure.

It affects the structure of property ownership

along rights-of-way. It responds to the struc- ture of property use and precipitates changes

in that structure and its levels of intensity. In theory the transportation system should be

responsive to socio-economic growth and to various kinds of social and economic in- terchange.

The transportation system must respond to the

geography and physical structure of the land

and its pattern of development.

Finally, it is obvious that the kind of transportation systems we build will be a function of

available construction technology. In the case of the transportation system, such a

limit is particularly unfortunate at this time

since the evolution of applicable transportation technologies has tended to lag behind

urban circulation needs.

Role of the Performance Design Procedure

With this understanding of urban systems and the

outline of their interrelation, I would like now to

refer to the idea of a performance design procedure

as it is applicable at this level. The characteristics

of this procedure may shed additional light on the areas we have discussed so far. There are five general steps in the performance

design process:

First one must establish the design objectives or performance goals.

Next, he must identify the design constraints or

limits within which these objectives must be

realized.

Third, there must be some method for applying

the performance objectives within these

design constraints. Currently this question

of design methodology is the subject of ex- tensive interest within the design field. The fourth element is simulating and measuring

the performance potential of alternate designs.

The final step is a revision of design in light of this measurement and the feedback process.

These last two steps, of course, are found not only in the design phase but in the operational phase

as well. In such an extended design process, per- formance—either actual or simulated— is used to measure alternate designs against program objectives and as a basis for revising and altering delivery

systems in order to maximize performance objectives.
THE ROLE OF THE PERFORMANCE CONCEPT IN URBAN SYSTEMS 117

t- t ^

2 S S 5

O

V)o

)ST/B

SK-C( PRATE o E (0

@ © © ©©©000

T3 ^ -a o I ^ OQ " -a u c

x: as

u

E oi o • ^ c C

r- 6 1^ § 3

CD u ° 2

u c

03 1)

I

T3

o s

1 ^

0)c 3

a> <^

(li a> u 5 a. u

u = .s -

C3

2 I

•c h X) E P O

o 3 U C 1) • =

. H r/^ 1^ [/I ra o .-e O S

I Q

-a

I CL Q

OS m

I/)

c _•

a- 5

si M

Q S

3^ C ME n

c o o a» If

Q t _ t«

O w

c -a U 1) > c

3) '5

c .22

x: i>

^ o

<

_o

(Ua

-Jo

03 -a

E ^

E H

55
118 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

Design methods for urban or community systems

have been developed and expanded upon elsewhere

by myself and others. If some of you have a further

interest in this particular area, I can direct you to and additional discussion of this.'-^ What is important

for the present discussion is the idea behind this design approach — namely

1. to lay out the limits within the entire

design problem,

2. to identify requirements, their influences,

and their limiting effects,

3. to identify all points where design alternatives may exist,

4. to generate the alternatives for each point,

5. to explore the overall implications of

selecting each particular alternative,

then

6. to optimize performance objectives

throughout this network of design alter- natives.

This approach is in marked contrast to the conventional way design is done.

Often the limit in the conventional process is that

design investigations occur in a sequence of dis- crete steps. Generally there is little chance to adjust a previous decision in light of subsequent insight

without thereby undermining the value of all other

design decisions which are conditional on the

original sequence.

By contrast the systems design approach asks

that a resolution between design alternatives not occur until the moment when it actually must occur, and then only after conscious evaluation of all the

alternatives and their larger implications. With its emphasis in expanding sets of design alternatives

rather than closing them down, the systems design

process may actually identify alternate ways to meet urban performance objectives through several

different operating systems or a combination of

them.

Themes and Implications

There are several significant themes and important implications that follow from the distinctions

we have drawn.

It seems to me that it is at the level of urban

systems that a number of the other performance

2 Terry Collison, Systems Planning for New Communities;

A presentation to the AIA/ACSA Seminar on "The Impact of

Industrialized Building on Architectural Education" (The

American Institute of Architects; September, 1968).

capabilities which we have discussed here at this Conference come together and thereby fall into some kind of overall relationship.

It is at the level of urban systems that some of the

performance implications for building components

and building service systems may start to bump into one another and conflict in a meaningful fashion.

Because the effect of such conflicts is so diffuse,

their resolution will frequently depend on conscious

policy decisions. At the level of urban systems such

policy decisions can be especially significant. Consider, for example, the implications of such relatively clear issues as dimensional coordination for

materials or performance-based specifications for plumbing systems. Here the lack of "fit" occurs between hardware items in building systems, ag- gregated and considered at the urban scale. Let us also consider a conflict directly involving

performance requirements and delivery systems at the urban level. At this point in time the institu- tionally defined city school "system" and the per- formance defined urban education system

frequently seem related to one another only by his- tory and imagination. To many who participate in the institution, school seems irrelevant to life as they know and must live it. To detached analysts

who are interested in the delicate problem of per- sonal development, the institution often seems not only irrelevant to life, but hostile to personal

development regardless of the area in which it might

actually be able to occur. The school system is not

the only institutionally defined system against

which this kind of criticism can be leveled, of

course. Education, even considered as the formal learn- ing process, takes place not simply in school but in other contexts as well. One of the easiest cases to

illustrate is homework— part of the formal learning

process that occurs in an institution other than the

school. If the home environment is so overcrowded

and noisy that homework cannot be done

thoughtfully, and if, in fact, it is important that homework be done thoughtfully, then either (1) the

education system will have to compensate for this disfunction by altered programs, (2) the education

system will have to amend its performance objectives to be consistent with the performance constraints (the home environment among others) or

(3) some other system will have to bear the cost of

the education system's unmet performance objectives. The principle of conservation within a closed

system, rather than being obscured and disguised,
THE ROLE OF THE PERFORMANCE CONCEPT IN URBAN SYSTEMS 119

is now made clear. Although this may seem to emphasize a massive and rather serious failure, I feel it to be essentially a positive step.

We now recognize that learning is something

much more (and much less) than what formally oc- curs inside the walls of a school building. It is a phenomenon that may well involve the standard

school trips to the zoo and visits to the local art museum but it runs well beyond these too. A per- formance concept of education would measure the

effectiveness of a formal learning system by

whether educated people are actually produced,

rather than by such secondary indices as student-teacher ratios, spending per pupil, new

facilities per year, or racial ratios. One suspects this performance approach, particularly with respect to education, would be brutally honest. It would in- dicate the true cost of not delivering required per- formance by measuring the marginal costs that would be incurred as disfunctions in other systems.

This concept of inter-system tradeoffs and impacts is a rather complex modeling problem, certainly, but the performance concept offers a basis

for continuing to work on it.

Next Steps

In addition to the need for orienting planning and

design education along performance lines there are three directions for further work that are clear at

this time.

First, it is necessary to expand on characteristics

of the 27 operating urban systems. Of interest is the

interaction between various operating systems as well as that between any given operating system

' and the development process which would bring it

i into operation. These linkages are admittedly complex but in the end will probably seem less so than

the way we currently proceed to plan and to design

urban systems without a clear understanding of the

I relationships.

Secondly, it appears very important to evolve

ways in which a diverse group of people having

various design resources can participate in a performance-oriented process for designing urban

systems. Here we would attempt to program how

architects, planners, economists, sociologists,

management specialists, and others could best in- teract in a performance context. The performance

concept offers a way to deal with the component

design problems lying within a complex per- formance profile such as is found in urban systems.

At the same time it appears to offer a way to establish design responsibilities in a team which

derive from the characteristics of the problem and

not from the artificial divisions of academic or

professional disciplines.

Third, it is vital to apply the urban performance

concept to the solution of real problems. A

sequence of decisions and investigations which may

appear logical when originally programmed may

turn out not to correspond to the structure of an ac- tual design problem. This can be learned only by

feedback from a real design situation. There are

several especially useful problem areas in which

this concept can be applied — new community

planning and development, major urban renewal

projects, planning and development of individual

major urban systems, (housing, transportation, education), perhaps Model Cities, and programs like HUD's current in-city housing experimentation

program.

Conclusion

The area of performance design is currently

marked by a reasonably good understanding of the

performance concept but very little understanding

as yet of actual structures for delivering and insuring desired performance. These structures can be

evolved only through experience with designing

real urban systems. Throughout this effort it should

be remembered that the real issue in urban design

is neither physically pretty cities nor complex

problem models of great elegance. The real issue in urban design is performance — the performance of

generically defined, fully functioning delivery

systems for services in urban areas.
i
CONFERENCE IMPRESSIONS AND COMMENTS

William A. Allen

Bickerdike, Allen, Rich & Partners 57 Russell Square, London WCI

As something of a special guest from afar let me

take this, my first public opportunity, to do some

thanking. First it must be to Mr. Eberhard himself,

and to Dr. Wright, for the opportunity to participate

in this new building research activity at the Bureau,

then to Dr. Kushner for his original and continuing

interest, and to Dr. Walton for including me in the

Conference program. These and many others have

made me their proud friend. Now to business, and I begin with some impressions. We have had elegance, led off by Mr. Eberhard's

valued paper. There has been vividness and wide

scope, ranging through the spectrum from the tacti- cal detail of Mr. Robinson and Mr. Achenbach to the larger strategy of Mr. Bush, Mr. Collison and

Dr. Wright. And there has been depth in the discussion of the derivative philosophy, vital in the early

development of such an idea as we have been ex- amining. Dr. Walton and Dr. Cadoff have struc- tured the Conference with great skill. Mr. Eberhard and Mr. Brill identified the situa- tion; we sense a gathering momentum of change. As

Mr. Brill said, "It is an evolution so rapid as to be

a revolution."

In this situation, comprehensive research is essential. There is no opportunity for feedback in conventional ways from ordinary experience, which

formerly could correct the mistakes we make before

they went too far. Now instead we have to observe

accurately and analyze and feedback quickly.

There are always people in the world who hope

that the pace of innovation and development will not be too great for them to cope with, but there is

I no safety today in standing still. 1 think one ought

to be quite clear about this. Whether in the last few

days here, or elsewhere in these last few months or

years we have accurately defined the changing

situation is not important. We won't know for ten or twenty years whether we are in fact seeing it ab- solutely correctly; but we can say this much confidently, that there is no safety now in avoiding

change.

One particularly relevant point is the tremendous

capacity today of industry and of organizational

techniques to do vast things rapidly. It is the

pace-maker of our situation; and it underlines why

we need rapid and accurate feedback, because we

can make bigger mistakes so rapidly. This is only

possible now by the techniques and methodology of

science and we therefore have a situation which is created by science and scientific technology which

can only be managed by science and scientific technology. You can build wrong things today just as rapidly as you can build right ones, but they can

be much bigger than before; so urgency is upon us, and the stage is set. We are dealing with performance specifications

as a concept and this is no isolated fragment of the

present situation; it is central to our means of deal- ing with it. Performance specifications are a state- ment of what is needed, a statement about the market. If the building industry, in which I include its component makers and the relevant professions,

had a collective capacity to order a market

research, it would have to order something like what we have been discussing these last few days.

And this seems to me to identify the character of

the concept very clearly, not only for the many in- dividual industries who make up the building industry, but for the building professions as well. But this

is just another way of saying again that we have to deal with a situation which we have to monitor, for our individual needs and for the larger purposes of

social management of a great nation's affairs. So I say that if industry had the collective capacity to ask for what is urgently needed to confront

today's situation, it would ask for what we are talk- ing about. But the operation today is so big, it in- volves such a vast industry, it involves such a vast country, it is so fundamental to the welfare and

economy of nations, that industry cannot in fact, do

it alone. It cannot just commission it like that. Government cannot stand aside, nor can government do it alone, as Mr. Bush pointed out. It is in- evitably a joint operation.

The people of the country and their well-being,

and the economy of the country is at stake in mat121
122 PERFORMANCE OF BUILDINGS- CONCEPT AND MEASUREMENT

ters of this kind. We are dealing with what is collec- tively the biggest industry in the country, and since

this is the greatest country in the world, we are deal- ing presumably with the biggest industry in the

world. But in this situation, there are a number of

very unexpected peculiarities for which we have to be on the watch. We have to be able to confront some of them with intellectural courage, because

they may cut across our conventions.

The client, in this case is the people involved. We

are creating an environment as Mr. Eberhard said,

"for peoples' ordinary human activities;" and as Mr. Mitchell added, "It is the non-verbal mass of

the people with whom we are dealing." In this room we are a collection of relatively intelligent

human beings. We are verbal, literate, numerate.

We can express our views and we have means of

expressing our views to places of power.

Very large numbers of people have no such

capacity to express themselves, collectively or in- dividually, and this is where we have to confront a new kind of social situation. We are committed to providing adequate living conditions for huge numbers of people whom we designers, manufacturers

and builders will never meet except by accident. We

can't go along to them individually and say "what do

you want?" We have to discover what these clients' needs are by the processes of science.

Now in a great many cases, as we have seen, we

are developing criteria, frequently new criteria or

criteria more accurately specified than formerly,

and we use the methods of science. But has it ever

struck you, that in many cases we simply have not

yet got the tools of measurement? Think of all the

things which you ask for in a building design.

Suppose for example that you have got a so- phisticated client in front of you. Perhaps he wants

a concert hall, or something of that sort. He will say, well of course I want a successful concert

hall, one that is going to be acoustically good for music, popular, with a sense of occasion. What is musically good? The people who are going to be

critical about this are not only the audience, but

the musicians as well. What does musically good

actually mean to them? You say "I want warmth

of tone;" but what are the physical parameters of

warmth of tone? Critics talk about it but they have

no means of expressing such things in physical

terms. We simply don't know yet what warmth of tone is, or brilliance, or any of half a dozen such

factors, even though they are what concert halls are all about. We have no means of going back and

discovering what these things are, because we

don't know what we are measuring and we have

not got techniques for it. There is in fact a general necessity over quite

large areas of building technology to have tools whereby we can indirectly observe whether we

have met our clients' instructions and their needs.

And the more sophisticated the expression of the

requirements, the more acute is the need to find some way of determining, for the purposes of feedback, whether or not we have met our clients' requirements.

Now I said a moment ago, as others too have

said, that a dynamic state of affairs is developing. I said there is no safety in standing still, and in fact there is danger in doing so, for manufacturers, for builders, for professions. But if one cannot stand

still, then it is vital to know where to go, and this too comes back to performance specifications, for they

are supposed to be statements on everybody's be- half of where we ought to be going. I'm sure this point needs no elaboration.

Let me turn now to another aspect which seems

to me especially important in this country. We

recognize now that, despite the great achievement

of a great many people in codifying and standardizing a great many things in which it is necessary to be

systematic; one can't stand still, and the conventional code is a definition of a static state of affairs,

the requirements of some given moment. As we see

it now, codes and standards incorrectly devised, can add up to being a barrier to change. In fact,

building regulations and building codes have often

been the greatest barriers to innovations. They are intended to protect the public, but they can define

together a situation about the market which can

restrict what industry can profitably produce and

offer to the public. If you write a code requirement

that says a party wall must be nine inches thick, in brickwork, then you don't get very much opportunity for an innovation. If on the other hand, you say

that it's got to have one hour's fire resistance and

48db. average sound reduction, (forgive me if I do

not go into details) then you have something in the

way of a performance statement, and this can be a

real release of competition. And it becomes

meaningful in the public and responsible sense, because we are competing to offer a variety of

goods and services against known needs of our

clients. In the ethos of America this surely goes to the root of its strength, that competition is the fun- damental stimulus to service and invention. What
CONFERENCE IMPRESSIONS AND COMMENTS 123 one is concerned about is only that the competition

should lead quickly to good results. So much then for performance specifications and

my comments on them. You see I'm not summarizing anything in this conference; 1 so seldom do the

things I'm asked to do, that I wonder 1 am ever asked to return. I'm merely commenting on things

that came to my mind as we discussed our affairs these last few days.

Now, as Mr. Eberhard said, as Dr. Wright

developed, and others have still further enlarged,

the Bureau here is traditionally and centrally con- cerned with measurement. We have to understand,

as Mr. Cullen reminded us, quoting Lord Kelvin,

that "we only begin to understand when we begin to measure, and we only fully understand when we

have fully measured." The uniqueness of our

problem, and the uniqueness therefore of the Bureau's problem — and here they have almost a psychopathic problem — is that they have to begin

to measure non-objective things. This seldom at- tracts scientists at first sight; how on earth to define

and measure warmth of tone! They have to begin

to measure people — their needs and their desires —

more consistently and purposefully than has ever been done before. Sociologists have been

working at this subject for ages, but often simply

contemplating their navels, oscillating between observed situations and hypotheses, and back to observed situations to confirm the hypotheses, seldom

or never going through the cycle of participating in building exactly what their hypothesis postulated in order to verify its validity. We have drawn boundaries in the wrong place around much of our research

about building design, and around much of our practice. Because we are human beings we suppose we know what other human beings en masse want or

need. It is arrogant of us, when we should be humble in our ignorance.

John Eberhard took us through a very elegant

description of the increasing accuracy of measurement. I was fascinated by this. How the edge of the

dot had to be defined more accurately because you

found it was rough when you examined it closely.

Then the dot was discovered actually to be composed of a whole lot of molecules — other dots; and

then these molecules were found in turn to be composed of a whole lot of much smaller things than

molecules. Indeed, in the end, these probably come

out to be bundles of energy based upon probabilities.Now, in fact, if you look at a family as a dot, this

is what has got to happen to our study of it. This is what faces the Bureau, and it faces other people

who are going to be involved in large-scale, low-in- come housing. The unknown household — we heard

about the eight children and Mama who doesn't

have a husband. We know something about the

edges of such dots, but we now have to know much

more about those eight children and Mama and

what has happened to Papa, and we have to know

much more of what kinds of living conditions they

want or need.

There have been some useful statements about

this. The gentleman from the National Association

of Home Builders also said some very interesting

things to me privately about what they had found to be the real interests of some families — the kinds of

ideas they had about how far above their immediate

social position they felt that they could aim or wanted to aim in their level of housing. There were

certain things which were really important to them,

and again certain things that they wanted only in their imagination. They separated them when faced

with the real prospect of having them if they wished

to pay for them. This is not too surprising, of

course, but it is the kind of fact that should warn us not to project our own aspirations unthinkingly into the situations of others without study. We simply do

not know a great deal about the kind of person I now have in mind.

I dare say that you, like I, occasionally look at the

television and yet for the most part we do not need

it to occupy our minds. We view selectively. Huge

numbers of peoples on the other hand, have to have

their minds filled from outside. The non-verbal mass of society are the people for whom we are in danger of misinterpreting things if we merely try to offer them what in our experience are our own

aspirations or possessions. They may not be theirs. In fact they seldom are. We are ignorant about

many housing needs, and ought to be energetic in overcoming this. And of course it is not just the household; it's the

collectivity of households that make a community.

What is a community? As a bunch of do-gooders we

build community centers. The real community

center is likely to be the department store or shopping center. I imagine James Rouse is right

about this. A city is like a house and a house is like a city,

and that dot of Mr. Eberhard's has got to be carefully explored. Another special aspect of per- formance specifications is the necessity to be both

332-247 0 - 69 -9
124 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

comprehensive and balanced, because it is dangerous to have gaps or to be out of balance. It's very

simple; gaps and imbalance destroy credibility to the user. Everybody knows that there is very little point indeed of having a motor car that is designed

with four wheels if you only have three of them. It destroys the credibility of the thing as a vehicle to drive; but as Dr. Wright said, we are frequently still at the narrative stage of measurement of our per- formance requirements; and as Mr. Achenbach and

Mr. Robinson and others demonstrated yesterday,

it still is exceedingly difficult to be comprehensive

or even to know when you have been comprehensive, even in the single specification, let alone an

area of performance specifications; and without

being comprehensive you can't be balanced.

I remember when I was just a little kiddie in the

Building Research Station in England, I had a very

electrifying boss from whom I learned a great deal. He and I were out on a job once and he said, "Let us drop in on my father for the night; it will be simpler

than staying at a pub." His father was then a rather

elderly man. He had been a builder, and as a builder

he had been very successful. He had built himself

a very comfortable house, and among the things he

had built for himself in this very personal house was

a teak bathtub. He liked the idea of being in contact with wood. He liked its sense of warmth. He retired

rather early that evening, and as we sat downstairs,

drinking a little and discussing where we had been

and what we had seen that day, there was a great

crash from the kitchen. We rushed out there to find

his legs dangling through the ceiling and the bath

water coming down past them. He had forgotten one thing about his performance specification; he

hadn't allowed very much for durability. So it is dif- ficult to be comprehensive.

Seriously it is very important not to leave gaps

and I would like to say— I would like to really

urge — as an architect speaking now to my scientific friends: we don't want gaps left there because we

don't know when they aren't there. It is necessary

at least to identify them and include them even if it

is only by narrative, or by speculation, or judgment,

or by the roughest of measurements. Not all things can be measured equally well yet, and we cannot

wait for them to be measured equally well.

I put this rather strongly partly, at least, because

if one only describes what is well-measured, its solidity throws less well-measured things into such

contrast that their real importance can easily be

misjudged. What can now only be covered by narrative may in five or ten years be shown to be the

thing that matters most. Before the war all lighfing

goals were higher numbers of foot-candles — a sort of foot-and-candle disease — because this was what

could be measured and predicted. We could not

evaluate and did not understand glare and visual

performance, which we now know to be more important. This is a good example of what I mean. For the professional man, this comes down to how robustly he can maintain his judgment in the

face of the glaring power of science, and this is very, very important, because judgment is the basis of

professional activity and responsibility. And it highlights this one danger of science — its strength

and solidity. When a piece of knowledge is consolidated, it has the durability to last perhaps for- ever; but it's not the totality of a real-life situation. In fact we are not likely in our time ever to have the

totality of knowledge laid bare by science — which

is perhaps fortunate for scientists because they

wouldn't have any jobs; but seriously, it is very important for us in the industry, and for professional

people, and for scientists for their part, to recognize

this danger that if they restrict themselves only to those things which they know, and don't even tell us of what they only think they know, then we may

be very seriously misled, with the best intentions in the world. To the professional man or a person in industry a part-answer is no answer at all, and we

ask for a special effort to step beyond the ethos of

strict science, where one is concerned only with those

things which have been established with certainty,

into the world of speculation and narrative when

these are the only means of bridging a gap. So performance specifications may be uneven

things for some considerable time, and I guess we

all know it in the reality of our experience. But it is one reason why in some of the advice I was

privileged to offer the Bureau in the development of

its building research program, I expressed the hope

that they would be able to establish a fine mix of

professional and scientific and industrial minds,

because it is in this balance I think the value of their

work can be maximized.

At this point I would like to recall Dr. Foster's contribution in his discussion of the agrement situation, because the agrement system really is a recognition that you cannot state things fully at some

given moment, and yet you have to get on and you

don't want to leave big omissions; so you cover them by probabilities, by statements of what is be- lieved rather than what is known.
CONFERENCE IMPRESSIONS AND COMMENTS 125

Mr. Achenbach came out in one or two of his re- marks about the difficulty and the cost of field work. I was able to make one or two suggestions

about this, and the Division of Building Research

is developing its field work vigorously. The fact is that one cannot sit in a laboratory and do a fully

realistic job in this area of research. It is necessary

to work in the field. A great deal of experience, a

great deal of knowledge in the form of experience,

is wrapped up in industry and in the work of the

building professions, and only direct contact with

the face of the work will make it a research

resource. It perhaps seems expensive, but really

only in the sense that it is unfamiliar. It is no part of our traditional idea of the costs of research in building. One is expected to pay $25 , $50, or $80,000 for an electron microscope. It is less familiar to spend

the same sort of money on a mobile laboratory. It's even regarded as almost a waste of time to go

somewhere and just contemplate a thing, or to talk to people or to use sample surveying techniques for

technological purposes. So I believe, as I know Mr.

Achenbach does, that this kind of work simply has

to be done. This is the market research of the building industry. Dr. Wright talked about another aspect of measurement when he talked about the subjective and

objective. People often despise — some scientists es- pecially despise— subjective measurements simply

because they aren't objective.

When we are measuring objects, objectivity is dead right. When we are studying people, we are

ipso facto studying things subjectively. We are studying what goes on in the mind, in the sensory

system. We are studying other things about peo- ple—behavioral habits, desires — often suppressed

or unknown desires. If you haven't experienced

something, perhaps you don't know what an asset

it could be in your life. Subjective measurements

which are so frequently derided are likely in building to be part of the ultimate reality. The criteria of

good musical acoustics are musical; they are subjective and it is hard to make them objective. They

are not of the objective nature of things, and call for a different kind of appraisal, characterized by

probability. But probability is no disgrace in science. It is in fact one of the fundamental concepts of science; and when we are involved with

people, we are involved with subjectivity.

We talk about things like houses, and households,

but man and his shelter is our subject; and even

with a careful choice of words I'm in danger of circumscribing the view that we ought to take. The home and its environment. We think of a house, we think of a highrise building with an apartment in it, we think of homes for people. People

often haven't homes. They must have homes and we say they must have respectable homes, and we

think of respectable homes as being the right kind

of stove, the right kind of heafing system, the right

kind of thermal insulation, the right kind of space. We relate this largely to comfort and to status symbols. Man cannot live by bread alone, but by the grace

of God. A technically good house is one thing, but

its environment is another, and it is easy enough to see in many, many parts of the world — not least per- haps in some of your own great cities — that a roof over one's head is not enough. One can do bad

housing with good houses; one sees it done often

enough. But people will frequently think affec- tionately of their environment as good housing if they are happy in it, even if the houses themselves

have shortcomings. It is largely the environment in which a home is set that makes it a success or

failure. This came through in several of the things that

Mr. Bush said this morning and it was implicit in things that we heard about Columbia New Town.

There was a reference to Ebenezer Howard. I live in Welwyn Garden City, the second new town

that he founded, and I know something of what he

believed about environment, because I live in the

result of it. I know that a great many of the houses

are second-rate by good technical standards but I know that the environment is first-rate and that this makes it a place worth living in. I notice that people

would rather not move from their second-rate

houses, they would rather up-grade them and stay,

because of the environment. The street in which

they live, the street into which it leads, the whole

neighborhood has a pleasure about it that lifts the

human spirit. This is important, not to be neglected

when we think of all those things which we can measure easily and accurately. I know a place in Britain where at the moment they are dismantling

a hundred acres of post-war housing. It was put up

in the supposition that a roof over peoples' heads was more-or-less all that mattered; the community

buildings would have to wait, all those things which

represented the graces and pleasures of life would

just have to wait until "necessities" had been

satisfied. Well the place became unpoliceable, the

social costs fantastic; you leave a house vacant and
126 PERFORMANCE OF BUILDINGS — CONCEPT AND MEASUREMENT

before you can say Henry Robinson half of it is taken apart. The whole area is in decay and nobody

knows quite what is wrong and what to do about it.

I think it came out in some of the discussions of

Columbia this morning. Can one afford un- derground utilities? I'm Canadian born; forgive me

then if I come back to this side of the Atlantic for a moment, to recall memories of every Canadian

town, not to mention some in the USA, with a

forest of telegraph poles and wires. Can we afford

underground utilities? Do we have to go on wrecking the environment with this wire-scape? It's one of the things I've had to admire in my adopted

country that practically nothing of that sort ever comes above ground. Somehow or other, they have

managed to afford it. Mr. Mitchell gave us an exhilarating, breathtaking sort of display. It was both a case-history and a model, as I thought, of one of the roles of the Bureau. We had, in fact, a dual performance from

Mitchell and Dr. Pfrang; and in the two we have a capsulated version of just what this conference was

all about. The creation of a system which was an in- novation. The necessity to create something which was adaptable, amendable to peoples' own needs; even to their participation, and the growth problems

of their homes. A lot of human sympathy was writ- ten into the ideas.

The innovation confronted the Bureau and HUD

with a problem, and I thought the discussion of how

it was tackled was fascinating. But the operation

that Mr. Bush described this morning, in which my

friend Mr. Ehrenkrantz has been involved, is of course much the same kind of thing, though on a somewhat larger scale. I think one recognizes in Dr. Walton's assembly of the conference subjects much

skill in picturing the nature of performance specifications alongside that of the problem through these

imaginative and dramatic episodes in your national

development. They are part of the whole family of

ideas with which we are concerned here in this room, and I am sure that everyone can see the

relevance of these examples to their own part in the

total picture.

So I came to my conclusion. Most of you know

the Bureau better than I do, but I am sure you will agree that we have seen it playing a new role in our

industry.

Scientific organizations seldom seek leadership,

but research by its nature moves its participants out

in front, where a sense of direction is rather a necessity. I doubt if the organizers of this Conference had

any leadership aspirations, but I think we are all aware that in putting it together they have somehow

enabled us to discover the line of forward move- ment which is now developing, and to appreciate

the Division's role in making it visible, helping it on, and monitoring it. Not that I am overlooking the part played by

HUD and other government agencies, but there is no time for me to examine the pattern of their in- teraction in these matters, nor am I in any way competent to comment upon it. So, sir, I think that this has been a highly successful meeting. There have been excellent papers and

I and others have learned a great deal. It has been

excellent in every way. And since I am the last speaker, to you Dr. Walton as the senior chairman

and organizer let me say on behalf of everybody

here that we are all greatly indebted to you. To you

therefore, and to Dr. Wright and to the Bureau, and

in retrospect to Mr. Eberhard go our thanks and

appreciation.

* U.S. GOVERNMENT PRINTING OFFICE : 1969 OL —332-247