# PUBLIC PROPOSAL FORM ![](media/image1.png){width="1.1319444444444444in" height="1.4430555555555555in"}

## FOR PUBLIC PROPOSALS ON THE INTERNATIONAL CODES 

## 2003/2004 CODE DEVELOPMENT CYCLE

***PLEASE SEE REVERSE FOR INSTRUCTIONS ON SUBMITTING PUBLIC PROPOSALS.
PROPOSALS MUST COMPLY WITH THESE INSTRUCTIONS.***

> **CLOSING DATE: [All Proposals Must Be Received by March 24,
> 2003]{.underline}.**

1)  **Indicate the format in which you would like to receive your Public
    Proposals Monograph (PPM), Report of the Hearing (ROH) and Final
    Action Agenda (FAA):**

  ------- -- --------- --- ---- -- --------- -- --- -- -----------------------------
  **x**      Paper                 \* CD               \*Download from ICC Website

  ------- -- --------- --- ---- -- --------- -- --- -- -----------------------------

(\*Note: A paper copy will not be sent to you if you have chosen the CD
or Download format.)

**2) PLEASE TYPE OR PRINT CLEARLY: FORMS WILL BE RETURNED if they
contain unreadable information.**

  --------------------------------------------------------------------------------------------------------------------------------
  Name:                                  Ronald Majette                                                      Date:   March 24,
                                                                                                                     2003
  ----------------------- -------------- -------------- ------------ -------- -------- ------ -------------- ------- -------------
  Jurisdiction/Company:                                 U.S.                                                         
                                                        Department                                                   
                                                        of Energy                                                    

  Submitted on Behalf of:                               U.S.                                                         
                                                        Department                                                   
                                                        of Energy                                                    

  Address:                               1000                                                                        
                                         Independence                                                                
                                         Avenue, EE-2J,                                                              
                                         1J-018                                                                      

  City:                   Washington                                 State:   DC       Zip    20585                  
                                                                                       +4:                           

  Phone:                  202-586-7935                               Ext:              Fax:   202-486-4617           
  --------------------------------------------------------------------------------------------------------------------------------

  --------------------------------------------------------------------------
  e-mail:   Ronald.Majette@hq.doe.gov
  --------- ----------------------------------------------------------------

  --------------------------------------------------------------------------

**3) \*Signature:**

\*I hereby grant the International Code Council the nonexclusive,
royalty-free rights, including nonexclusive, royalty-free rights in
copyright in this Proposal and I understand that I acquire no rights in
any publication of International Code Council (ICC), in which this
Proposal in this or another similar analogous form is used. I hereby
attest that I have the authority and I am empowered to grant this
copyright release.

**4)** **Cost Impact:**

**5)** Indicate appropriate International Code(s) associated with this
Public Proposal -- [Please use Acronym]{.underline}:

(See back of this form or the instructions for list of names and
acronyms for the International Codes):

  -------- -------------- ------------- -- ------------- ------------- -- ------- -- ----------- -- ---------- -- -- -- ------------ -------------
  **6)**   **Revision     ** x**           **Section**   ** Various,      ** **      **Table**      ** **               **Figure**   ** **
           to:**                                         Chap 11.**                                                                  

                                                                                                                                     

  **7)**   **PROPOSAL**   **Please                                                                                                   
                          check                                                                                                      
                          appropriate                                                                                                
                          box:**                                                                                                     
  -------- -------------- ------------- -- ------------- ------------- -- ------- -- ----------- -- ---------- -- -- -- ------------ -------------

  -- -- ------------ -- -- -- ------------- -- ------- -- ----------------- -- -- -- --------------------
        **Revise as           **Add new        **X**      **Delete and               **Delete without
        follows:**            text as                     substitute as              Substitution(s):**
                              follows**                   follows:**                 

  -- -- ------------ -- -- -- ------------- -- ------- -- ----------------- -- -- -- --------------------

  -----------------------------------------------------------------------
  **Show the proposed NEW, REVISED or DELETED TEXT in legislative format:
  ~~Line through text to be deleted.~~ [Underline text to be
  added.]{.underline}**

  -----------------------------------------------------------------------

**Section R202**

Delete **"RESIDENTIAL BUILDING TYPE"** without substitution**.**

**Section R202**

Revise the SUNROOM ADDITION definition.

**SUNROOM ~~ADDITION~~ .** A one-story structure ~~added~~
[attached]{.underline} to a~~n existing~~ dwelling with a glazing area
in excess of 40 percent of the gross area of the structure's exterior
walls and roof.

**Section R202**

Delete "THERMAL ISOLATION" and substitute:

**THERMAL ISOLATION.** Physical and space conditioning separation from
conditioned space(s). The conditioned space(s) shall be controlled as
separate zones for heating and cooling or conditioned by separate
equipment.

**Section 318.1**

Revise exception 3.

3\. In counties identified ~~with footnote a in Table N11011.2~~ [as in
climate zones 1 through 5 in Table N1101.2]{.underline}

**R408.2**

Delete all exceptions and add a new Section immediately following.

**Unvented crawl space**. Ventilation openings in under-floor spaces
specified in Sections R408.1 and R408.2 shall not be required where:

1)  Exposed earth is covered with a continuous vapor retarder. All
    joints of the vapor retarder shall overlap by 6 inches (153 mm) and
    shall be sealed or taped. The edges of the vapor retarder shall
    extend at least 6 inches (153 mm) up the stem wall and shall be
    attached to the stem wall,

2)  And one of the following is provided for the under-floor space:

    a.  Continuously operated mechanical exhaust ventilation at a rate
        equal to 1 cfm for each 20 ft^2^ of crawlspace floor area, or

    b.  Conditioned air supply sized to deliver at a rate equal to 1 cfm
        for each 20 ft^2^ of under-floor area, including a return
        pathway (such as a duct or transfer grille to the common area),
        and perimeter walls insulated in accordance with Section
        N1102.2.8, or

    c.  Plenum complying with M1601.4, if under floor spaces used as a
        plenum.

**R806.4**

Add new Section after R806.4

**Conditioned attic assemblies**: Unvented conditioned attic assemblies
(spaces between the ceiling joists of the top story and the roof
rafters) are permitted under the following conditions:

> 1\. No interior vapor retarders are installed on the ceiling side
> (attic floor) of the unvented attic assembly.
>
> 2\. An air-impermeable insulation is applied in direct contact to the
> underside/interior of the structural roof deck. "Air-impermeable"
> shall be defined by ASTM E 283.
>
> 3\. In the warm humid locations as defined in N1101.2.1:
>
> a\. For asphalt roofing shingles: A 1 perm or less vapor retarder
> (determined using Procedure B of ASTM E 96) is placed to the exterior
> of the structural roof deck; i.e. just above the roof structural
> sheathing.
>
> b\. For wood shingles and shakes: a minimum continuous 1/4-inch air
> space separates the shingles/shakes and the roofing felt placed over
> the structural sheathing.
>
> 4\. In zones 3 through 8 as defined in N1101.2 sufficient insulation
> is installed to maintain the monthly average temperature of the
> condensing surface above 45°F. The condensing surface is defined as
> either the structural roof deck or the interior surface of an
> air-impermeable insulation applied in direct contact to the
> underside/interior of the structural roof deck. "Air-impermeable" is
> quantitatively defined by ASTM E 283.For calculation purposes, an
> interior temperature of 68°F is assumed. The exterior temperature is
> assumed to be the monthly average outside temperature.

**R808.1**

Revise.

Recessed lighting fixtures installed in the building thermal envelope
shall meet the requirements of Section ~~N1101.3~~
[N1102.4.3]{.underline}.

# 

# 

# 

# 

#  

# Delete Chapter 11 and substitute:

# CHAPTER 11

# Energy Efficiency

**SECTION N1101**

**GENERAL**

**N1101.1 Scope.** This chapter regulates the energy efficiency for the
design and construction of buildings regulated by this code.

> **Exception:** Portions of the building envelope that do not enclose
> conditioned space.

**N1101.2 Compliance.** Compliance shall be demonstrated by either
meeting the requirement of the *International Energy Conservation Code*
or meeting the requirements of this chapter. Climate zones from Table
N1101.2 shall be used in determining the applicable requirements from
this chapter.

> **N1101.2.1 Warm humid counties.** Warm humid counties are listed in
> Table N1101.2.1.

**N1101.3 Identification.** Materials, systems and equipment shall be
identified in a manner that will allow a determination of compliance
with the applicable provisions of this chapter.

**N1101.4 Building thermal envelope insulation.** An R-value
identification mark shall be applied by the manufacturer to each piece
of building thermal envelope insulation 12 inches (305 mm) or greater in
width. Alternately, the insulation installers shall provide a
certification listing the type, manufacturer and R-value of insulation
installed in each element of the building thermal envelope. For blown or
sprayed insulation, the initial installed thickness, settled thickness,
settled R-value, installed density, coverage area and number of bags
installed shall be listed on the certification. The insulation installer
shall sign, date and post the certification in a conspicuous location on
the job site.

> **N1101.4.1 Blown or sprayed roof/ceiling insulation.** The thickness
> of blown in or sprayed roof/ceiling insulation shall be written in
> inches on markers that are installed at least one for every 300 ft^2^
> (28 m^2^) throughout the attic space. The markers shall be affixed to
> the trusses or joists and marked with the minimum initial installed
> thickness with numbers a minimum of 1 inch (25 mm) in height. Each
> marker shall face the attic access opening.

**N1101.4.2 Insulation mark installation.** Insulating materials shall
be installed such that the manufacturer's R-value mark is readily
observable upon inspection.

**Table N1101.5.**

**Default Glazed Fenestration U-Factors**

+--------------------+----------+------------+----------+------------+
| **Frame Type**     | **Single | **Double   | **Sk     |            |
|                    | Pane**   | Pane**     | ylight** |            |
+--------------------+----------+------------+----------+------------+
|                    |          |            | **       | **Double** |
|                    |          |            | Single** |            |
+--------------------+----------+------------+----------+------------+
| Metal              | 1.20     | 0.80       | 1.60     | 1.05       |
+--------------------+----------+------------+----------+------------+
| Non-Metal          | 0.95     | 0.55       | 1.25     | 0.80       |
|                    |          |            |          |            |
| or metal clad      |          |            |          |            |
+--------------------+----------+------------+----------+------------+
| Glazed Block       | 0.60     |            |          |            |
+--------------------+----------+------------+----------+------------+

**N1101.5 Fenestration product rating.** U-factors of fenestration
products (windows, doors and skylights) shall be determined in
accordance with NFRC 100 by an accredited, independent laboratory, and
labeled and certified by the manufacturer. Products lacking such a
labeled U-factor shall be assigned a default U*-*factor from Table
N1101.5. The solar heat gain coefficient (SHGC) of glazed fenestration
products (windows, glazed doors and skylights) shall be determined in
accordance with NFRC 200 by an accredited, independent laboratory, and
labeled and certified by the manufacturer. Products lacking such a
labeled SHGC shall be assigned a default SHGC of 0.75 for single pane
and 0.65 for double pane and glazed block.

**N1101.6 Installation.** All materials, systems and equipment shall be
installed in accordance with the manufacturer's installation
instructions and the conditions of any listing or required
certifications.

![](media/image2.jpeg){width="7.267361111111111in" height="9.14375in"}

**Figure N1101.2. Climate Zones**

**Table N1101.2** CLIMATE ZONES BY STATE AND COUNTY

**Alabama**

[Zone 3 except]{.underline}

[Zone 2]{.underline}

Baldwin

Mobile

**Alaska**

[Zone 7 except]{.underline}

[Zone 8]{.underline}

Bethel

Dellingham

Fairbanks North Star

Nome

North Slope

Northwest Arctic

Southeast Fairbanks

Wade Hampton

Yukon-Koyukuk

**Arizona**

[Zone 3 except]{.underline}

[Zone 2]{.underline}

La Paz

Maricopa

Pima

Pinal

Yuma

[Zone 4]{.underline}

Gila

Yavapai

[Zone 5]{.underline}

Apache

Coconino

Navajo

**Arkansas**

[Zone 3 except]{.underline}

[Zone 4]{.underline}

Baxter

Benton

Boone

Carroll

Fulton

Izard

Madison

Marion

Newton

Searcy

Stone

Washington

**California**

[Zone 3 Dry except]{.underline}

[Zone 2]{.underline}

Imperial

[Zone 3 Marine]{.underline}

Alameda

Marin

Mendocino

Monterey

Napa

San Benito

San Francisco

San Luis Obispo

San Mateo

Santa Barbara

Santa Clara

Santa Cruz

Sonoma

Ventura

[Zone 4 Dry]{.underline}

Amador

Calaveras

El Dorado

Inyo

Lake

Mariposa

Trinity

Tuolumne

[Zone 4 Marine]{.underline}

Del Norte

Humboldt

[Zone 5]{.underline}

Lassen

Modoc

Nevada

Plumas

Sierra

Siskiyou

[Zone 6]{.underline}

Alpine

Mono

**Colorado**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Baca

Las Animas

Otero

[Zone 6]{.underline}

Alamosa

Archuleta

Chaffee

Conejos

Costilla

Custer

Dolores

Eagle

Moffat

Ouray

Rio Blanco

Saguache

San Miguel

[Zone 7]{.underline}

Clear

Creek

Grand

Gunnison

Hinsdale

Jackson

Lake

Mineral

Park

Pitkin

Rio Grande

Routt

San Juan

Summit

**Connecticut**

[Zone 5]{.underline}

**Delaware**

[Zone 4]{.underline}

**Dist Of Columbia**

[Zone 4]{.underline}

**Florida**

[Zone 2 except]{.underline}

[Zone 1]{.underline}

Broward

Dade

Monroe

**Georgia**

[Zone 3 except]{.underline}

[Zone 2]{.underline}

Appling

Atkinson

Bacon

Baker

Berrien

Brantley

Brooks

Bryan

Camden

Charlton

Chatham

Clinch

Colquitt

Cook

Decatur

Echols

Effingham

Evans

Glynn

Grady

Jeff Davis

Lanier

Liberty

Long

Lowndes

McIntosh

Miller

Mitchell

Pierce

Seminole

Tattnall

Thomas

Toombs

Ware

Wayne

[Zone 4]{.underline}

Banks

Catoosa

Chattooga

Dade

Dawson

Fannin

Floyd

Franklin

Gilmer

Gordon

Habersham

Hall

Lumpkin

Murray

Pickens

Rabun

Stephens

Towns

Union

Walker

White

Whitfield

**Hawaii**

[Zone 1]{.underline}

**Idaho**

[Zone 6 except]{.underline}

[Zone 5]{.underline}

Ada

Benewah

Canyon

Cassia

Clearwater

Elmore

Gem

Gooding

Idaho

Jerome

Kootenai

Latah

Lewis

Lincoln

Minidoka

Nez Perce

Owyhee

Payette

Power

Shoshone

Twin Falls

Washington

**Illinois**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Alexander

Bond

Christian

Clay

Clinton

Crawford

Edwards

Effingham

Fayette

Franklin

Gallatin

Hamilton

Hardin

Jackson

Jasper

Jefferson

Johnson

Lawrence

Macoupin

Madison

Marion

Massac

Monroe

Montgomery

Perry

Pope

Pulaski

Randolph

Richland

Saline

Shelby

St Clair

Union

Wabash

Washington

Wayne

White

Williamson

**Indiana**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Brown

Clark

Crawford

Daviess

Dearborn

Dubois

Floyd

Gibson

Greene

Harrison

Jackson

Jefferson

Jennings

Knox

Lawrence

Martin

Monroe

Ohio

Orange

Perry

Pike

Posey

Ripley

Scott

Spencer

Sullivan

Switzerland

Vanderburgh

Warrick

Washington

**Iowa**

[Zone 5 except]{.underline}

[Zone 6]{.underline}

Allamakee

Black Hawk

Bremer

Buchanan

Buena Vista

Butler

Calhoun

Cerro Gordo

Cherokee

Chickasaw

Clay

Clayton

Delaware

Dickinson

Emmet

Fayette

Floyd

Franklin

Grundy

Hamilton

Hancock

Hardin

Howard

Humboldt

Ida

Kossuth

Lyon

Mitchell

O'Brien

Osceola

Palo Alto

Plymouth

Pocahontas

Sac

Sioux

Webster

Winnebago

Winneshiek

Worth

Wright

**Kansas**

[Zone 4 except]{.underline}

[Zone 5]{.underline}

Cheyenne

Cloud

Decatur

Ellis

Gove

Graham

Greeley

Hamilton

Jewell

Lane

Logan

Mitchell

Ness

Norton

Osborne

Phillips

Rawlins

Republic

Rooks

Scott

Sheridan

Sherman

Smith

Thomas

Trego

Wallace

Wichita

**Kentucky**

[Zone 4]{.underline}

**Louisiana**

[Zone 2 except]{.underline}

[Zone 3]{.underline}

Bienville

Bossier

Caddo

Caldwell

Catahoula

Claiborne

Concordia

De Soto

East Carroll

Franklin

Grant

Jackson

La Salle

Lincoln

Madison

Morehouse Natchitoches

Ouachita

Red River

Richland

Sabine

Tensas

Union

Vernon

Webster

West Carroll

Winn

**Maine**

[Zone 6 except]{.underline}

[Zone 7]{.underline}

Aroostook

**Maryland**

[Zone 4 except]{.underline}

[Zone 5]{.underline} Garrett

**Massachusetts**

[Zone 5]{.underline}

**Michigan**

[Zone 5 except]{.underline}

[Zone 6]{.underline}

Alcona

Alger

Alpena

Antrim

Arenac

Benzie

Charlevoix

Cheboygan

Clare

Crawford

Delta

Dickinson

Emmet

Gladwin

Grand Traverse

Huron

Iosco

Isabella

Kalkaska

Lake

Leelanau

Manistee

Marquette

Mason

Mecosta

Menominee

Missaukee

Montmorency

Newaygo

Oceana

Ogemaw

Oscoda

Otsego

Presque Isle

Roscommon

Sanilac

Wexford

[Zone 7]{.underline}

Baraga

Chippewa

Gogebic

Houghton

Iron

Keweenaw

Luce

Mackinac

Ontonagon

Schoolcraft

**Minnesota**

[Zone 6 except]{.underline}

[Zone 7]{.underline}

Aitkin

Becker

Beltrami

Carlton

Cass

Clay

Clearwater

Cook

Crow Wing

Grant

Hubbard

Itasca

Kanabec

Kittson

Koochiching

Lake Of The Woods Mahnomen

Marshall

Mille Lacs

Norman

Otter Tail

Pennington

Pine

Polk

Red Lake

Roseau

St Louis

Wadena

Wilkin

**Mississippi**

[Zone 3 except]{.underline}

[Zone 2]{.underline}

Hancock

Harrison

Jackson

Pearl River

Stone

**Missouri**

[Zone 4 except]{.underline}

[Zone 5]{.underline}

Adair

Andrew

Atchison

Buchanan

Caldwell

Chariton

Clark

Clinton

Daviess

De Kalb

Gentry

Grundy

Harrison

Holt

Knox

Lewis

Linn

Livingston

Macon

Marion

Mercer

Nodaway

Pike

Putnam

Ralls

Schuyler

Scotland

Shelby

Sullivan

Worth

**Montana**

[Zone 6]{.underline}

**Nebraska**

[Zone 5]{.underline}

**Nevada**

[Zone 5 except]{.underline}

[Zone 3]{.underline}

Clark

**New Hampshire**

[Zone 6 except]{.underline}

[Zone 5]{.underline}

Cheshire

Hillsborough

Rockingham

Strafford

**New Jersey**

[Zone 4 except]{.underline}

[Zone 5]{.underline}

Bergen

Hunterdon

Mercer

Morris

Passaic

Somerset

Sussex

Warren

**New Mexico**

[Zone 4 except]{.underline}

[Zone 3]{.underline}

Chaves

Dona Ana

Eddy

Hidalgo

Lea

Luna

Otero

[Zone 5]{.underline}

Catron

Cibola

Colfax

Harding

Los Alamos

McKinley

Mora

Rio Arriba

San Juan

San Miguel

Sandoval

Santa Fe

Taos

Torrance

**New York**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Bronx

Kings

Nassau

New York

Queens

Richmond

Suffolk

Westchester

[Zone 6]{.underline}

Allegany

Broome

Cattaraugus

Chenango

Clinton

Delaware

Essex

Franklin

Fulton

Hamilton

Herkimer

Jefferson

Lewis

Madison

Montgomery

Oneida

Otsego

Schoharie

Schuyler

St Lawrence

Steuben

Sullivan

Tompkins

Ulster

Warren

Wyoming

**North Carolina**

[Zone 3 except]{.underline}

[Zone 4]{.underline}

Alamance

Alexander

Bertie

Buncombe

Burke

Caldwell

Caswell

Catawba

Chatham

Cherokee

Clay

Cleveland

Davie

Durham

Forsyth

Franklin

Gates

Graham

Granville

Guilford

Halifax

Harnett

Haywood

Henderson

Hertford

Iredell

Jackson

Lee

Lincoln

Macon

Madison

McDowell

Nash

Northampton

Orange

Person

Polk

Rockingham

Rutherford

Stokes

Surry

Swain

Transylvania

Vance

Wake

Warren

Wilkes

Yadkin

[Zone 5]{.underline}

Alleghany

Ashe

Avery

Mitchell

Watauga

Yancey

**North Dakota**

[Zone 7 except]{.underline}

[Zone 6]{.underline}

Adams

Billings

Bowman

Burleigh

Dickey

Dunn

Emmons

Golden Valley

Grant

Hettinger

La Moure

Logan

McIntosh

McKenzie

Mercer

Morton

Oliver

Ransom

Richland

Sargent

Sioux

Slope

Stark

**Ohio**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Adams

Brown

Clermont

Gallia

Hamilton

Lawrence

Pike

Scioto

Washington

**Oklahoma**

[Zone 3 Moist except]{.underline}

[Zone 4 Dry]{.underline}

Beaver

Cimarron

Texas

**Oregon**

[Zone 4 Marine except]{.underline}

[Zone 5 Dry]{.underline}

Baker

Crook

Deschutes

Gilliam

Grant

Harney

Hood River

Jefferson

Klamath

Lake

Malheur

Morrow

Sherman

Umatilla

Union

Wallowa

Wasco

Wheeler

**Pennsylvania**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Bucks

Chester

Delaware

Montgomery

Philadelphia

York

[Zone 6]{.underline}

Cameron

Clearfield

Elk

McKean

Potter

Susquehanna

Tioga

Wayne

**Rhode Island**

[Zone 5]{.underline}

**South Carolina**

[Zone 3]{.underline}

**South Dakota**

[Zone 6 except]{.underline}

[Zone 5]{.underline}

Bennett

Bon Homme

Charles Mix

Clay

Douglas

Gregory

Hutchinson

Jackson

Mellette

Todd

Tripp

Union

Yankton

**Tennessee**

[Zone 4 except]{.underline}

[Zone 3]{.underline}

Chester

Crockett

Dyer

Fayette

Hardeman

Hardin

Haywood

Henderson

Lake

Lauderdale

Madison

McNairy

Shelby

Tipton

**Texas**

[Zone 2 Moist except]{.underline}

[Zone 2 Dry]{.underline}

Bandera

Dimmit

Edwards

Kinney

La Salle

Maverick

Medina

Real

Uvalde

Val Verde

Webb

Zapata

Zavala

[Zone 3 Dry]{.underline}

Andrews

Baylor

Borden

Brewster

Callahan

Childress

Coke

Coleman

Collingsworth

Concho

Cottle

Crane

Crockett

Crosby

Culberson

Dawson

Dickens

Ector

El Paso

Fisher

Foard

Gaines

Garza

Glasscock

Hall

Hardeman

Haskell

Hemphill

Howard

Hudspeth

Irion

Jeff Davis

Jones

Kent

Kerr

Kimble

King

Knox

Loving

Lubbock

Lynn

Martin

Mason

Mcculloch

Menard

Midland

Mitchell

Motley

Nolan

Pecos

Presidio

Reagan

Reeves

Runnels

Schleicher

Scurry

Shackelford

Sterling

Stonewall

Sutton

Taylor

Terrell

Terry

Throckmorton

Tom Green

Ward

Wheeler

Wilbarger

Winkler

[Zone 3 Moist]{.underline}

Archer

Blanco

Bowie

Brown

Burnet

Camp

Cass

Clay

Collin

Comanche

Cooke

Dallas

Delta

Denton

Eastland

Ellis

Erath

Fannin

Franklin

Gillespie

Grayson

Gregg

Hamilton

Harrison

Henderson

Hood

Hopkins

Hunt

Jack

Johnson

Kaufman

Kendall

Lamar

Lampasas

Llano

Montague

Stephens

Wichita

Wise

Young

Marion

Mills

Morris

Nacogdoches

Navarro

Palo

Pinto

Panola

Parker

Rains

Red

River

Rockwall

Rusk

Sabine

San Augustine

San Saba

Shelby

Smith

Somervell

Tarrant

Titus

Upshur

Van Zandt

Wood

[Zone 4]{.underline}

Armstrong

Bailey

Briscoe

Carson

Castro

Cochran

Dallam

Deaf Smith

Donley

Floyd

Gray

Hale

Hansford

Hartley

Hockley

Hutchinson

Lamb

Lipscomb

Moore

Ochiltree

Oldham

Parmer

Potter

Randall

Roberts

Sherman

Swisher

Yoakum

**Utah**

[Zone 5 except]{.underline}

[Zone 3]{.underline}

Washington

[Zone 6]{.underline}

Box Elder

Cache

Carbon

Daggett

Duchesne

Morgan

Rich

Summit

Uintah

Wasatch

**Vermont**

[Zone 6]{.underline}

**Virginia**

[Zone 4]{.underline}

**Washington**

[Zone 4 Marine except]{.underline}

[Zone 5 Dry]{.underline}

Adams

Asotin

Benton

Chelan

Columbia

Douglas

Franklin

Garfield

Grant

Kittitas

Klickitat

Lincoln

San Juan

Skamania

Spokane

Walla Walla

Whitman

Yakima

[Zone 6 Dry]{.underline}

Ferry

Okanogan

Pend

Oreille

Stevens

**West Virginia**

[Zone 5 except]{.underline}

[Zone 4]{.underline}

Berkeley

Boone

Braxton

Cabell

Calhoun

Clay

Gilmer

Jackson

Jefferson

Kanawha

Lincoln

Logan

Mason

McDowell

Mercer

Mingo

Monroe

Morgan

Pleasants

Putnam

Ritchie

Roane

Tyler

Wayne

Wirt

Wood

Wyoming

**Wisconsin**

[Zone 6 except]{.underline}

[Zone 7]{.underline}

Ashland

Bayfield

Burnett

Douglas

Florence

Forest

Iron

Langlade

Lincoln

Oneida

Price

Sawyer

Taylor

Vilas

Washburn

**Wyoming**

[Zone 6 except]{.underline}

[Zone 5]{.underline}

Goshen

Platte

[Zone 7]{.underline}

Lincoln

Sublette

Teto

**Table N1101.2.1 Warm Humid Counties.**

**Alabama**

Autauga

Baldwin

Barbour

Bullock

Butler

Choctaw

Clarke

Coffee

Conecuh

Covington

Crenshaw

Dale

Dallas

Elmore

Escambia

Geneva

Henry

Houston

Lowndes

Macon

Marengo

Mobile

Monroe

Montgomery

Perry

Pike

Russell

Washington

Wilcox

**Arkansas**

Columbia

Hempstead

Lafayette

Little River

Miller

Sevier

Union

**Florida**

[All]{.underline}

**Georgia**

[All in Zone 2]{.underline}

[Plus]{.underline}

Ben Hill

Bleckley

Bulloch

Calhoun

Candler

Chattahoochee

Clay

Coffee

Crisp

Dodge

Dooly

Dougherty

Early

Emanuel

Houston

Irwin

Jenkins

Johnson

Laurens

Lee

Macon

Marion

Montgomery

Peach

Pulaski

Quitman

Randolph

Schley

Screven

Stewart

Sumter

Taylor

Telfair

Terrell

Tift

Treutlen

Turner

Twiggs

Webster

Wheeler

Wilcox

Worth

**Louisiana**

[All in Zone 2]{.underline}

[Plus]{.underline}

Bienville

Bossier

Caddo

Caldwell

Catahoula

Claiborne

Concordia

De Soto

Franklin

Grant

Jackson

La Salle

Lincoln

Madison

Natchitoches

Ouachita

Red River

Richland

Sabine

Tensas

Union

Vernon

Webster

Winn

**Mississippi**

[All in Zone 2]{.underline}

[Plus]{.underline}

Adams

Amite

Claiborne

Copiah

Covington

Forrest

Franklin

George

Greene

Hinds

Jefferson

Jefferson Davis

Jones

Lamar

Lawrence

Lincoln

Marion

Perry

Pike

Rankin

Simpson

Smith

Walthall

Warren

Wayne

Wilkinson

**North Carolina**

Brunswick

Carteret

Columbus

New Hanover

Onslow

Pender

**South Carolina**

Allendale

Bamberg

Barnwell

Beaufort

Berkeley

Charleston

Colleton

Dorchester

Georgetown

Hampton

Horry

Jasper

**Texas**

[All in Zone 2]{.underline}

[Plus]{.underline}

Blanco

Bowie

Brown

Burnet

Camp

Cass

Collin

Comanche

Dallas

Delta

Denton

Ellis

Erath

Franklin

Gillespie

Gregg

Hamilton

Harrison

Henderson

Hood

Hopkins

Hunt

Johnson

Kaufman

Kendall

Lamar

Lampasas

Llano

Marion

Mills

Morris

Nacogdoches

Navarro

Palo

Pinto

Panola

Parker

Rains

Red

River

Rockwall

Rusk

Sabine

San Augustine

San Saba

Shelby

Smith

Somervell

Tarrant

Titus

Upshur

Van Zandt

Wood

**N1101.6.1 Protection of exposed foundation insulation.** Insulation
applied to the exterior of foundation walls and the perimeter of
slab-on-grade floors shall have a rigid, opaque and weather-resistant
protective covering to prevent the degradation of the insulation's
thermal performance. The protective covering shall cover the exposed
exterior insulation and extend a minimum of 6 inches (153 mm) below
grade. **N1101.7 Above code programs.** The building official or other
authority having jurisdiction shall be permitted to deem a national,
state or local energy efficiency program to exceed the energy efficiency
required by this chapter. Buildings approved in writing by such an
energy efficiency program shall be considered in compliance with this
chapter.

**N1101.8 Certificate.** A permanent certificate shall be posted inside
the building on the electrical distribution panel. The certificate shall
be completed by the builder or registered design professional. The
certificate shall list the predominant R-values of insulation installed
in or on ceiling/roof, walls, foundation (slab, basement wall,
crawlspace wall and/or floor) and ducts outside conditioned spaces;
U-factors for fenestration; and, where requirements apply, the solar
heat gain coefficient (SHGC) of fenestration. Where there is more than
one value for each component, the certificate shall list the value
covering the largest area. The certificate shall list the type and
efficiency of heating, cooling and service water heating equipment.

**SECTION N1102**

**BUILDING THERMAL ENVELOPE**

**N1102.1 Insulation and fenestration criteria.**

The building thermal envelope shall meet the requirements of Table
N1102.1 based on the climate zone specified in Table N1102.1.

> **N1102.1.1 R-value computation.** Insulation material used in layers,
> such as framing cavity insulation and insulating sheathing, shall be
> summed to compute the component R-value. The manufacturer's settled
> R-value shall be used for blown insulation. Computed R-values shall
> not include an R-value for other building materials or air films.
>
> **N1102.1.2 U-factor alternative.** An assembly with a U-factor equal
> to or less than that specified in Table N1102.1.2 shall be permitted
> as an alternative to the R-value in Table N1102.1.
>
> **N1102.2Total UA alternative.** If the total building thermal
> envelope UA (sum of U-factor times assembly area) is less than or
> equal to the total UA resulting from using the U-factors in Table
> N1102.1.2, the building shall be considered in compliance with Table
> N1102.1. The UA calculation shall be done using a method consistent
> with the ASHRAE Handbook of Fundamentals and shall include the thermal
> bridging effects of framing materials. The SHGC requirements shall be
> met in addition to UA compliance.
>
> **N1102.1.4 Prescriptive trade offs.** The trade offs specified in
> Table N1102.1.4 shall be permitted as an alternative to Table N1102.1.

**N1102.2 Specific insulation requirements.**

> **N1102.2.1 Ceilings with attic spaces.** When Section N1102.1 would
> require R-38 in the ceiling, R-30 shall be deemed to satisfy the
> requirement for R-38 wherever the full height of uncompressed R-30
> insulation extends over the wall top plate at the eaves. Similarly
> R-38 shall be deemed to satisfy the requirement for R-49 wherever the
> full height of uncompressed R-38 insulation extends over the wall top
> plate at the eaves.
>
> **N1102.2.2 Ceilings without attic spaces.** Where Section N1102.1
> would require insulation levels above R-30 and the design of the
> roof/ceiling assembly does not allow sufficient space for the required
> insulation, the minimum required insulation for such roof/ceiling
> assemblies shall be R-30.
>
> **N1102.2.3 Mass walls.** Mass walls for the purposes this chapter
> shall be considered walls of concrete block, concrete, insulated
> concrete form (ICF), masonry cavity, brick (other than brick veneer),
> earth (adobe, compressed earth block, rammed earth), and solid
> timber/logs. The provisions of Section N1102.1 for mass walls shall be
> applicable when at least 50% of the required insulation R-value is on
> the exterior of, or integral to, the wall. Walls that do not meet this
> criterion for insulation placement shall meet the wood frame wall
> insulation requirements of Section N1102.1.
>
> **N1102.2.4 Steel-frame ceilings, walls and floors.** Steel-frame
> ceilings, walls and floors shall meet the insulation requirements of
> Table N1102.2.4 or shall meet the wall U-factor requirements in Table
> N1102.1.2. The calculation of the U-factor for a steel-frame wall
> shall use a series-parallel path calculation method.
>
> **N1102.2.5 Floors.** Floor insulation shall be installed to maintain
> permanent contact with the underside of the subfloor decking.
>
> **N1102.2.6 Basement walls.** Walls associated with conditioned
> basements shall be insulated from the top of the basement wall down to
> 10 feet below grade or to the basement floor, whichever is less. Walls
> associated with unconditioned basements shall meet this requirement
> unless the floor overhead is insulated in accordance with Sections
> N1102.1 and N1102.2.5.
>
> **N1102.2.7 Slab-on-grade floors.** Slab-on-grade floors with a floor
> surface less than 12 inches below grade shall be insulated in
> accordance with Table N1102.1. The insulation shall extend downward
> from the top of the slab on the outside or inside of the foundation
> wall. Insulation located below grade shall be extended the distance
> provided in Table N1102.1 by any combination of vertical insulation,
> insulation extending under the slab or insulation extending out from
> the building. Insulation extending away from the building shall be
> protected by pavement or by a minimum of 10 inches of soil. The top
> edge of the insulation installed between the exterior wall and the
> edge of the interior slab shall be permitted to be cut at a 45‑degree
> angle away from the exterior wall. Slab-edge insulation is not
> required in jurisdictions designated by the code official as having a
> very heavy termite infestation.
>
> **N1102.2.8 Crawl space walls.** As an alternative to insulating
> floors over crawl spaces, crawl space walls shall be permitted to be
> insulated when the crawl space is not vented to the outside. Crawl
> space wall insulation shall be permanently fastened to the wall and
> extend downward from the floor to the finished grade level and then
> vertically and/or horizontally for at least an additional 24 inches
> (610 mm). Exposed earth in unvented crawl space foundations shall be
> covered with a continuous vapor retarder. All joints of the vapor
> retarder shall overlap by 6 inches (153 mm) and be sealed or taped.
> The edges of the vapor retarder shall extend at least 6 inches (153
> mm) up the stem wall and shall be attached to the stem wall.
>
> **N1102.2.9 Masonry veneer.** Insulation shall not be required on the
> horizontal portion of the foundation that supports a masonry veneer.
>
> **N1102.2.10 Thermally isolated sunroom insulation.** The minimum
> ceiling insulation R-values shall be R-19 in zones 1 through 4 and
> R-24 in zones 5 though 8. The minimum wall R-value shall be R-13 in
> all zones. New wall(s) separating the sunroom from conditioned space
> shall meet the building thermal envelope requirements.
>
> **N1102.3 Fenestration.**
>
> **N1102.3.1 U-factor.** An area-weighted average of fenestration
> products shall be permitted to satisfy the U-factor requirements.
>
> **N1102.3.2 Glazed fenestration SHGC.** An area-weighted average of
> fenestration products more than 50% glazed shall be permitted to
> satisfy the SHGC requirements.
>
> **N1102.3.3 Glazed fenestration exemption.** Up to 15 ft^2^ of glazed
> fenestration per dwelling unit shall be permitted to be exempt from
> U-factor and SHGC requirements in Section N1102.1.
>
> **N1102.3.4 Opaque door exemption.** One opaque door assembly is
> exempted from the U-factor requirement in Section N1102.1.
>
> **N1102.3.5 Thermally isolated sunroom U-factor.** For zones 4 through
> 8 the maximum fenestration U-factor shall be 0.50 and the maximum
> skylight U-factor shall be 0.75. New windows and doors separating the
> sunroom from conditioned space shall meet the building thermal
> envelope requirements.
>
> **N1102.3.6 Replacement fenestration.** Where some or all of an
> existing fenestration unit is replaced with a new fenestration
> product, including frame, sash, and glazing, the replacement
> fenestration unit shall meet the applicable requirements for U-factor
> and SHGC in Table N1102.1.
>
> **N1102.3.7 Impact resistant fenestration.** Jurisdictions in zones 1
> through 4 that require impact resistant fenestration that meets ASTM
> E-1886, ASTM E-1996, or other approved impact standard shall be exempt
> from the fenestration U-factor requirement. Fenestration so exempted
> shall be listed and labeled by the manufacturer as meeting the
> approved impact standard.

**N1102.4 Air leakage.**

> **N1102.4.1 Building thermal envelope.** The building thermal envelope
> shall be durably sealed to limit infiltration. The sealing methods
> between dissimilar materials shall allow for differential expansion
> and contraction. The following shall be caulked, gasketed,
> weatherstripped or otherwise sealed with an air barrier material,
> suitable film or solid material.

1.  All joints, seams and penetrations.

2.  Site-built windows, doors and skylights.

3.  Openings between window and door assemblies and their respective
    jambs and framing.

4.  Utility penetrations.

5.  Dropped ceilings or chases adjacent to the thermal envelope.

6.  Knee walls.

7.  Walls and ceilings separating the garage from conditioned spaces.

8.  Behind tubs and showers on exterior walls.

9.  Common walls between dwelling units.

> 10\. Other sources of infiltration.
>
> **N1102.4.2 Fenestration air leakage.** Windows, skylights and
> sliding-glass doors shall have an air infiltration rate of no more
> than 0.3 cfm/ft^2^, and swinging doors no more than 0.5 cfm/ft2, when
> tested according to NFRC 400, 101/I.S.2, or 101/I.S.2/NAFS by an
> accredited, independent laboratory, and listed and labeled by the
> manufacturer.
>
> **Exemptions:** Site-built windows, skylights and doors.
>
> **N1102.4.3 Recessed lighting.** Recessed lighting fixtures installed
> in the building thermal envelope shall be sealed to limit air leakage
> between conditioned and unconditioned spaces by being:

1.  IC-rated and labeled with enclosures that are sealed or gasketed to
    prevent air leakage to the ceiling cavity or unconditioned space; or

2.  IC-rated and labeled as meeting ASTM E 283 when tested at 1.57 psi
    (75 Pa) pressure differential with no more than 2.0 cfm (0.944 L/s)
    of air movement from the conditioned space to the ceiling cavity; or

3.  located inside an airtight sealed box with clearances of at least
    0.5 inches (12.7 mm) from combustible material and 3 inches (76mm)
    from insulation.

**N1102.5 Moisture control.** The building design shall not create
conditions of accelerated deterioration from moisture condensation.
Frame walls, floors and ceilings not ventilated to allow moisture to
escape shall be provided with an approved vapor retarder. The vapor
retarder shall be installed on the warm-in-winter side of the thermal
insulation.

> **Exceptions:**

1.  In construction where moisture or its freezing will not damage the
    materials.

2.  Frame walls, floors and ceilings in jurisdictions in Zones 1
    through 5. (Crawl space floor vapor retarders are not exempted.)

3.  Where other approved means to avoid condensation are provided.

> **N1102.5.1 Maximum fenestration U-factor.** The maximum fenestration
> U-factor permitted using trade offs from Section N1102.1.3 in zones 6
> through 8 shall be 0.55.

**SECTION N1103**

**SYSTEMS**

**N1103.1 Controls.** At least one thermostat shall be provided for each
separate heating and cooling system.

**N1103.2 Ducts.**

> **N1103.2.1 Insulation.** Supply and return ducts shall be insulated
> to a minimum of R-8. Ducts in floor trusses shall be insulated to a
> minimum of R-6.
>
> **Exception:** Ducts or portions thereof located completely inside the
> building thermal envelope or within the building thermal envelope and
> separated from the exterior of the building thermal envelope with at
> least R-8 insulation.
>
> **N1103.2.2 Sealing.** All ducts, air handlers, filter boxes, and
> building cavities used as ducts shall be sealed. Joints and seams
> shall comply with M1601.3.1.
>
> **N1103.2.3 Building cavities.** Building framing cavities shall not
> be used as supply ducts.

**N1103.3 Mechanical system piping insulation.** Mechanical system
piping capable of carrying fluids above 105 F or below 55 F shall be
insulated to a minimum of R-2.

**N1103.4 Circulating hot water systems.** All circulating service hot
water piping shall be insulated to at least R-2. Circulating hot water
systems shall include an automatic or readily accessible manual switch
that can turn off the hot water circulating pump when the system is not
in use.

**N1103.5 Mechanical ventilation.** Outdoor air intakes and exhausts
shall have automatic or gravity dampers that close when the ventilation
system is not operating.

**N1103.6 Equipment sizing.** Heating and cooling equipment shall be
sized as specified in M1401.3.

**Add new to Section M1303.1**

> 5\. Maintenance instructions. Required regular maintenance actions.
> Title or publication number for the operation and maintenance manual
> for that particular model and type of product.
>
> 6\. Equipment efficiency. Equipment efficiency for heating, cooling
> and service water heating equipment with equipment efficiency
> regulated as an AFUE, HSPF, SEER or EF.

**Exception:** Equipment assembled in the field.

**Section AJ102.4.**

**Replacement windows.** Regardless of the category of work, when an
entire existing window, including frame, sash and glazed portion is
replaced, the replacement window shall comply with the requirements of
~~Section 1102.4~~ [Chapter 11]{.underline}.

### Table N1102.1. Insulation and Fenestration Requirements by Component^(a)^

<table>
<colgroup>
<col style="width: 7%" />
<col style="width: 10%" />
<col style="width: 9%" />
<col style="width: 10%" />
<col style="width: 9%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 10%" />
<col style="width: 7%" />
<col style="width: 11%" />
</colgroup>
<tbody>
<tr class="odd">
<td><strong>Climate Zone</strong></td>
<td><strong>Fenestration U‑Factor</strong></td>
<td><p><strong>Skylight<sup>(b)</sup></strong></p>
<p><strong>U-Factor</strong></p></td>
<td><p><strong>Glazed</strong></p>
<p><strong>Fenestration</strong></p>
<p><strong>SHGC</strong></p></td>
<td><p><strong>Ceiling</strong></p>
<p><strong>R-Value</strong></p></td>
<td><p><strong>Wood</strong></p>
<p><strong>Frame Wall</strong></p>
<p><strong>R-Value</strong></p></td>
<td><p><strong>Mass Wall</strong></p>
<p><strong>R-Value</strong></p></td>
<td><p><strong>Floor</strong></p>
<p><strong>R-Value</strong></p></td>
<td><p><strong>Basement<sup>(c)</sup></strong></p>
<p><strong>Wall R‑Value</strong></p></td>
<td><p><strong>Slab<sup>(d)</sup></strong></p>
<p><strong>R-Value &amp; Depth</strong></p></td>
<td><strong>Crawl Space<sup>(c)</sup> Wall R-Value</strong></td>
</tr>
<tr class="even">
<td>1</td>
<td>1.20</td>
<td>1.60</td>
<td>0.40</td>
<td>30</td>
<td>13</td>
<td>6</td>
<td>13</td>
<td>0</td>
<td>0</td>
<td>0</td>
</tr>
<tr class="odd">
<td>2</td>
<td>0.80</td>
<td>1.05</td>
<td>0.40</td>
<td>30</td>
<td>13</td>
<td>6</td>
<td>13</td>
<td>0</td>
<td>0</td>
<td>0</td>
</tr>
<tr class="even">
<td>3</td>
<td>0.60</td>
<td>0.90</td>
<td>0.40<sup>(e)</sup></td>
<td>30</td>
<td>13</td>
<td>6</td>
<td>19</td>
<td>0</td>
<td>0</td>
<td>5/13</td>
</tr>
<tr class="odd">
<td>4 except Marine</td>
<td>0.40</td>
<td>0.60</td>
<td>NR</td>
<td>38</td>
<td>13</td>
<td>8</td>
<td>19</td>
<td>10 / 13</td>
<td>10, 2 ft</td>
<td>10 / 13</td>
</tr>
<tr class="even">
<td><p>5 and</p>
<p>Marine 4</p></td>
<td>0.35</td>
<td>0.60</td>
<td>NR</td>
<td>38</td>
<td>19 or 13+5<strong><sup>(g)</sup></strong></td>
<td>13</td>
<td>25<sup>(f)</sup></td>
<td>10 / 13</td>
<td>10, 2 ft</td>
<td>10 / 13</td>
</tr>
<tr class="odd">
<td>6</td>
<td>0.35</td>
<td>0.60</td>
<td>NR</td>
<td>49</td>
<td>19 or 13+5<strong><sup>(g)</sup></strong></td>
<td>15</td>
<td>30<sup>(f)</sup></td>
<td>10 / 13</td>
<td>10, 4 ft</td>
<td>10 / 13</td>
</tr>
<tr class="even">
<td>7 and 8</td>
<td>0.35</td>
<td>0.60</td>
<td>NR</td>
<td>49</td>
<td>21</td>
<td>21</td>
<td>30<sup>(f)</sup></td>
<td>15 / 21</td>
<td>15, 4 ft</td>
<td>10 / 13</td>
</tr>
<tr class="odd">
<td colspan="11"><p>(a) R-values are minimums. U-factors and SHGC are
maximums. R-19 shall be permitted to be compressed into a 2x6
cavity.</p>
<p>(b) The fenestration U-factor column excludes skylights. The SHGC
column applies to all glazed fenestration.</p>
<p>(c) The first R-value applies to continuous insulation, the second to
framing cavity insulation; either insulation meets the requirement.</p>
<p>(d) R-5 shall be added to the required slab edge R-values for heated
slabs.</p>
<p>(e) There are no SHGC requirements in the Marine zone.</p>
<p>(f) Or insulation sufficient to fill the framing cavity, R-19
minimum.</p>
<p>(g) “13+5” means R-13 cavity insulation plus R-5 insulated sheathing.
If structural sheathing covers 25% or less of the exterior, R-5
sheathing is not required where structural sheathing is used. If
structural sheathing covers more than 25% of exterior, structural
sheathing shall be supplemented with insulated sheathing of at least
R-2.</p></td>
</tr>
</tbody>
</table>

### Table N1102.1.2. Equivalent U-Factors^(a)^

+--------+------+------+-----+------+------+-----+--------+---------+
| **C    | **   | **Sk | **  | **F  | **   | **F | **Base | **Crawl |
| limate | Fene | ylig | Cei | rame | Mass | loo | ment** | Space   |
| Zone** | stra | ht** | lin | Wa   | Wa   | r** |        | Wall    |
|        | tion |      | g** | ll** | ll** |     | **Wall | U-F     |
|        | U‑   | **U‑ |     |      |      | **U | U-Fa   | actor** |
|        | Fact | Fact | **U | **U- | **U- | -Fa | ctor** |         |
|        | or** | or** | -Fa | Fact | Fact | cto |        |         |
|        |      |      | cto | or** | or** | r** |        |         |
|        |      |      | r** |      |      |     |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 1      | 1.20 | 1.60 | 0.  | 0    | 0    | 0.  | 0.360  | 0.477   |
|        |      |      | 035 | .082 | .110 | 064 |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 2      | 0.80 | 1.05 | 0.  | 0    | 0    | 0.  | 0.360  | 0.477   |
|        |      |      | 035 | .082 | .110 | 064 |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 3      | 0.60 | 0.90 | 0.  | 0    | 0    | 0.  | 0.360  | 0.136   |
|        |      |      | 035 | .082 | .110 | 047 |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 4      | 0.40 | 0.60 | 0.  | 0    | 0    | 0.  | 0.059  | 0.065   |
| except |      |      | 030 | .082 | .099 | 047 |        |         |
| Marine |      |      |     |      |      |     |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 5 and  | 0.35 | 0.60 | 0.  | 0    | 0    | 0.  | 0.059  | 0.065   |
| Marine |      |      | 030 | .060 | .082 | 037 |        |         |
| 4      |      |      |     |      |      |     |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 6      | 0.35 | 0.60 | 0.  | 0    | 0    | 0.  | 0.059  | 0.065   |
|        |      |      | 026 | .060 | .077 | 033 |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| 7 and  | 0.35 | 0.60 | 0.  | 0    | 0    | 0.  | 0.041  | 0.057   |
| 8      |      |      | 026 | .057 | .057 | 033 |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+
| \(a\)  |      |      |     |      |      |     |        |         |
| Non-   |      |      |     |      |      |     |        |         |
| fenest |      |      |     |      |      |     |        |         |
| ration |      |      |     |      |      |     |        |         |
| U-f    |      |      |     |      |      |     |        |         |
| actors |      |      |     |      |      |     |        |         |
| shall  |      |      |     |      |      |     |        |         |
| be     |      |      |     |      |      |     |        |         |
| ob     |      |      |     |      |      |     |        |         |
| tained |      |      |     |      |      |     |        |         |
| from   |      |      |     |      |      |     |        |         |
| measur |      |      |     |      |      |     |        |         |
| ement, |      |      |     |      |      |     |        |         |
| calcu  |      |      |     |      |      |     |        |         |
| lation |      |      |     |      |      |     |        |         |
| or an  |      |      |     |      |      |     |        |         |
| ap     |      |      |     |      |      |     |        |         |
| proved |      |      |     |      |      |     |        |         |
| s      |      |      |     |      |      |     |        |         |
| ource. |      |      |     |      |      |     |        |         |
+--------+------+------+-----+------+------+-----+--------+---------+

**Table N1102.2.4. Steel-Frame Ceiling, Wall and Floor Insulation
(R-Value)**

+--------------------+-------------------------------------------------+
| **Wood Frame**     | **Cold-Formed Steel Equivalent R --Value^1^**   |
|                    |                                                 |
| **R-Value          |                                                 |
| Requirement**      |                                                 |
+--------------------+-------------------------------------------------+
| **Steel Truss      |                                                 |
| Ceilings^2^**      |                                                 |
+--------------------+-------------------------------------------------+
| R-30               | R-38 or R-30+3 or R-26+5                        |
+--------------------+-------------------------------------------------+
| R-38               | R-49 or R-38+3                                  |
+--------------------+-------------------------------------------------+
| R-49               | R-38+5                                          |
+--------------------+-------------------------------------------------+
| **Steel Joist      |                                                 |
| Ceilings^2^**      |                                                 |
+--------------------+-------------------------------------------------+
| R-30               | R-38 in 2x4 or 2x6 or 2x8                       |
|                    |                                                 |
|                    | R-49 in any framing                             |
+--------------------+-------------------------------------------------+
| R-38               | R-49 in 2x4 or 2x6 or 2x8 or 2x10               |
+--------------------+-------------------------------------------------+
| ######             |                                                 |
|  Steel Framed Wall |                                                 |
+--------------------+-------------------------------------------------+
| R-13               | R-13+5 or R-15+4 or R-21+3                      |
+--------------------+-------------------------------------------------+
| R-19               | R-13+9 or R-19+8 or R-25+7                      |
+--------------------+-------------------------------------------------+
| R-21               | R-13+10 or R-19+9 or R-25+8                     |
+--------------------+-------------------------------------------------+
| ######             |                                                 |
|  Steel Joist Floor |                                                 |
+--------------------+-------------------------------------------------+
| R-13               | R-19 in 2x6                                     |
|                    |                                                 |
|                    | R-19+R6 in 2x8 or 2x10                          |
+--------------------+-------------------------------------------------+
| R-19               | R-19+R-6 in 2x6                                 |
|                    |                                                 |
|                    | R-19+R-12 in 2x8 or 2x10                        |
+--------------------+-------------------------------------------------+
| Notes:             |                                                 |
|                    |                                                 |
| 1\. Cavity         |                                                 |
| insulation R-value |                                                 |
| is listed first,   |                                                 |
| followed by        |                                                 |
| continuous         |                                                 |
| insulation         |                                                 |
| R-value.           |                                                 |
|                    |                                                 |
| 2\. Insulation     |                                                 |
| exceeding the      |                                                 |
| height of the      |                                                 |
| framing shall      |                                                 |
| cover the framing. |                                                 |
+--------------------+-------------------------------------------------+

**Table N1102.1.4. HVAC System Tradeoffs**

+------+---------------------------------+----------------------------+
| *    | **Required Improvement for HVAC | **Allowed Alternatives for |
| *Cli | System**                        | In                         |
| mate |                                 | sulation/Fenestration^1^** |
| Z    |                                 |                            |
| one( |                                 |                            |
| s)** |                                 |                            |
+======+=================================+============================+
| 2    | > SEER 13 **OR**                | > Any fenestration         |
|      | >                               | > U-factor                 |
|      | > Ducts & HVAC in conditioned   |                            |
|      | > space **OR**                  |                            |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| 3    | > SEER 13 with AFUE 90 **OR**   | > Double pane window       |
|      | >                               | >                          |
|      | > SEER 13 with HSPF 7.9 **OR**  | > with any U-factor        |
|      | >                               |                            |
|      | > Ducts & HVAC in conditioned   |                            |
|      | > space **OR**                  |                            |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| 4 or | > SEER 12 with AFUE 92 **OR**   | > R-0 unconditioned        |
| 5    | >                               | > basement                 |
|      | > SEER 12 with HSPF 8.2 **OR**  | >                          |
|      | >                               | > R-0 slab                 |
|      | > Ducts & HVAC in conditioned   | >                          |
|      | > space **OR**                  | > R-19 floor               |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| 5    | > SEER 12 with AFUE 92 **OR**   | > R-13 wall                |
|      | >                               | >                          |
|      | > SEER 12 with HSPF 8.2 **OR**  | > R-19 floor               |
|      | >                               |                            |
|      | > Ducts & HVAC in conditioned   |                            |
|      | > space **OR**                  |                            |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| 6    | > SEER 12 with AFUE 92 **OR**   | > R-38 ceiling             |
|      | >                               | >                          |
|      | > SEER 12 with HSPF 8.2 **OR**  | > R-13 wall                |
|      | >                               |                            |
|      | > Ducts & HVAC in conditioned   |                            |
|      | > space **OR**                  |                            |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| 7    | > AFUE 92 **OR**                | > R-38 ceiling             |
|      | >                               | >                          |
|      | > HSPF 8.2 **OR**               | > R-15 wall                |
|      | >                               |                            |
|      | > Ducts & HVAC in conditioned   |                            |
|      | > space **OR**                  |                            |
|      | >                               |                            |
|      | > Ground source heat pump       |                            |
+------+---------------------------------+----------------------------+
| No   |                                 |                            |
| tes: |                                 |                            |
|      |                                 |                            |
| 1    |                                 |                            |
| .  T |                                 |                            |
| able |                                 |                            |
|      |                                 |                            |
|  N11 |                                 |                            |
| 02.1 |                                 |                            |
|      |                                 |                            |
| requ |                                 |                            |
| irem |                                 |                            |
| ents |                                 |                            |
|      |                                 |                            |
|  not |                                 |                            |
|      |                                 |                            |
|   st |                                 |                            |
| ated |                                 |                            |
|      |                                 |                            |
|   re |                                 |                            |
| main |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| ame. |                                 |                            |
|      |                                 |                            |
|  All |                                 |                            |
|      |                                 |                            |
|    f |                                 |                            |
| ootn |                                 |                            |
| otes |                                 |                            |
|      |                                 |                            |
|   of |                                 |                            |
|      |                                 |                            |
|    T |                                 |                            |
| able |                                 |                            |
|      |                                 |                            |
|  N11 |                                 |                            |
| 02.1 |                                 |                            |
|      |                                 |                            |
|   ap |                                 |                            |
| ply. |                                 |                            |
|      |                                 |                            |
| 2    |                                 |                            |
| .  A |                                 |                            |
| fter |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| year |                                 |                            |
|      |                                 |                            |
| 2006 |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| SEER |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| hall |                                 |                            |
|      |                                 |                            |
|   be |                                 |                            |
|      |                                 |                            |
|    i |                                 |                            |
| ncre |                                 |                            |
| ased |                                 |                            |
|      |                                 |                            |
|   by |                                 |                            |
|      |                                 |                            |
|    2 |                                 |                            |
|      |                                 |                            |
| from |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|    v |                                 |                            |
| alue |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
|      |                                 |                            |
| this |                                 |                            |
|      |                                 |                            |
|   ta |                                 |                            |
| ble; |                                 |                            |
|      |                                 |                            |
| HSPF |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| hall |                                 |                            |
|      |                                 |                            |
| incr |                                 |                            |
| ease |                                 |                            |
|      |                                 |                            |
| from |                                 |                            |
|      |                                 |                            |
|  7.9 |                                 |                            |
|      |                                 |                            |
|   to |                                 |                            |
|      |                                 |                            |
|  8.5 |                                 |                            |
|      |                                 |                            |
|  and |                                 |                            |
|      |                                 |                            |
| from |                                 |                            |
|      |                                 |                            |
|  8.2 |                                 |                            |
|      |                                 |                            |
|   to |                                 |                            |
|      |                                 |                            |
| 8.8. |                                 |                            |
|      |                                 |                            |
| 3.   |                                 |                            |
|   In |                                 |                            |
|      |                                 |                            |
|    z |                                 |                            |
| ones |                                 |                            |
|      |                                 |                            |
|    3 |                                 |                            |
|      |                                 |                            |
|  thr |                                 |                            |
| ough |                                 |                            |
|      |                                 |                            |
|    8 |                                 |                            |
|      |                                 |                            |
| dwel |                                 |                            |
| ling |                                 |                            |
|      |                                 |                            |
|    u |                                 |                            |
| nits |                                 |                            |
|      |                                 |                            |
| with |                                 |                            |
|      |                                 |                            |
| elec |                                 |                            |
| tric |                                 |                            |
|      |                                 |                            |
|   re |                                 |                            |
| sist |                                 |                            |
| ance |                                 |                            |
|      |                                 |                            |
|  hea |                                 |                            |
| ting |                                 |                            |
|      |                                 |                            |
|  are |                                 |                            |
|      |                                 |                            |
|  not |                                 |                            |
|      |                                 |                            |
| elig |                                 |                            |
| ible |                                 |                            |
|      |                                 |                            |
|   to |                                 |                            |
|      |                                 |                            |
|  use |                                 |                            |
|      |                                 |                            |
| this |                                 |                            |
|      |                                 |                            |
|   ta |                                 |                            |
| ble. |                                 |                            |
|      |                                 |                            |
| 4.   |                                 |                            |
|   "D |                                 |                            |
| ucts |                                 |                            |
|      |                                 |                            |
|    & |                                 |                            |
|      |                                 |                            |
| HVAC |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
|      |                                 |                            |
|  con |                                 |                            |
| diti |                                 |                            |
| oned |                                 |                            |
|      |                                 |                            |
|   sp |                                 |                            |
| ace" |                                 |                            |
|      |                                 |                            |
| incl |                                 |                            |
| udes |                                 |                            |
|      |                                 |                            |
|  air |                                 |                            |
| -han |                                 |                            |
| dler |                                 |                            |
|      |                                 |                            |
|  and |                                 |                            |
|      |                                 |                            |
|  fur |                                 |                            |
| nace |                                 |                            |
|      |                                 |                            |
|    b |                                 |                            |
| eing |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
|      |                                 |                            |
|  con |                                 |                            |
| diti |                                 |                            |
| oned |                                 |                            |
|      |                                 |                            |
|   sp |                                 |                            |
| ace. |                                 |                            |
|      |                                 |                            |
|   Fa |                                 |                            |
| ctor |                                 |                            |
| y-se |                                 |                            |
| aled |                                 |                            |
|      |                                 |                            |
|  air |                                 |                            |
|      |                                 |                            |
| hand |                                 |                            |
| lers |                                 |                            |
|      |                                 |                            |
|  tes |                                 |                            |
| ted, |                                 |                            |
|      |                                 |                            |
|   li |                                 |                            |
| sted |                                 |                            |
|      |                                 |                            |
|  and |                                 |                            |
|      |                                 |                            |
|  lab |                                 |                            |
| eled |                                 |                            |
|      |                                 |                            |
|   by |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| manu |                                 |                            |
| fact |                                 |                            |
| urer |                                 |                            |
|      |                                 |                            |
|   as |                                 |                            |
|      |                                 |                            |
|   ha |                                 |                            |
| ving |                                 |                            |
|      |                                 |                            |
|    a |                                 |                            |
|      |                                 |                            |
|   2% |                                 |                            |
|      |                                 |                            |
|   or |                                 |                            |
|      |                                 |                            |
| less |                                 |                            |
|      |                                 |                            |
|  lea |                                 |                            |
| kage |                                 |                            |
|      |                                 |                            |
| rate |                                 |                            |
|      |                                 |                            |
|   at |                                 |                            |
|      |                                 |                            |
|  1.0 |                                 |                            |
|      |                                 |                            |
| inch |                                 |                            |
|      |                                 |                            |
|    w |                                 |                            |
| ater |                                 |                            |
|      |                                 |                            |
|    g |                                 |                            |
| auge |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| hall |                                 |                            |
|      |                                 |                            |
| meet |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|  req |                                 |                            |
| uire |                                 |                            |
| ment |                                 |                            |
|      |                                 |                            |
|  for |                                 |                            |
|      |                                 |                            |
|  air |                                 |                            |
|      |                                 |                            |
|  han |                                 |                            |
| dler |                                 |                            |
|      |                                 |                            |
|    b |                                 |                            |
| eing |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
|      |                                 |                            |
|  con |                                 |                            |
| diti |                                 |                            |
| oned |                                 |                            |
|      |                                 |                            |
|   sp |                                 |                            |
| ace. |                                 |                            |
|      |                                 |                            |
| 5.   |                                 |                            |
|  For |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|  uni |                                 |                            |
| nsul |                                 |                            |
| ated |                                 |                            |
|      |                                 |                            |
|    u |                                 |                            |
| ncon |                                 |                            |
| diti |                                 |                            |
| oned |                                 |                            |
|      |                                 |                            |
|    b |                                 |                            |
| asem |                                 |                            |
| ents |                                 |                            |
|      |                                 |                            |
|    t |                                 |                            |
| rade |                                 |                            |
|      |                                 |                            |
|  off |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
|      |                                 |                            |
|    Z |                                 |                            |
| ones |                                 |                            |
|      |                                 |                            |
|    4 |                                 |                            |
|      |                                 |                            |
|  and |                                 |                            |
|      |                                 |                            |
|   5, |                                 |                            |
|      |                                 |                            |
|   at |                                 |                            |
|      |                                 |                            |
| most |                                 |                            |
|      |                                 |                            |
|  one |                                 |                            |
|      |                                 |                            |
| foot |                                 |                            |
|      |                                 |                            |
|   of |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| base |                                 |                            |
| ment |                                 |                            |
|      |                                 |                            |
| wall |                                 |                            |
|      |                                 |                            |
|  can |                                 |                            |
|      |                                 |                            |
|   be |                                 |                            |
|      |                                 |                            |
|    a |                                 |                            |
| bove |                                 |                            |
|      |                                 |                            |
|   gr |                                 |                            |
| ade. |                                 |                            |
|      |                                 |                            |
|  Any |                                 |                            |
|      |                                 |                            |
|  com |                                 |                            |
| bina |                                 |                            |
| tion |                                 |                            |
|      |                                 |                            |
|   of |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|   fo |                                 |                            |
| unda |                                 |                            |
| tion |                                 |                            |
|      |                                 |                            |
|   in |                                 |                            |
| sula |                                 |                            |
| tion |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| peci |                                 |                            |
| fied |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| hall |                                 |                            |
|      |                                 |                            |
|   be |                                 |                            |
|      |                                 |                            |
|   pe |                                 |                            |
| rmit |                                 |                            |
| ted. |                                 |                            |
|      |                                 |                            |
| 6    |                                 |                            |
| .  S |                                 |                            |
| labs |                                 |                            |
|      |                                 |                            |
| with |                                 |                            |
|      |                                 |                            |
|  uni |                                 |                            |
| nsul |                                 |                            |
| ated |                                 |                            |
|      |                                 |                            |
|  hot |                                 |                            |
|      |                                 |                            |
|    w |                                 |                            |
| ater |                                 |                            |
|      |                                 |                            |
|   pi |                                 |                            |
| pes, |                                 |                            |
|      |                                 |                            |
|  uni |                                 |                            |
| nsul |                                 |                            |
| ated |                                 |                            |
|      |                                 |                            |
|  air |                                 |                            |
|      |                                 |                            |
| dist |                                 |                            |
| ribu |                                 |                            |
| tion |                                 |                            |
|      |                                 |                            |
|    d |                                 |                            |
| ucts |                                 |                            |
|      |                                 |                            |
|   or |                                 |                            |
|      |                                 |                            |
| elec |                                 |                            |
| tric |                                 |                            |
|      |                                 |                            |
|  hea |                                 |                            |
| ting |                                 |                            |
|      |                                 |                            |
|   ca |                                 |                            |
| bles |                                 |                            |
|      |                                 |                            |
|    i |                                 |                            |
| nsta |                                 |                            |
| lled |                                 |                            |
|      |                                 |                            |
|   wi |                                 |                            |
| thin |                                 |                            |
|      |                                 |                            |
|   or |                                 |                            |
|      |                                 |                            |
|    u |                                 |                            |
| nder |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| slab |                                 |                            |
|      |                                 |                            |
|  are |                                 |                            |
|      |                                 |                            |
|  not |                                 |                            |
|      |                                 |                            |
| elig |                                 |                            |
| ible |                                 |                            |
|      |                                 |                            |
|  for |                                 |                            |
|      |                                 |                            |
| this |                                 |                            |
|      |                                 |                            |
| trad |                                 |                            |
| eoff |                                 |                            |
|      |                                 |                            |
|   of |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| lab- |                                 |                            |
| edge |                                 |                            |
|      |                                 |                            |
|  ins |                                 |                            |
| ulat |                                 |                            |
| ion. |                                 |                            |
|      |                                 |                            |
| 7.   |                                 |                            |
|  Eva |                                 |                            |
| p­o­ra |                                 |                            |
| ­tive |                                 |                            |
|      |                                 |                            |
|  coo |                                 |                            |
| ling |                                 |                            |
|      |                                 |                            |
|    s |                                 |                            |
| hall |                                 |                            |
|      |                                 |                            |
| meet |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
| SEER |                                 |                            |
|      |                                 |                            |
|  req |                                 |                            |
| uire |                                 |                            |
| ment |                                 |                            |
|      |                                 |                            |
|   if |                                 |                            |
|      |                                 |                            |
| code |                                 |                            |
|      |                                 |                            |
| offi |                                 |                            |
| cial |                                 |                            |
|      |                                 |                            |
|  has |                                 |                            |
|      |                                 |                            |
|   de |                                 |                            |
| emed |                                 |                            |
|      |                                 |                            |
|  eva |                                 |                            |
| pora |                                 |                            |
| tive |                                 |                            |
|      |                                 |                            |
|  coo |                                 |                            |
| ling |                                 |                            |
|      |                                 |                            |
|  app |                                 |                            |
| ro­pr |                                 |                            |
| iate |                                 |                            |
|      |                                 |                            |
|   to |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|  cli |                                 |                            |
| mate |                                 |                            |
|      |                                 |                            |
|   of |                                 |                            |
|      |                                 |                            |
|  the |                                 |                            |
|      |                                 |                            |
|    j |                                 |                            |
| uris |                                 |                            |
| dict |                                 |                            |
| ion. |                                 |                            |
|      |                                 |                            |
| 8.   |                                 |                            |
|   Ma |                                 |                            |
| rine |                                 |                            |
|      |                                 |                            |
| zone |                                 |                            |
|      |                                 |                            |
|   re |                                 |                            |
| side |                                 |                            |
| nces |                                 |                            |
|      |                                 |                            |
|  wit |                                 |                            |
| hout |                                 |                            |
|      |                                 |                            |
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| chan |                                 |                            |
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|  air |                                 |                            |
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| cond |                                 |                            |
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| ning |                                 |                            |
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| hall |                                 |                            |
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| SEER |                                 |                            |
|      |                                 |                            |
|  req |                                 |                            |
| uire |                                 |                            |
| ment |                                 |                            |
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|   ta |                                 |                            |
| ble. |                                 |                            |
+------+---------------------------------+----------------------------+

##  

**8) SUPPORTING INFORMATION (State purpose and reason, and provide
substantiation to support proposed change):**

The purpose of this proposal to the International Residential Code
\[IRC\]) and to the International Energy Conservation Code is to further
the usability of the energy codes. The U.S. Department of Energy has for
the past decade worked to promote the energy codes in numerous
ways---assisting states and localities in adopting and implementing
IECC/IRC-based codes, developing and deploying user-friendly code
compliance tools, hosting workshops and training sessions, operating an
energy codes hotline, assembling and distributing information via a
dedicated web site and email list, and proposing helpful changes to the
IECC through the ICC code development process. Directly parallel and
usually identical changes are being proposed for the IECC.

As DOE has promoted the adoption and use of the IRC/IECC, builders and
code officials have repeatedly echoed one consistent comment---that the
residential portion of the IECC/IRC is difficult to understand,
complicated to adopt and implement, and expensive to enforce. This
comment has been widespread in spite of the availability of very
easy-to-use---and free---code compliance software. In evaluating the
causes for these comments, DOE has identified a number of specific
characteristics that make the energy portion of the IRC and residential
IECC difficult to use, especially by jurisdictions with limited staff
and budget. In no particular order, these include:

-   Because IECC thermal criteria (insulation and windows requirements)
    are a function of heating degree-days (HDD), and any particular
    location may have multiple sources of HDD data or be equally distant
    from more than one source, there is sometimes ambiguity as to what
    the code requires. Further, the HDD framework makes it difficult to
    properly accommodate cooling concerns in the code. Finally, the HDD
    basis, which is used only in some of the IECC's compliance paths,
    differs from the county-defined zones used in some other compliance
    paths (including some commercial sections) of the IECC and in the
    IRC.

-   Because envelope stringency is a function of glazing area as a
    percentage of wall area, the code behaves irrationally in some ways.
    For example, the code tends to permit a less efficient envelope for
    larger houses and for houses with inefficient aspect ratios or
    ceiling heights. In apparent contradiction, low-window-area homes
    (e.g., low-budget starter homes) can have wall and window
    requirements that are unreasonably inefficient.

-   The IRC has energy requirements only for residences with glazing
    less than 15%, making it an incomplete energy code.

-   The code's requirements are very non-uniform, especially in the
    IECC, making it difficult or impossible for builders and code
    officials (and homebuyers) to develop a sense of the code's baseline
    requirements in a jurisdiction. For example, the HDD-based
    requirements vary from location to location within a jurisdiction,
    and often result in unexpected differences between adjacent
    jurisdictions that are part of a larger community or metropolitan
    area. Further, because envelope efficiency requirements vary with
    building geometry, the code's requirements cannot be known until a
    design is finalized, which makes change orders after construction
    has begun difficult and expensive, sometimes resulting in
    noncompliance even when the new design would use less energy. Also,
    different building types generally have different requirements.
    Finally, the combination of HDD-based criteria and county-based
    zones results in apparent ambiguities and sometimes jurisdictional
    confusion between residential and commercial sections.

-   The IECC code text is frequently cited as being difficult to read
    and understand due to its length and apparent lack of integration
    between compliance paths.

For all the reasons listed above, DOE finds that enforcement of the code
is inconsistent at best, and very rare for some important building
elements such as glazing area, which has a large influence on the
required R-values and U-factors for a given house.

DOE has therefore developed a proposal that rewrites Chapter 11 of the
IRC and residential sections of the IECC. The intent is to transform the
code to a format that is easy to understand, easy for builders and
inspectors to remember, relatively unchanging within jurisdictional
boundaries, unambiguous, and inexpensive to adopt and enforce. The
format we have chosen is exemplified by a single provision that was
introduced to the IECC in 1998---the SHGC requirement for windows in
southern locations. That code provision, in contrast to the bulk of the
code, has been well understood, readily implemented, and has generated
little if any confusion. DOE's current code change proposal follows that
model in several ways, focusing on clear and unambiguous specifications
even at the expense of some precision. (The SHGC requirement is a
uniform 0.40 over a very large geographical area and never changes
regardless of the building type, size, shape, orientation, or any other
factor.)

This code change reformats the IRC's energy provisions without
substantially affecting the overall stringency of the code. Note,
however, that with any change in format, especially one that changes the
geo-climatic basis for the requirements, some specific locations will
experience modest stringency changes.

Another goal of this proposal is to produce efficiency prescriptions
that are easily memorized by builders and code officials in any
particular jurisdiction, as codes of this nature are observed to
experience considerably higher compliance rates than codes for which
each and every house has different requirements. Despite its historical
length and complexity, the IECC actually has provisions for only a
handful of residential energy efficiency measures---primarily the
building envelope components and HVAC distribution systems. DOE's
primary intent is to provide very simple, clear, and fair requirements
for these measures.

Following the philosophy discussed above, DOE's change proposal has the
following major characteristics:

-   The climate basis of the proposed requirements has been changed from
    simple HDD to geographical zones that are based on multiple climate
    variables (so that both heating and cooling considerations are
    accommodated). Further, within the U.S., the zones are completely
    defined by political boundaries (county lines) so that code users
    will never have to choose from disparate climate data sources to
    determine local requirements. The proposed new climate zones were
    developed in an open process, in consultation with relevant
    standards committees of the American Society of Heating
    Refrigerating, and Air Conditioning Engineers (ASHRAE). The proposed
    zones are designed to be an appropriate foundation for both
    residential and commercial codes, and may be useful in other
    contexts as well. A thorough discussion of the zones' development
    can be found at
    <http://www.energycodes.gov/implement/pdfs/climate_paper_review_draft_rev.pdf>

-   The proposed code changes prescriptive envelope requirements are not
    a function of window area. Eliminating this dependency has a number
    of beneficial effects on the code's usability and enforceability.
    DOE has analyzed the potential drawbacks of this approach and has
    concluded that the benefits outweigh them. This analysis is
    available for review at
    <http://www.energycodes.gov/implement/pdfs/wwr_elimination.pdf>

-   The proposed code change is designed to accommodate local practices
    and preferences, eliminating common local hurdles to code
    compliance. For example, the proposal accommodates some coastal
    regions' need for glazing with high wind ratings and high-termite
    regions' need for easy compliance without slab-edge insulation.

-   The proposed code change is designed to increase consumer awareness
    of a home's energy features, by making baseline requirements more
    uniform within a jurisdiction and by requiring a disclosure of each
    house's R-values, U-factors, and HVAC efficiencies.

-   The proposed code change is designed, to the extent practicable, to
    incorporate aspects of the latest building science regarding energy
    efficiency and its effects on moisture control and durability. For
    example, the proposed code change contains provisions related to
    unvented crawlspaces, modifies vapor retarder requirements, requires
    sealing of air handlers in garages, and limits worst-case glazing
    U-factors in locations where moisture condensation can be a serious
    problem.

-   The proposed IECC code change greatly simplifies and streamlines the
    text, eliminates unused definitions, brings other definitions into
    agreement with those in other ICC codes, and eliminates many
    inadvertent loopholes that have resulted from unintended
    interactions between compliance paths.

In preparing this change proposal, DOE has worked for two years with
numerous interested parties, including builders, code officials,
manufacturers, efficiency advocates, energy simulation experts, and
building scientists. DOE has worked openly, making successive drafts of
the change proposal available for review via DOE's energy codes web site
(<http://www.energycodes.gov/>). Over one hundred individuals and
entities provided hundreds of helpful comments. DOE reviewed all
comments carefully and tried to craft a proposal that fairly balances
all viewpoints without compromising the overall goal of increased
usability. Parts of the proposal were developed in consultation with
experts from ASHRAE's 90.1 standard committee.

DOE believes this proposed change, if adopted, will result in a much
easier to use code, easier and hence more widespread adoption of IRC /
IECC-based state codes, easier and less expensive enforcement, and more
consistent compliance even in jurisdictions with minimal enforcement
infrastructure. We urge the ICC to consider this proposal on those
merits.

**PLEASE USE SEPARATE FORM FOR EACH PROPOSAL**

**SUBMITTAL AS A DOCUMENT ATTACHMED TO AN E-MAIL IS PREFERRED**

(SEE REVERSE FOR DIRECTIONS ON WHERE TO SEND PROPOSALS)