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Conparative estii:nated fuel savings in heating dwelling

houses souippeci with various iiieans

for re due inr, heat loss

ihis is a brief di.gest of a section of Bureau of Standards Gircular

No. 376 (October 17, 19f9), ’’Thermal Insulation of Buildings”,^ covering

estiriated fuel savings in the heating of dv.^clling houses made possible

through application of ?7eathers tripping, storm sash and insulation

»

The estEiaied savings are based on air infiltration data from The American Society of Heating ai.d Ventilating lirigineer’s Guide, and heat

conductivity values deterrained from tests conducted by the National

uureau of Standards on a large n'uaber of co..mercial insulating raaterials

at ordinal^" temperat'ores

.

jiltiio-if-'h the estiroated fuel savings are only approximate on account

of wide variations in sines of cracKs and clearances

sash and doors, suen data are useful to indicate the

ing heat loss preventives to the house structure.

around v/indow

advantages of

fraiaes

,

apply-

\lvailabie from Superintendent of Documents, Government Drinting

Office, Washington, D. G. (Price 5 cents)

1

TAbLE I

AT.’prcxir:*ate percentages of fnel savings resulting from

the application of rieat loss pieventives

to a ho u se no t so i^rotectei.

Construction (conditions assumed)* Approximate

Savings

V/alls aid hoof Windows and Poors Per Cent**

No insulation E’eat her st r ipping only 15 to 20

ho insulation Storm sash anu weather stripj.ing 25 to SO

insulation No storm sash or v;eatl.er str ipping 20 to SO

insulation Weatherstr ipping only About 4 0

insulation Storm sash only About 50

1*' insulation No storm sash or weatherstripping SO to 40

1" insulation Weather stripiTing oiiiy About 50

1" insulation Storm sash only About 60

TABLE

Approximate percentages of fuel savings resulting from

the additi 02i of heat loss preventives

to a v/eatherst ?'ippcd. housec

Construction (conditions assumed

• ' Savings

E’alls and hoof ; Windows and Poors Per Cent**

No insulation Storm sash 10 to 15

insulation ITo storm sash 25 to 35

insulation • Storm sash 4 0 to 4 5

1" insulation ; No storm sash 35 to 4 5

1” iiisulation Stern sash 50 to 55

AT>-nroximate

*V7indovrs and doors ; Aggregate area of such openings assumed to be

1/5 of total side-'wall surface.

V7ind veloclt:- ; Heat loss through ivindcws and doors assumed equal

to loss of heat resulting from a b-milo vind striding the wall perpendicularly; this being a rough average of infiltration c ondit i ons_pr evail ing

throughout the country.

Insulating material ; A typical commercial insulating material was assumed applied to walls and roof or attic,

**The percentages of fuel savings shown in Table II are approxim.at ely

Ibfj to 20% less than those in Table I > since they are based on the amount

of fuel consumed in heating a house equipped with weather stripping,

whereas those shown in Table I are based on a house not equipped with

weatherstr ipping.

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