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American Society of Heating and Ventilating Engineers Guide, 1931
Table 24. Coefficients of Transmission (U) of Brick Veneer Frame Walls
Note.--These coefficients are expressed in B.t.u.per hour per square foot per 1 deg. fahr.
DIFFERENCE IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARE BASED ON AN OUTSIDE WIND
EXPOSURE OF IS MILES PER HOUR.
TVie values of U in this Table are basedon tbefollowinq
Internal Conductivities or Conductances which are.
expressed in b.t.u.per Ur. per Sq.Ft. per 1* F
Wood (Yellow Roeor Fir) Plaster (Gypsum)
1.00 perl" 2.32 per I"
Plaster board 3.73 per J Cork board Wood Lath 4 Plaster
2.80 per ( 0.30 per I"
2.00 asapptied
RiqiA Insulation (Boardforot) 0.33 perl"
. Flexible Insulation
0.27 perl"
Cellular Gypsum (18*) Flaked Gypsum (24*)
0.53 per 1" 0.4 & per I"
Brick.
5.00: pen 1"
Typical Construction
.SheatVimq
4"Brickv
Plaster Ba.se
_J0D13
Type of SVieotViinq
Insulation between Studdino)
Wood Lath
Metal Lath
2T i kiaid I'Eiqid Plaster Insula- Insuiaboard -tiof? -tion
CIko."rk board
2" Cork board
A B C D E F. G
1
Hone
0.247 0.258 0.248 0.189 0.147 QI14 Q087
2 rWoodb 3
Plaited Gypsum fill (24*) a
0.094
0.095
0.094
0.084
0.075
0.065 0.058
Cellular Gypsum 0.108 o. no 0.108 0.095 0.083 0.072 0.064
4.
if Flexible Insulation
0.147 0.150 0.147 0.125 0.105 0.087 0.076
5 4 Riqid
None
0.209 0.217 0.210 0.144 0.133 0.106 0.090
<0
Insulation ( board form)
Flaked Gypsum Fill (24*> a
0.087 0.089 0.087 0.079 0.071
0.062 0.056
7
Cellular Gypsum Fill (18*) a-c
0.100
0.102
0.101
0.089 0.079 0.068 0.061
8
Flexible Insulation
0.(33 0.134 0.133 0.114 0.098 0.082 0.072
a
None
0.276 0.290 0.277 0.204 0.157 0.120 0.100
10
t Plaster board
u
12
Flaked Gypsum Fill (24*) a 0.098
0.100
0.098 0.087
O.Q77
0.067
0.060
Cellular Gypsum FiU(l8^tt-c
0.113
0.115
0.113
0.100 0.086 0.074 .0.066
Flexible Insulation
0.157 0.161 0.157 0.131 0.109 0.010 0.079
eThickness of fill assumed 3H in-, based on 2 in. by 4 in. studding. . bBased on % in., the .actual thickness of. 1 in. or Ji in. sheathing. Building paper neglected. cThe coefficient used for cellular gypsum,:0.59 is for 18 lb. weight--freights as low as 12 lb. may be used.
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Chapter 3--Heat Losses by Transmission-
Table 25. Coefficients of Transmission (U) of Interior Walls and Partitions
,, ,,__these coefficients are expressed in B.t.u. per hour per square foot per I deg. fahr. nnmRENCE in temperature between the. air on the two sides and are based on still-air (no wind) Seditions on both sides.
" plastered Frame Partitions
Tbhaesevdaoluntebseofof lUloiwnmthci)s
Table are Internal
ductivities or Conductances
On one side of Studdinq only
which are expressed in 6.t.u. per
Hr perSq.Ft.perl F
Studdinq^
Plaster (Gypsum) J3J per l
Plasterboard
3.73 per j
WoodLath 4 Plaster 2.00 as appid
insulation (BoardTorm)
: ; :pio*t*r-
Flexible Insulation 0.27 perl'
Cork board
, 0.30 perr
Cellular Gypsum (18 )0.99 perl
Flaked Gypsum , Dry (24*) 0.48 perl
Plaster V,
On both sides of Studdinq
Studd mq v.
piode''. TosbA.
1
m V* if :
Insulation between Studdmq
Ins ulatton-7
.Gypsum Fill . .between Studdinq
Gypsum Fill y
(>laster\', S*HJ,
1 TplaM`r}
(Jr PlaxtfV .
r fciqid z nsulation Hexible 'Board Insulation rorm)
Cellular Gypsum Fill *_d
Flaked Gypsum
Fill*
Wo. Plaster Base
A
i Meta'i
; icessiw
2 Wood Lath C
3 ^ Plaster boardf
't l :0-504T-.
4 ^Riqtd Insulation (Boardforrn)L
o:3io
5 fRiqid Insulation (Board fcftrjfi' ; 0.211
6 IV Cork,board
0.149
7 2* Cork boardL
0.119
B 0328. ; 0:294 0.297 0.170 0.113 0.078 0.062
c' D
E
F
0.183 0.173 0.121 0.103
0.172 0.162 0.116 0.100
0.172 0.163 0.117 0.100
0.121 O.llfc 0.090 0.080
0.0&8 0.086 0.071 0.064
0.066 0.064 0.055 0.052
0.054 0.053 0.047 0.044
Plastered masonry partitions
The values <& U mihisTable are based on "the
following internal Conducttv tttes or
Conductance which are expr
per Ur. per Sq.ft-per lF
Uollow Clay Tile (4*)
0.^3 per 4" `
Brick.
5-00 per 1"
Mol low GypsumTile.
OAb per 4"
.Plam Walls (No Piaster')
01
Walls Plastered Wills Plastered
one side
both sides
z. Gy( sum _ F las rer
%1
X Gyp sum Plast r
(
Wo. Wall Construction
i 4" Hollow Clay Tile
2 4" Brick.
3 4' Hollow GypsumTile
A 0.390
0.437 > 0213
B 0.360 0.400 0.258
c
0.333 0.367 0.244 .
. aThe thickness of the gypsum fill is approximately 33$ in., the approximate 4 in. dimension of 2 in. by 4 in. studding.
CMeta1 lath and plaster assumed /i. in, thick.
,.
^Piaster assumed K in', thick.
dTir coefficient.used for cellular gypsum, 0.59 isfor 18 lb. weight--weights as low as 12 lb may he used.
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