Document vVOaXXRyY0vG8BjXeMnw0BkNR
American Society of Heating and Ventilating Engineers Guide, 1929
Table 7-A. Coefficients of Transmission (U) of Various Types of Masonry Wall Construction
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 15 miles per hour.
Solid Bgick. Walls t
` The values of U in this Table are based on the
/bllowinq Internal Conductivities (C) which are
expressed in &t.U. per Ur. per Sq.Ft. per lF
Brick.
5.00 per l*
Cement Mortar
8.00 per 1*
Plasterboard
3.04 per l*
Plaster (Gypsum)
2.32 perf
Wood Lath Plaster
2.00 as applied
Cork board
0.30 per 1*
Fiber Insulation (Board ^orm) 0.33 per l"
Cellular Gypsum fl8*)
0.54 per l*
Flaked GyP*umi Dry (ft?) 0.52 perl'
Hollow itie 2*- 1.14 4" 0.65
. `
Y -Thickness Insulation where Spect/ied
sV>
dI 32
1 nterior Construction
Y
Thickness of brick - X
4' 13' 18" 24"
a to c d
1 Plain Walls - Wo Interior Finish
0.358 . 0. 278 0.Z18
0.173
z ^Plaster on Brick.
0.332
0. 263 0.208 0.166
3 4 Plaster on Metal lath - Furred 4 -l Plaster on Wood lath - Furred
0.216
0.185
0.156 0.13T
0.209 0.174
0.15Z
0.128
5 Plaster on % Plaster board -- Purred T Plaster on Wood Lath on 2" Furnnq
6 Strips - Cellular Gypsum Fill \ Plaster on. Wood Lath on 2" Furnnq
7 Strips - Flo.k.ci Gypsum Fill%
0.215
* i% 0.165
* 0.156
0.184
0.155
0.131
0.146
0.128 '0.111
0139 0.122 0.106
8 Jf Plaster On Fibre Insulation -- ( board form) Furred
8
10 \ Plaster on Cork board Set m l/L Cement Mortar
ti
X Plaster on l" UollowTile (t Cement ll-A Mortar between Tile and forick.)
VL 0.166 r 0.153 \'A 0.124 2" 0.(03
0.252
0.147 0.128
0.120 0. 113
0.107 0.102
0.045 0.087
0.210 0.174
O.lll 0.085 o.oqo 0.074
0.144
i Plaster on 4' UollowTile (-i Cement lib Mortar between Tile and fonck.}
0.217 0.185 0.156 0.131
Based on 1H in., the actual thickness of 2 in. furring strips. tThe coefficients on this page can also be used with sufficient accuracy for the Ideal Rolok-Bak Wall. Note.--The coefficient used for plasterboard is 3.04 per inch thickness--recent data indicate values
as low as 1.30 for this material. Note.--The coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb.
may be used.
Chapter I--Heat Losses from Buildings
Table 7-B. Coefficients of Transmission (U) of Various Types of Masonry Wall Construction
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 15 miles per hour.
BaiCK. Veueeg. oh Hollow Tile Walls
The values cf AJ w this Tabic are based, on the
/oHowinq Internal Conductivities (C) which are
e&pre9ed wr &t.u. per Ur. per Sq. Ft. per lF
Hollow Tile 4'-a65 6*-O50 tf-a.43 tl'-0.26
brick
5.00 per f
Cement Uortar
BOO per f
Plaster board
3.04 per 1*
Plaster (Gypsum)
1.11 per f
Wood lath $ Plaster
2.00 as applied
Cork board.
0.30 per 1*
Fiber Insulation (Board/brm)
0.33 per l*
Cellular Gypsum (IS*)
Flaked Gypsum, Dry (p?)
0.54 per f o.SZ per l"
Y- Thickness qf Insulation where spe'ct/ied
_ AiU.
Interior Construction
41
12 Plain Walls - Uo Interior Finish
Vt Cement Mortar
Thickness of UollowTile - X
Y 4' a
6" 8" 6c
11" d
0.2*14 0.260 0.Z40 0.175
13 \ Plaster on Uollow Tile
am 0.246 0228 0.169
14 J Plaster on Metal Lath - Furred
o.m 0.176 0167 QI33
15 i Plaster on Wood Lath - Furred
.0.186 0.171 0162 0.130
16 j Plaster on Plaster board --Furred
17
Raster on Wood Lath on ^Furrinq strips -- Cellular Gyp^ant Fill
0191
* 0.151
is
Plaster on' Wood Lath on 2* Furrinq Strips -- f^Vedl Gypsum Fill
irf
0.142
18 i Plaster on Fiber Insulation -- 20 (board form.) Furred
21 i Plaster on Cortboard Set in */i 22 Cement Uortar
w" 0.151 r 0.123 ivi 0.115 2' 0.097
0.176
0.141
0.134 ai4i 0117 0.109 0.092
0.166 0133
0.135 0.112
0.128 0.107
0.135 0112 0.105 0090
6.112 0.096 0.091 00791
Based on 1% in., the actual thickness of 2 in. furring strips. Note.--The coefficient used for plasterboard is 3.04 per inch thickness--recent data indicate values as low as 1.30 for this material. Note.--The coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used.
23 x