Document ZMvaNEm4jkdDg1MXpBaL4g30
American Society of Heating and Ventilating Engineers Guide, 1929
Table 7-G. 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.
4* Cut Stoue VeiJeeb. oiJ Uollow Tile Walls
The value* qF <J m this Table are based on the
/oliowmq internal Conductivities (C) which are
expressed in b.t.u. per Ur. per Sq. Ft. per 1 F
Uollow Tile 4*-0.fc5 .0.50 8-0.43 12'-C1.25
Stone
10.00 per P
Cement Mortar
.6.00 per r
Plaster Board Plaster (Gypsum)
3.04 2.32
per V
per r
Wood Lath f Plaster Cork board Fiber Insulation (Board/brm)
.Cellular. Flaked Gypsum, Oy (26)
2.00 0.30 0.33 0.5<l 0.52
as applied
per r per r per r per r
Y Thickness cf Insulation where specified
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Interior' Construction
Y
\d
L>-
J/l Cemtn Thicfcness(9^ Uollow Tilt -X
6' 8' 12* lb'
a bc d
67 Ram Walls - Llo Interior Finish
0.289 0.265 0.189
0.146
68 i Plaster on Uollow Tile 69 4 Plaster on Metal Lath -Furred
0.272 '0.190
0.Z50
\ 0.17T
0.184 0,140
0.141 0.115.
70 z Plaster on Wood Lath - furred
0.185 0.173
0.137
0.113
71 X Plaster on Vo Plaster Board -Furred
k Plaster on Wood Lath on 2' Furrmq 7Z Strips -' Cellular Gypsum Fill
X Plaster an_WootfL_Lflth on 2* Furrmq 75 Strips - Hated Gypsum Fill*
0.189
0178
* 156 0.149 0.142
* 1%' 0.141
0.135
0.140 0417 0.112
0.115 0.099 ao<?5 ,
74 k Plaster on Fiber Insulation -- 75 (Board form) Furred
76 X Plaster on CorLboard. Cement Mortar
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Set ir? yt
V 0.150 r. 0.122
ivt" 0.114 r 0.096
0.143 O.U7 0.110 0.093
0.117
0.099
0.099 0.086
0.094 "6.082
0.081
0.072
Based on 1M 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.
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r
Chapter I--Heat Losses from Buildings
Table 7-H. Coefficients of Transmission (U) of Various Types of Masonry Wall Construction
Vo**__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.
4" CUT STOhJE VEUEE2. OKi COUCHETE WALLS
The value* of U in this Table are based on the
/blfowinq Internal Conductivities (C) which qre
expressed in B.t.u. per Ur. per Sq.Ft. per l* F
Stone
v W-a> Pr l'
Concrete (Stone M 1:4 mix) MO pert
Cement Mortar
0-00
Plaster Board
3.04
' plaster (.Gypsum)
2.31
Wood Lath < Plaster
2.00
Cork board
0.50
Fiber Insulation (6oard/orm) 0.33
Cellular Gypsum (18*)
0.5<*
Hated Gypsum, Ory (2a)
0.51
per 1* per l Pr l' as applied per per l per V per l
Y-Thickness cf Insulation where specified
L. SV>
Interior
IS Construction
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78 Plain Walls - Do Interior Finish
7T X Plaster on Concrete
Thickness of Concrete -X,
Y <o~ ' 8* 10' 12* 16'
a bc d e
0.459 0.4lb 0.377 0.345 0.296
0.418 0.380 0.348 0.321 0.279
80 J Piaster on Metal Lath - Furred
CX251 0.236 0.224 0.212 0.193
81 j Plaster on Wood Loth - Furred
0.240 0.227 0.215 0.204 0.186
82. k Plaster on & Plaster Board. - Furred
k Plaster on Wood Lath, on Z" Furrinq 83 Strips -Cellulur Gypsum Fill
k Plaster on Wood Lath on 2" Furrmq 84 5trips - Flatted Gypsum Fill 85 ^ Plaster on Fiber Insulation -
(Board form) Furred 86 87 k Plaster on Cork, board `Set in 88 Cement Mortar
0.249 0.235 0.223 0.211 0.192
*
-156 0.184
0.176
0.169
0.163 0.151
% 156 0.172 0.166 0.159 0.153 0,143
Vi 0.185 0.177 0.170 0.163 0.151 (' 0.145 0.140 0.135 0.131 0.123 \'H 0.134 0.130 0.126 6.122 0.116 V 0.110 0.107 0.104 0.102 0.097
Based on 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 a9 low as 12 lb. may be used.
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