Document GRyJYNJ8RkKMV7bnBD4Me9ZN
American Society of Heating and Ventilating Engineers Guide, 1928
Table 6-J. 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.
CoiJchete Block,
The value? of U.ui this Table are based on the
/bllowmq Internal Conductivity? CO which arc
expressed in 6.t.u. per Ur.; per 5q.ft. per FF
. Concrete blocks
4.84* per l"
Cement Mortar
8.00 per i*
Plaster board.
5.04 per F
Plaster (Gypsum) -
2.32 per l-
Wood Lath 4 Plaster
2.00 as applied
Cort.board
0.30 per l*
Fiber Insulation tboard/oren) 0.33 perl*
Cellular Gypsum (Ae.*)
5S per 1*
Powdered GyfJWi (26*) ' 0.52 per f
v/alls '
0
vi C
UrMcj
v;
Y -Thickness of Insulation vvher Specified
.o
Interior Construction
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100 Plain Vails - Uo Interior Firmh
Thickness, of Concrete blocks -.T
YG a
8' 10' \t'
bCd
0.444) 0.377 0;327 0.287
101 \ Plaster on Concrete blocks
0.408 0.348 0.305 0.271
102 ^Plaster on Metal Lath - furred
0.247 0.224 0.205 0.1.89
103 X Plaster on Wood Lath - furred
O.Z36 0.215 0.198 0.183
104 d plaster on Plaster board - Furred T Plaster on Wood' Lath on 2' furrinq
105 `strips - Cellular Gypsum Fill X Pi aster on Wood Lath on 2* furrinq ^
too strips - Powdered Gypsum fill 107 T Plaster on Fiber Insulation --
(board form) Furred
108
109 jr Plaster on Cork board set in vZ Cement Mortar
110
0.Z46 0.2Z3 0.204 0.188
* 0.182
0.169 0.158 0.149
'*
1%' 0.171
0.t59 0.150 0.141
&' 0.183 0.170 0.159 0.149 r 0.143 0.135 0.128 0.122 \i 0.133 0.126 0.120 0.114
i' .0.109 0.104 0.100 0.096
Based on 1% in., the'actual thickness of 2 in. furring strips.
/
fThe figures on this page may be used with sufficient accuracy for concrete block walls with stucco' .-
exterior finish.
-i- ^^Resistance of hollow concrete blocks = ( = ---- assumed directly proportional to^thickness as
\ c 4.84/
with solid homogeneous materials.
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Table 7-A. Coefficients of Transmission {U) of Various Types of Frame Wall Construction
Nnte__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.
Wood SioitJq 02. Clapboard walls f
The values of U in this Table are based on the
/bllowmq Internal Conductivities (C) which are
expressed m b.t.u. per Ur. per Sq.ft-, per
Wood (Yellow Pine or fir) '
1.00, per l"
Plaster (Gypsum)
Wood Lath ( Plaster Plaster , board
2.32 2.00 3 04
per 1* as applied -per 1*
Cork board
0.30
Fiber Insulation (board/brm) 0.33
per 1* per-f
ffelt or Quilt Insulation (S</t) 0.2 7 per l
Ce-lluJar Gypsum (i&*)
0.54 per f
Powdered Gyp5um (26*) .
0.52
per l
Typical Const ruction
ohealhtnq
W ood uds^
___ /
((N-*.r
V
_o
l3 -21.
Type of Sheathmq
Ill Wood
III Wood *
113 Wood
114 Wood *
115 Wood *
* lib Wood
in Wood*
118
W fiber Insulation
(board form)
i* Fiber Insulation
in (board form)
yfr Fiber Insulation 120 (board form)
121 Plaster Board
Insulation. between
Studdinq
Plaster base
Done
Wood Lath
fe* felt or Quilt *
Insulation
1/1* Fiber Insulation *
(board form)
.
Cellular Gypsum fill
* Powdered Gypsum fill
Wood Lath Wood Lath Wood Lath Wood Lath
Coe/^icient
0/
Transmission
U 0.227
- 0.129
0.135
0.110
* 0.101
Done
. i)z Cork board
0:il0.
Done
Z" Cork board
Done
Done
VC fiber Insulation t
(board form)
It fiber Insulation
(board form)
% fiber Insulation
(board form)
Yi fiber Insulation (Board form')
Done
3/fe Plaster board
0.093 6.157 0.127 ' 0.107 0.280
Based on H in., the actual thickness of 1 in. or % in. sheathing. tBuilding paper neglected in computations in accordance with accepted practice. ?Can also be applied on inside of studding with plaster base separated by furring strips. Thickness of fill assumed in., based on 2 in. by 4 in. studding.
Y-
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