Document 6MDX8M8ZNp46L8j7Dk9Nbp4d
American Society of Heating aiid Ventilating Engineers Guide, 1932
Table 20. Coefficients of Transmission (U) of Brick Veneer on Cinder and Concrete Block Walls':
Note.--These coefficients are expressed in Btu 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.
The values df L) in this Table are basedonthefollowinq
InternalConductiv ittes or Conductances which are expressed in B.t.u. per Wr perSq.Ft.perl*F
Cinder Blocks.
&.-0.45 12**0.26
Concrete Blocks 8"-0.84 IT* = 0.52
Brick
5-00 perl*
Cement Mortar
8.00 perl`s
Plasterboard
3.73 per^
plaster (Gypsum)
2.32 perl*
Wood Lath 4 Plaster
2.00 as applied
Corkboard Rtqtd Insulation (Boardform)
0.30 perl" 0.33 perl*
CellularGypsum(l8*) Flaked Gypsum,Dry (24")
0-59 perl" 0.48 perl"
Y-Thickness of Insulation where specified
!U=H
fH
r
~ Cement Mortar
Number
Interior Construction
Thickness--X and Idmdof Blocks
Y 8- Cinder i^Cancrete 12 Cinder 12"Conerete
AB
cD
1 Plain Wall* - Mo Interior Finish
0.245 0.328 0. (84 0.264
2 ^ Plaster on Blocks
0.233 0.306 0.177 0.250
3 ^ Plasteron Metal Lath-Furred 4 ^ PI aster on Wood Lath - furred
0.188 0.234 0.(50 0.(88 0.182 0.224 0.146 0. (82
5 j Plasteron ^ Plaster board- Furred
0.183
a
^ RasteronWoodLathon 2* fkirrwqStnps
G --Cellular Gypsum Fill b
il" 0.136
0.225 0.158
0.(47 0.115
0.183 0. (42
Plasteron Wood Lath on Z Furrinq Strips 7 -- Flaked Gypsum Fill
a
0.125
0.144 0.(07 0.130
8 ^Plaster or? Siqid Insulation --
(Board form) furred 8
IO 2 Plasteron Oort board set in Cement Mortar
tl
l"
2 0.148 i" 0.121 \k' 0,107
0.(76 0.138 0.(20
0.124 0.(56 0.(04 0.126 0.083 0.1(0
2 0080 0.(00 0.081 0.083;
aBased on1% in., the actual^ thickness-of 2 in. furring strips.
bThe coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12.1b. may be' used.
cThe form of the 8 in. blocks on which the figures in this table are based is shown in the above.sketch.
The 12 in. blocks are-based on two air cells through .the block instead of one, .
....
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Chapter 3--Heat Transfer Through Materials and Constructions.
Table 21. Coefficients of Transmission (U) of Wood Siding or Clapboard Frame Walls
Note.--These coefficients are expressed in Btu per hour per square foot per 1 deg fahr
DIFFERENCE IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARB BASED ON AN OUTSIDE WIND
EXPOSURE OF 15 MILES PER HOUR.
The values of U in this Table are based on the followinq
Internal ConductivitiesorConductances whicbare
expressed m Bt.u. per Wr per Sq. Ft. per l* F
Wood (Yellow Pine or Fir)
LOO per 1"
Plaster (Gypsum)
_ 2.32 per T
Raster board
3.73 per
2.80 per y
Corkboard Wood Lath ^ Plaster Ctqid Insulation(Boardform)
0-30 perl* 2.00 asapplied 0.33 per 1"
Flexible Insulation Cellular Gypsum (18*)
0.27 per 1* 0.59 per 1"
Flaked Gypsum (24*)
0.48 per 1*
Typical Const ruction 2*x4,` Studs *v
W3od Sidin<q-
If1* U
Sheathin r
lrS-
o .o ! . Sheathinq
z
Insulation between Studdinq
Wood Lath
A
Metal Lath
B
Plaster base
s; 1X" r
(V
Plaster kiqid Riqid Cork board Insulation Insulation board
C DEr
2" Corkboard
G
1
None
0.262 0.275 0.263 0.18& 0.(53 0.117 0.088
2 l* Wood b
3
4 5
Flaked Gypsum Fill (24*) a
0.086
0.088 0.086 0.086
0.076
0.067
0.060
Cellular Gypsum Fill (18*) *-c
0.111
0.113 Q til
Q087 0.085 0.073 0.065
Flexible Insulation
0.152 0.157 0.153 0.128 0.(07 0.088 0.077
None
Q220 0.228 0.221 0.173 0.(37 0108 6.082
(o
T B-iqid Insulation
( Board form)
7
8
8
4 Plaster 10 board
II
12
Flaked Gypsum Fill (24*)
0.080 0.081 0.080 0081 0.011 0063 0058
Cellular Gypsum
Fill (l&*) a'c O.IOZ 0104 0.103 0.080 0.080 0068 o.oU-
4 Ft exible Insulation
0.137 0.140 0.137 0.117 0.088 0.083 0,073
None
0.285 0.312 0287 0.216 0.(63 0.123 aioz
flaked Gypsum fill (24*) a
0.088
6.102
0.100
0.088 0.078
0.068 0.062
Gellular Gypsum Fill (18*) a"c
0.116
0.118
0.116 O.IOZ 0.088 0075 0,067
f Flexible Insulation
0.163 0.167 0.163 0.135 0.IIZ 0.082 0.080
^Thickness of fill assumed 3^g in., based on 2 in. by 4 m.-studding. bfiased on in., the.actual thickness of 1 in. or in. sheathing. Building paper.neglected!.
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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