Document 10y2EML7LzLDX6z6je8VmYzmj
Number
3" TOM
s3
American Society of Heating and Ventilating Engineers Guide, 1931
Table 20. Coefficients of Transmission (U) of Brick Veneer on Cinder and Concrete Block Walls c
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 ARB BASED ON AN OUTSIDE WIND EXPOSURE OF 15 MILES PER HOUR.
Thevaluesof U in this Table are based on the followtnq Internal Conductivities or Conductances which are expressed in B.t.u. per I4n per Sq.Ft.per lF
Cinder Blocks Sl-O-AS 1Z"=0.28 Concrete Blocks 8"-0.84 . UT = 0.52
Bnck Cement Mortar Plasterboard
5.00 perl* 8.00 perl*^ 3.75 perj
Plaster (Gypsum) Wood Lath 4 Plaster Corkboard
CiiqidInsulation(Boardform) Cellular Gypsum(l8*) Flaked Gypsum,Dry (24*)
2.32 per T 2.00 as applied 0.30 perl"
0.33 perl" 0.5S perl* 0.48 perl*
Y=Thickness of Insulation where specified.
ipH
f
Cement Mortar
Interior Construction
Thickness--X and Idindctf Blocks
Y 8uCtnder ^Concrete l2."Cinder 1 iConcrete a B cD
1 Plain Walls - No Interior Finish
0-245 0.328 0.184 0.264
2 ~ Plaster on Blocks
0.233 0.306 0.177 0.250
3 Plasteron Metal Lath-Furred
0.188 0.234 0.150 0.188
4 ^ Plaster on Wood Lath -furred
0.182 0.224 0.146 0.182,
5 ~ Plasteron ^Plaster board-Furred
0.183
a
6
5 RasteronWoodLathon 2* fumnqStnps --Cellular Gypsum Fill b
if"
0.136
jr Rosteron Wood Lath on i Fumnq Strips
7 -- Flaked Gypsum Fill
^
a
0.125
0.225 0.158 0.144
0.147 0.115 0.107
0.183 0.142 0.130
S 4; Plaster on Riqid Insulation --
(Boardform) furred
8
1"
Z 0.148
r 0.121
0.176 0.138
0.124 0.104
0.156 0,126
IO ^ Plasteron Cork board set in Jr
Cement Mortar
II
li" 0.107 z 0080
0.120 0.083 0.110
0.100 0.081 0.083
Based on 1% 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 lb. may be used. eThe 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.
56
Chapter 3--Heat Losses by Transmission
Table 21. Coefficients of Transmission (U) of Wood Siding or Clapboard Frame Walls
w . __These coefficients are expressed in B.t.u. per hour per square foot per' 1 deg. fahr. INFERENCE in temperature between the air on the two sides and are based on an outside wind EXPOSURE OF 15 MILES PER HOUR.
The voluesof U in this Table are based on the followinq
Internal Conductivities orConductances which are
expressed in B.t.u. per Hr per Sq. ft. per l* F
WKood.,..(.Y..e...llow -Pineor "nr')
Plaster (Gypsum)
,,
Plaster board
3."13 per |
Cork board Wood Lath ^ Plaster Ciaid Insulation(Boardtorm)
1.00 per I*
2.32 perl* 2.80 per j` 0.30 per r 2.00 aeapplied 0.33 per I*
0.27 per l*
0.5H perl*
0.48 pe" 1*
- _Lao> or . 1 Sheathmq
z 1
2 t* Wood b
3
4
5
<b
\ Riqid Insulation
(Board form)
7
8
8
10
i Plaster board
II
12
Insulation between
Studdmq
Wood Lath
A
Metal Lath
B
Plaster base S" 1"
Raster- C.iq\d board Insulation
cDE
Corkboard
F
2" Corkboard
G
None
0.262 0.275 0.263 0.188 0.153 0.117 0.088
Flaked Gypsum Fill (Z4*) a
0.0%
0.088
0086
0.086
0.076
Q067
0.060
Cellular Gypsum Fill (18*) a'c
am
0.113 am
Q087 0.085 0.073 0.065
1 Flexible Insulation
0.152 0.157 0.153 0.128 0.107 0.088 0.077
Hone
0.220 0.228 0.221 0173 0.137 0.108 0.082
Flaked Gypsum Fill (24*)
0.080 0.081 0.080 0.081 0.072 0.063 0.058
Cellular Gypsum
Fill (16*3 a'c O.IOZ 0.104 0.103 0.080 0.080 0.068 0.062
^Flexible Insulation
0.137 0.140 0.137 0.117 0.088 0.083 0.073
None
0.285 0.312 0.287 0.216 0.163 0.123 0.102
Flaked Gypsum Fill (24 ") a
0.088
0.102
0.100
0.088 0.078
0.068 0.062
Cellular Gypsum Fill (18*) a~c
0.116
0.118
0.116 O.IOZ 0.088 0.075 0.067
4" Flexible Insulation
0.163 0.167 0.163- 0.135 0.112 0.08Z 0.080
Thickness of fill assumed 3% in., based on 2 in. by 4 in. studding. bBased on B/6 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.
57