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American Society of Heating and Ventilating Engineers Guide, 1936 1
Table 5. Coefficients of Transmission (U) of Various Types of Frame Construction
INTERIOR FINISH
These coefficients are expressed tn Btu per hour per square foot per degree Fahrenheit difference tn temperature between the air on the two stdes, and are based on a wind velocity of 15 mph
TYPICAL CONSTRUCTION
exterior finish
TYPE OF SHEATHING
1 in. Wood4*
Wood Siding or Clapboard X in* Rigid Insulation
H .in. Plaster Board
No Insolation Between Stoddino
Insulation Between Studding
P laster (X in .) n m e ta l la th -- stud
space fa ce d one Bide w ith b rig h t a lu m in u m fo il
N?:
1
1
3
0 0
S
1 s 0 o
S 3
0.25
00 ja
&
.3 1 0 0
t
B
0.26
. oa 3
j a
a
l
si wo Si
Phw .
c
0.25
0 .2 3 3 S
a c i
.sj
XS 1o
|5
S>
0 .2
-30 s.
*T3 a c
u
2| si
J= . .& .
DE
0.19
0.15
d -a
s od
~a
1 -35
0 O d f
ll
|S
Ph . .
F
<8*3 -ft,
- 11
cva
MM- .
G
H
0.11
0.19
0.19
0.23
0.24
0.23
0.1S
0.14
0.11
0.18
0.18
0.31 * 0.33
0.31
0.22
0.17
0.13
0.23
0.23
J3
3-
S
4s!
sfi 6.I
-III
m
i
Ji & l|i
aF
a.5. aa
a
,.2:9^
511-
*ffi
111!
J
0.061
0.17
0.060 0.17
0.064
0.20
snctfroniG) ,/TUFA Att/cco
Wood Shingles
/HEAtHlNG-)
Stucco A
1 in. Wood*
X in. Rigid Insulation* X in. Plaster Board*
1 in. Wood*
X in. Rigid Insulation X in. Plaster Board
0.25 0.19 0.24
0.26 0.20 0.25
0.25 0.19 0.24
0.19 0.15 0.19
0.15 0.12 0.15
0.11 0.10 0.11
0.19 0.16 0.19
0.19 0.16 0.19
0.061 6.057 0.061
0.17 0;14 0.17
0.30
0.31
0.27
0.29
0.40
0.43
0.30 ; 0.22
0.27
0.20
0.40
0.26
0.16
0.12
0.16
0.12
0.19 ; 0.14
0:22 0.21 0.28
0.22 0.21 0.28
0.064 0.062 0.067
0:20 0.19 0.24
1 in. Wood*
Brick/ Veneer
X in. Rigid Insulation
/KCAIKMG'
X in. Plaster Board
"Computed from factors marked by * in Table 2, *These coefficients may also be used with sufficient accuracy for plaster on wood lath or plaster o plaster board. Based on the actual width of 2 by 4 studding, namely. 3% in.
116
0.27
0.28
0.27
0.20
0.15
0.12
0.21 s ...0.21
0.062
0.18
0.25
0.26
0.25
6.19
0.15 ' 6.11
0; 19 o;2tr 0.061
O.lfT
0.35
0.37
0.35
0.24
0.18 . 0.13
0.25
0.25
0.066
0.22
*Yellow pine or fix--actual thickness about H6. in.
Furring strips between wood shingles and sheathing. /Small aif space and mortar between building paper and brick veneer neglected.
;
A waterproof membrane should be provided "between the outer material and the insula on prevent possible wetting by absorption and a subsequent lowering of efficiency.