Document 3eyzxGGwXO0MZpzpxz7bqBoRx
American Society of Heating and Ventilating Engineers Guide, 1935
Table 5. Coefficients of Transmission (IT) of Various Types of.Frame Construction
These coegicients/are expressed in Bin per hour per square foot per degree Fahrenheit difference in temperature between the air on the two sides;-and are based on a wind velocity of 15 mph.
Chapter 5__ Heat Transmission Coefficients And Tables
.----r--
interior finish No Insulation Between Studding
Inbulatic N BETWEBr Studdino
TYPICAL CONSTRUCTION
EXTERIOR FINISH
TYPE OF SHEATHING
1 in. Wood*
r.
Wood Siding or Clapboard K in. Rigid Insulation
K in- Plaster Board
a
2 c X i co
3V
4l|
til
-i
0.25 0.23 0.31
' 1Xo!
Ss
*3. eo tao d-d
i!
B 0.26
3v*o Kw
C
0.25
0.24
0.23
0.33
0.31
Plaster { H in.) on metal lath on
studding
Plaster( i i (H in.) on rigid insulation in.) on studding ' No piaster--decorated rigid or build
ing board interior finish. (H in.) Plaster ( H in.) on metal lath-- stud
space faced one side with bright aluminum foil
D 0.19
do d
a
T3 *5>`C
H- - ---o S-3
&! 1C CL,
E
0.15
a 5
-o .S
M oo oa d
5W1O
fc a J| CU o
F
0.11
0.18
0.14
0.11
0.22
0.17
0.13
G 0.19
H 0.19
0.18
0.18
0.23 ; 0.23
s 2*
Ba
T.
*r
bii |ls Oh
I
-
.S-| Sx-s
$& 8
od.Sq>-. aa~ ^x a .5 "3 *3
S7l,, jlf1 .11!!;;:
j
0.061
0.17
0.060
0.17,
0.064
0.20
Wood Shingles : . .
1 in. Wood* H in. Rigid Insulation*,
44 % 0.25 0.26
43
0.19
0.20
0.25 0.19
0.19 0.15
0.15. o.n
0.12
0.10
i0.19
.0.19
0.16
0.16
0.061 .0.17 - t.
0.057
0.14
; sHCAmutia)
^ in. Plaster Board.* :
, 44
0.24
0.25
0.24
0.19
0.15
0.11
0.19
0.19
0.061
0.17
jtvccq
I in. Wood* ;
1
47
0.30
0.31. 0.30-
0.22
o:i6 - 0.12
0.22 . ,0.22-
0.064
0.20
Stucco
^ in. Rigid Insulation
4J |
0.27
0.29
0.27
0.20
0.16
0.12
0.21
0.21
0.062
0.19
/.TPiTA ftUCKy
H in. Plaster Board
4i |
0.40
0.43
0.40
0.26
0.19
0.14
0.28
0.28
0.067
i.in. Wood*
.::.C :.5 1
0.27
0.28
0.27
0.20
0.15
0.12
0.21
0.21
0.062
0.24 0.18
Brick'jVeneer
H in. Rigid Insulation
51 I 0.25 .0.26
0.25
0.19
0.15
0.11
0.19
0.20
0.061
0.18
yi.in. Plaster Board.
-51 |
"Computed from factors marked by * in Table 2.
*These coefficients may also be used with suffffiicciieeint accuracy for plaster on wood lath or plaster
plaisstter board.
.-j -
Based on the actual width of 2 by 4 studding, namely, 3% in.'
104
0.35
0.37
0.35
0.24
0.18
0.13
0.25
0.25
0.066
0.22 .
4Yellow pine or fir--actual thickness about in.
'Fumng strips between wood shingles and sheathing..
'Small air space and mortar between building paper and brick veneer neglected.
#A waterproof membrane "should be provided between the"outer material and .the insulation filltorhrevent possible wetting by absorption and a subsequent lowering of efficiency.