Document 82xzjegYMwLOYVj6VoYd7mj2e
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Chapter 4
1945 Guide
I ' Table 4. Coefficients of Transmission (I/) of Frame Walls
Coefficients are expressed in Btu per hour per squarefoot per degree Fahrenheit difference in temperature' between the air on the two sides, and are based on a wind vdocity of 16 mph.
No Insulation Between Studs4 (See Table 5)
EXTERIOR FINISH
INTERIOR FINISH
TYPE OF SHEATHING
Gypsum
0-6 IBthick)
PlyWOOD (`ini. thick)
Wood/ (H4ra. thick) Bldg.
Papes*
Insul-
ATING Board ("-6 m. thick)
ABCD
s s
Z -ja .
<
65
Wood Siding (Clapboard)
*/atTtUMC
Metal Lath and Raster*......... ....._................... 0.33 032 0.26 6.20
1
Gypsum Board in.) Decorated.................... 0.32 032 0.25 030
2
Wood Lath and PlMto,,,,, ,. ,,_________ ___ 0.3) 031 0.25 0.19
3
Gypsum Lath (34 in-) Plastered*__ ;....... ...... 031 031 035 0.19 . 4
Plywood (34 in.) Plain or Decorated........ ....... 030 030 0.24 0.19
5
Insulating Board (34 in.) Plain or- Decorated.... 0.23 033 0.19 0.16 . 6
Insulating Board Lath (34 in.) Plastered*____ 0.22 032 0.19 0.15
7
Insulating Board lath (l in.) Plastered*.,,....... 0.17 0.17 0.15 0.12
8
Wood* Shingles
SlVUA
Metal Lath and Piaster*.... ........... _.................. 035 035 036 0.17
9
Gypsum Board (34 in.) Decorated................... 0.25 035 0.25 0.17 10
Wood lath and Piaster..................................... 034 034 035 0.16 11
Gypsum Lath (34 in.) Plastered*-_____ --....... 034 034 035 0.16 12
Plywood (K in.) Plain or Decorated........ -...... 034 034 034 0.16 13
Insulating Board (34 in.) Plain or Decorated.... 0.19 0.19 0.19 0.14 14
Insulating Board Lath (H in.) Plastered*____ 0.19 0.18 0.19 0.13 15
'Insulating Board Lath (1 in.) Plastered*_____ 0.14 0.14 0.15 0.11 16
/HEATHtHG)
\
Stucco
Metal Lath and Plaster*........... ........................ 0.43 0.42 032 033 17
Gypsum Board (34 in.) Decorated...... ... .......... 0.42 0.41 031 033 18
Wood Lath and Plaster......... ..... ..... ................. 0.40 039 030 032 19
Gypsum Lath (44m.) Plastered*....... .-.----------- 039 039 030 032 20
Plywood (M ini) Plain or Decorated............. . 039 038 039 0.22 ' 21
Emulating Board (34 in.) Plain or Decorated.... 037 037 0.22 0.18 22
Insulating Board Lath (34 in.L Plastered*
036 036 032 0.17 23
Insulating Board Lath (1 in.) Plastered*-........ 0.19 0.19 0.16 0.14. 24
Buck Veneer*
/tufa M-tot Metal Lath and Plaster*.--..--.------------ ------ 037 036 038 031 25
Gypsum Board (34 in.) Decorated-.-
036 036 . 038 0.21 28
Wood Lath and Plaster--:
035 034 037 030 27
Gypsum Lath (34 in.) Plastered*^..................... 034 034 037 030 28
Plywood (34 in.) Plain or Decorated___ -......... 034 033 037 030 29
Insulating Board (34 in.) Plain or Decorated.... 035 035 031 0.17 30
Insulating Board Lath (34 in.) Plastered*--..... 034 034 030 0.16 31
Tnunlnting Board lath (1 in.) Plastered*--.___ 0.18 0.18 0.15 0.13 32
/H CATKIN G'
Coefficients not weighted; effect of studding neglected. *PIaster assumed 3i in. thick. Plaster assumed 34 in. thick. *Furring strips between wood shingles and all sheathings except wood. Small air space and mortar between building paper and brick veneer neglected. /Nominal thickness, 1 in.
Heat Transmission Coefficients
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Table 5. Coefficients of Transmission-(7) of Frame Walls with Insulation Between Framing4*1*
Coefficients are expressed in Btu per hour per square'foot per degree Fahrenheit difference in temperature
between the air on the two sides, and are based on a wind vdocity of 16 mph.
-
COEFFICIENT
with NO INSULATION
BETWEEN FRAMING
COEFFICIENT WITH INSULATION BETWEEN FRAMING
Blanket os Bat Insulation between Framing* (Thickness below)
1 IN. 2 IN. 3 IN.
334 in. Loose Mineral Wool
between Framing
tss Z
A B .c D
0.11
0.078
0.064
0.056
0.051
33
0.12
0.083
0.067
0.057
0.054
34
0.13
0.088
0.070
0.059
0.056
35
0.14 0.092
0.073
0.061
0.058
38
0.15 0.097
0.075
0.062
0.059
37
0.16 0.10 0.17 0.10 0.18 0.11 0.19 0.11 030 0.12
0.077 0.080 0.082 0.084
0.087
0.065
0.066 0.068 0.069 0.070
0.060 0.062 0.063 0.064
0.066
38 ` . 39
40
41
42
031 0.12 0.22 0.12 033 0.12 0.24 0.12 035 0.13
0.088 0.090 0.093 0.094
0.095
-0.072 0.073 0.074 0.076 0.076
0.067 0.069
0.069 0.070
0.072
43 44
45 ' 46
47
036
0.13 x
0.096
0.077
0.072
48
037 0.14
0.097
0.078
0.073
: 49
038 0.14
0.098
0.078
0.073
50
039 0.14
0.10
0 080
0.075
51
030 0.14
0.10
0.080
0.075
52
031 0.14
0.10
0.082
0.076
53
032 0.15
0.10
0.082
0.076
54
033 0.15
0.11
0.083
0.077
'ss
034 0.15
0.11
0.083
0.078
56
035 0.15
0.11
0.085
0.078
57
036 0.16
0.11
0.085
0.079
58
037 0.16
0.11
0.087
, 0.080
59
038 0.16
0.11
0.087
0.080
60
039 0.16
0.11
0.087
0.081
61
0.40 0.16
0.11
0.088
0.082
62
0.41 0.42
0.43 0.44
0.16
0.16 0.17
0.17
o.n
0.088
. 0.082
63
0.11
' 0.088
0.082
64
0.11
0.090
0.083
65
0.12
0390
0.083
66
This table may be used for .determining the coefficients of. transmission of frame constructions with
the types and thicknesses of insulation indicated in Columns A to D inclusive between framing. Columns
A, B and C may be used for walls, ceilings or roofs with only one air space between framing but are not
applicable to ceilings with no flooring above. (See Table 10.) Column D is applicable to walls only.
Example; Find the coefficient of transmission of a frame wall consisting of wood siding, in. insulating
board sheathing, studs, gypsum lath and plaster, with 2.in. blanket insulation between studs. According
to Table A, a wall of this construction with no insulation between studs has a coefficient of 0.19 (Wall No.
4D). Referring to Column B above, it will be found that a wall of this value with 2 in; blanket insulation
between the studs has a coefficient of 0.084.
* **
bCpefficients corrected for 2x4 framing, 16 in. o. c.--15 per cent of surface area.' -
Based on one air space between framing.
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