Document DGnMk9xw4z9x9vVVnoxBQ0zwB
American Society of Heating ayd Ventilating Engineers Guide, 1929 \
Table 7-C. Coefficients of Transmission (77) of Various Types of Masonry Wall Construction
Note.--These coefficients are expressed in H.t.u. 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.
fctzicx. VeUeee. ou couceete Walls
The valued of Unn this Table are based on the
foliowmq Internal Conductivities (C) which are
expressed in &.t.u. per Ur. per Sq.ft. per lf
Concrete (Stone V-V.4 m\x) 8.30 per f
6>rtck.
5.00 per l"
Cement Mortar
8.00 per f
Plaster board.
3.04 per 1*
Plaster (Gypsum)
2.32 per 1*
Wood Lath 4 Plaster
. 2-00 as applied
Cork board.
0.30 per 1"
Tiber Insulation (board fbrm) . 0.33 per V
Cellujar. Cypsum (18*) ----- 0.59 per t`
flaked Gypsum, Dry (26) 0.52 per l
Y-Thickness of Insulation where <3pec0ed
Sa>> =d 3 52
Interior Construction
Y
23 Plain Walls - VJo Interior finish
Cement \ Uortar
Thickness cf Concrete-X 6" 8' 10* 12" l <o a bC de
0.387 0.355 0.327 0.303 0.264
24 X Piaster on Concrete
0.358 0.330 0.305 0.285 0.250
25 JPIaster on Metal.Lath -Furred
0.228 0.216 0-205 0.185 0.173
26 j Plaster on V/ood Lath -- furred
0.Z13 0.208 0.188 0.163 Q173.
27 j Plaster on "Vs Plaster board -- furred Plaster on Vbod Lath on 2* furrinq
28 Strips -- Cellular Gypsum fill Plaster on Wood Lath on 2" furrinq
29 strips - l flaked Gypsum fill x
0.226 0.215 0.204 0.135 0.178
* [% 0.172 0.165 0.158 0.152. 0.142
1% 0.161 ' 0.155 0.150 0.145 0.135
30 Plaster on fiber Insulation (board form} furred.
:3l
32 7. Plaster on Cork board Set in Yi
33 Cement Uortar
^
W. 0.172 0.165 0.153 0.153 0.144 r 0.137 0.132 0.128' 0.124 0.117 l'A" 0.127 0.123 0.120 0.116 0.110 2` 0.105 0.102 0.100 0.098 0093
Based on 1% in., the actual thickness of 2 in. furring strips. Note.--The coefficient used for plasterboard is 3.04 per inch thickness--recent data indicate values as low as 1.30 for this material. Note.--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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Chapter I--Heat Losses from Buildings
Table 7-D. Coefficients of Transmission (17) of Various Types of Masonry Wall Construction
Note.--These coefficients are expressed in H.t.u. 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.
Hollow/ Tile Walls with Stucco Exteetoe. fitJisw *
The values of U n this Table are based on the /fcllowinq Internal Conductivities (C) which are
Stucco
8.00
Hollow Tile 6-0.50 8(X43 12-0.26
Cement Mortar
8.00
Plaster board.
3.04
Plaster (Gypsum)
2.52
Wood Lath 4 Plaster
2 .00
Cork board
0.30
fiber Insulation (board form) 0.33
Cellular Gypsum (18*)
0.59
riaked-Qypsam, Dry (26* ) 0.52
per I* iG-aiss perl* perl' per 1*
is applied per 1*
per l\ per 1* perl"
V-Thickness cf Insulation where speci/ied
Interior ^ I Construction 52
Thickness of UollowTtle -X
8* IZ 16*
34 Plain Walls -- Uo Interior Finish
Oi3ZO 0.231 0.201 0.153
35 \ Plaster an Hollow Tile
O.Z53 0.273 0.153 0.145.
36 ^Plaster on Metal Lath -- Purred
0.203 0.150
0.147
G.I20
37 x Plaster on Wood Lath -- Purred
0.136 0.184
0.144
0117
38 X Plaster on Ye Plaster board - Purred
0.202 0.150 0.147 0.120
35
z Plaster on Wood Lath on Z" Furrinq Strips - Cellular Gypsum Pill
1%. 0.157
40 r Plaster on. Wpod_Lath on Z* Furrinq Strips - Fluted Cypsum Pill
1%
0.148
0.143 0.142
0.I2Z 0.116
0.102 0.033
Plaster on Fiber Insulation (Board form) Furred
0.158 0.127
0.150 O.IZZ
0.122 0.103
0.103 0.083
Plaster on Corkboard set vn Vz'em.ent Mortar
0.1 IT 0.099
aii5 0.096
0.098 0.084
0.085 0.074
Based on 1% in., the actual thickness of 2 in. furring strips. tFigures on this page can be used with sufficient accuracy for hollow tile'walls without stucco finish. Note.--The coefficient used for plasterboard is 3.04 per inch thickness:--recent data indicate values as low as 1.30 for this material. Note.--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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