Document k9mm4Rzav8139YER1XVZQ2vaV

American Society of Heating and Ventilating Engineers Guide, 1928 Table 6-H. Coefficients of Transmission (U) of Various Types of Masonry Wall Construction Note.--These coefficients are expressed in B.t.u. per hour per square foot per i 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. 4" CUT STOOE VE.UEE.C. OKI CoUCfcETE WALLS The values cf U in this Table are baaed on the /bUowmq Internal Conductivities (C) which are expressed m B.t.u. per Ur. per Sq.ft, per l* f Stone 10.00 per t' Concrete (Stone Ul'.4 mix) &W per I' Cement Mortar Plaster Board Plaster (.Gypsum) 8.00 per f ' 3.04 per f l.'il per l' Wood Lath f Plaster Cork board 2.00 as applied 0.30 per 1* fiber Insulation (board/brm)' 033 per l* Cellular Cypsum (18*) 0.59 per l' Powdered Cypsum (26*) . 0.52 per W all Uumber Y-Thickrtess qf Insulation where specified Interior Construction 78 Plain Waite - Uo Interior finish 7^ Plaster on Concrete Thickness o/ Concrete -X. Y (o' a. 6* 10* u* 16* bc d e 0.454 6.41$ 0.377 0.345 0.296 0418 0.380 0.348 0.321 0.279 80 J Plaster on Uefcal Lath - Purred 0.251 0.236 0.-224 0.212 0.193 81 Plaster on Wood Lath - furred O.Z40 0227 0.215 0.204 0.186 82 i* * T Plaster on % Plaster Board - Purred Plaster on Wood Lath on 2* Furrinq 83 Strips -Cellulur Cypsum Pill ^ plaster on Wood Lath on. Z* Furrinq 84 strips - Powdered Gypsum f\U 85 5i"* Piaster on Fiber Insulation -- (Board form) purred 86 87 Plaster.on Cork board.. 5et In fi. 88 Cement Mortac 0.249 0.235 0.223 0.211 0,192 % yii 0.184 -0.176 0.169 0.163 0.151 V 0172 0.166 0.159 0.153 .0-143. yi 0.185 i-- 0.145 0.177 0.170 0.140 0.135 0.163 0.151 0.131 0,123 tVz 0.134; 0.130 0.126 . 0.122 o.n'6 T 0.110 0.107 0.104 0.102 0.047 Based on in., the actual thickness of 2 in. furring strips. 28 Chapter I--Calculating the Heat Losses from Buildings Table 6-1. Coefficients of Transmission (U) of Various Types of Masonry Wall Construction tfofgj---These coefficients are expressed in B.Lu. per hour per square foot per I 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. CchJchete Walls WITH .t Stucco AS EXTE.(210(1. flMlSH The values of U in this Table are based on the following Internal Conductivities (C) which are etpressed in &ta. per I4r. per'Sg.Ft. .per lF Stucco . 800 per 1* Concrete (Stone 1:2:4 mu) 8.10 per !' Plaster board 3.04 per f Plaster (Gypsum') Wood Lath 4 Plaster 2.12 per I" 2.00 as applied CorL board 0.10 per l` fiber. Insulotion (fcoard/brm) 0.11 per 1' Cellular Gypsum (18*) 0.54 per P Powdered Gypsum (26*) 0.52 per 1 4 V;' . * te, Y- Thictness of Insulation where speci/ied __S> -2 e interior Construction Y r stucco oo Wire -- Thickness of Concrete - X 6" . 8' 10- ir a bcd 16' 20' eF 89 .Plain Walls - Uo Interior Finish 0.515 0.481- 6.431 0.391 0.329 0.284 90 & Plaster on Concrete 0465 0.437 0.395 0.361 0.308 0.268 91 % Plaster on Metal Lath - Furred . 0.267 0:257 0.242 0.229 0.206 0.231 92 14 Plaster on Wood lath - Purred 0.254 0.246 0.232 0.220 0.199 0.181 93 Vi Plaster on % Plaster board - Furred 0.265 0.256 .0.241 0.228 0.205 0.187 * 94 & Plaster on Wood Lath on 2*Furrinq Strips - Cellular Gypsum Fill l* 0.193 0.188 0.179 0.172 0.159 0.148- + 95 ft Plaster on Wood Lath on Z* Furrwq Strips - Powdered Cypsum Fill i% 0.180 0.175 0.168 0.162 0:150 6:140 96 YL Plaster on Fiber Insulation (board form) Furred 97 98 Plaster on CorL board set m 'A Cement Mortar 99 Vi 0.194 0.189 0.180 0.173 0.160 0.148 f 0.150 0.147 0.142 0.137 0126 0.121 lit' 0.138 0.136 0.132 0.127 0.120 0.114 2" 0.113 0.1 El 0.106 0.105 0.106 0.046 Based on 1% in., the actual thickness of 2 in. furring strips. fThe figures on this page may be used with sufficient accuracy for plain concrete walls without stucco.