Document 3KqmLx38wO6eRGjxYn0zpmj6

American Society of Heating and Ventilating Engineers Guide, 1931 Table 12. Coefficients of Transmission (U) of Hollow Tile Walls with Stucco Exterior Finish t>-d Note.--These coefficients are expressed in B.t.u. per hour per square foot per 1 deg. fahr. DIFFERENCE IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARB BASED ON AN OUTSIDE WIND EXPOSURE 07 15 MILES PER HOUR. The values of UinthisToble are basedon the followmq Internal Conductivities or Conductances which are expressedin B-t.U. per Ur perSq.Ft.per l*F Stucco 8.00 perl* MallowTile 8*-0-43 lO**0.46 l2"-aS3 IGNo.25 Cement Mortar 8.00 perl`_ Raster board 3-73 per4" Raster (Gypsum) 2.32 perr VJpod Lath 4 Raster 2.00 os applied Cork,board 0.30 perl* Eiqid Insulation (Boardform) Celtular Gypsum (18*) 0.33 perl* an perf Flaked Gypsum, Dry(24*) 0.48perl' r=r< Number Y Tbicknessof Insulation where specified Interior Construction i Ram Walls - No Interior Finish Tbicknessof WollowTile -- X Y 8` IO" 12" 16" A B C D. Q317 a 304 0.241 0145 i2 Plaster on Hollow Tile %3 Plasteron Metal Lath -- Purred 0246 0.285 0224 0.188 0.228 0.221 0.186 0.158 A Y Placer on Wood Lath -- Furred 0.218 0213 0480 0.153 5 Raster on Plaster board--Furred. <o 4 Rasteron Wood Lath on 2" Furrmq Strips -- Cellular Gypsum Fill c 0220 0.213 a if- QI5fc> 0.153 0.180 0-153 0.135 0.120 7 X Rasteron Wood Lath on 2* Fumnq Strips -- Flaked Gypsum Fill N. 8 g Rasteron Qtqid Insulation -- q (Boardform) Furred a |" '8 0.141 0.138 0.124 o.m 1" 2 0.172 a 168. 0.147 0.124 1* 0.157 0.134 0.120 0.108 io Plaster on Cork board set m -t Cement Mortar h 0.114 0.117 0.106 0.046 2* doqq 0.048 0.040 0.083 aBased on 1% in., the actual thickness of 2 in. furring strips. ^Figures on this page can be used with sufficient accuracy for hollow tile walls without stucco finish. cThe coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. dThe 8 in. and .10 in. tile figures are based on two cells in the direction of heat flow. The 12 in. tile is based on three cells in the direction of heat flow. The 16 in. tile consists of one 10 in. tile and one 6 in. tile, each having two cells in the direction of heat flow. 48 Chapter 3--Heat Losses by Transmission Table 13. Coefficients of. Transmission (J/) of Limestone or Sandstone Walls .. . __these coefficients are expressed in B.t.u. per hour per square foot per 1 deg. fahr. RkWce IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARE BASED ON AN OUTSIDE WIND EXPOSURE OF 15 MILES PER HOUR. The.valuesof U in this Table are basedon the followinq Internal Conduct**-, crConductances which arC per'***& Cement Mortar 6.00 peer Plasterboard Plaster (Gypsum) Per* 2.32 perl Wood Loth t Plaster 2.oo as ojylied Corkboard , 0.30 perl. Eiaid Insulation (Boardform) 0.33 per 1 Cellular Gypsum (-) FlakedGvpsum,Dry(24*) ^ 0.48 perl yi V- TWkness of Insulation where specified b Interior 5zf Construction a 1 Plain Walls -No Interior Finish Y 8" A Thickness of Stone-X IO' 12." 16" 20* B c DE Z4" F 0.558 0.502 0.457 Q"385 0.334 0.245 2 Plaster on Stone 0.447 0-452 0.415 0.354. 0.311 Q277 3 3- Plaster on Metal Lath -- Furred 0.330 0-310 0.242 0.261 0.136 0.216 4 Plaster on Wood Lath - Furred 0.312 0.244 0-277 0.250 0.227 0.208 5 j Plasteron Plaster board-Furred 0.314 0245 0.274 025 i 0.228 0.204 j Rasteron Wood Lath on 2 Furrinq 6 Strips-Cellular Gypsum Fill b a >r 0.148 0.141 0.184 0.171 0.160 0450 2 Raster on Wood Lath on 2*' Furrinq 7 Strips -- Flaked Gypsum Fill a >r 0.175 0.14.4 0.14.3 0.153 0.145 0,137 8 Plaster on R.iqid Insulation (Board form) Furred 4 10 \ Plaster on Corkboard set in-Jr Cement Mortar 11 i" z 0225 0.216 0,207 0.141 0.177 0.1&6 i" 0.14.8 0.14.3 0.157 0148 0.140 0.13Z 4* 0.141 0.138 0.134 0.127 0.121 0.115' z' 0.114 0.112 0.104 0.105 0.101 0.048 Based on 1% in., the actual thickness of 2 in. furring strips. tThe coefficient used for cellular gypsum,-0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. 49