Document X7V9105JbEwnnDdxppabkxjBG

7`- r 77-7 T ' Number Number American Society 0/ Heating and Ventilating Engineers Guide, 1931 Table 18. Coefficients of Transmission (U) of Concrete Walls with No Exterior Finish 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 ARE BASED ON AN OUTSIDE WIND EXPOSURE OF 15 MILES PER HOUR. Thevaluesof Urn thisTable are basedonthefol lowtnq Internal ConductivitiesorConductances which are evpressedinB.t>u.pert4r per^.Fb per l*F Concrete(Stooe ltl:4mnc) 8.30 perl" Plasterboard. 3.75 per J* Plaster (Gvpsum) 2.32 perl* Wood Lath 4 Plaster 200 asapplied Cork board 0.30 per T Riqtd Insulation (Boardform) 0-33 perl" Cellular Gypsum (-18*) 0.5*1 per 1" Flaked Gypsum, Dry (24*) 0.48 perl" * ' c> o * 4 - * -c / p . &o ' * /'*. il Y Thickness of Insulation where specified Interior Construction 1 Ram Walls - No Interior Finish Y A Thickness of Concrete --X. 8" IO' 12" 16" 20' B c DE F 0.583 0.512 0455 0411 0.345 0.214 L ^Plaster on Concrete 0.518 044)1 0416 0.378 0.320 0177 3 ^ PIasteron Metal Lath -- Furred 0.331 0314 0212 0273 0-241 02l: 4 ^ PI aster on Wood Lath -- furred 0.320 0.217 0227 0.260 0.231 0.208 5 ^^Raster on Plaster board-Furred 0:322 0.211 0.171 0.261 0232 aTtor 6 ^Plaster on Wood Lath on 2* Furrinq Strips -Cellular Gypsum Fill b a f 0.202 0.112 0.183 0.176 0.162 0.151 7 i Raster or Wood Lath on 2 Furrinq Strips -- FlakedGypsum Fill v. a >4* 0.127 0170 0.163 0.157 0146 0137 8 J Raster on Rtqid Insulation (Board form) Furred 1 10 Plaster on Corkboard Set in k Cement Mortar II 1" 2 0.221 0.217 0207 0.117 0.180 0.166 r 0.170 0.164 0.157 0.152 0.141 0.132 0-142 0,138 0.134 0.131 0.122 0.116 2 0.116 0-113 0.101 0.106 0.101 0.017 aBased on 1% in., the actual thickness of 2 in. furring strips. bThe coefficient used for cellular gypsum, 0.59 is for. 18 lb. weight--weights as low as 12 lb. may be used. \ 54 Chapter 3--Heat Losses by Transmission Table 19. Coefficients of Transmission" (/) of Cinder and Concrete Block Walls b-d fj. ___These coefficients are expressed in B.t.u. per hour per square foot per 1 deg. fahr. ORNCB IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARE BASED ON AN OUTSIDE WIND of 15 MILES PER HOUR. Thevalues of U in this Table are basedonthefollowinq Internal Conductivities or Conductances which are expressed in B Lu. per Hr per Sq.Ft. per t"F Cinder Blochs 8`=0.45 Concrete Blochs 8'= 0-64 I2"-0.Z8 tl'=O.S. Cement Mortar Plasterboard 800 per 1' 3.73 per-g Raster (Gypsum) Wood Lath 4 Plaster Cork board Ciqid Insulation (Boardform) Cellular Gypsum (18*) flahed Gypsum, Dry (Z4 ) 2.32 perl" 2.00 asapplied 0.30 per 1" 0.33 perl" 0.58 perl" 0.48 perl" JL-I Y=Thictnessof Insulation where specified Interior Construction Thickness-X and Kind of Blocks Y SCinder- 8 Concrete 12 Cinder ^Concrete A B cD i Rain Walls -- No Interior Finish 0.311 0.458 0.211 0.343 2 2 Plasteron Blochs \3 Plasteron Metal Lath - Furred 0.211 Q416 0.201 0.311 0.225 0.Z13 0.173 0.241 4 ^Rasteron Wood Lath - Furred 0.216 0.278 0.167 0.231 5 5 Rasteron g Plaster board-Furred 0.217 0.280 0.168 0.232 4: a 6 RasteronWd Lath on 2* FurnnqStnps - Cellular Gypsum Fill c if" 0.155 0.184 0.128 0162 \a 7 Plaster on Wood Lathon 1 Furrinq Strips - Flaked Gypsum Fill if 0.140 0.163 0.118 0.146 Y8 Raster on Rtqid Insulation-- (Boardform) Furred 1 I* Z 0.171 0.207 0.131 0.180 r 0.136 0.158 0.114 0.141 10 Plasteron Cork board set in y Cement Mortar II if 0.118 0.134 0.102 0.122 2" 0.018 0.101 0.087 0.101 Based on 1$ in., the actual thickness of 2 in. furring strips. bThe figures on this page may be used with sufficient accuracy for cinder and concrete block walls with stucco exterior finish. i "The coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. _ "The form of the 8 in. blockson which the figures in this table are based is shown in the above sketch, I he 12 in. blocks are based on two air cells through the block instead of one. 55