Document Lgor9xnD5OepzDvEy3BeGVomd

American Society of Heating and Ventilating Engineers Guide, 1930 Table 21. Coefficients of Transmission (IJ) of Concrete Walls with No Exterior Finish NoU.--Tbsse coefficients are expressed in B.t.u. per hour per SQUARE foot per 1 nrr ihe a,r on t,ie 7> evaluesdf U in thisTable are basedonthefbllowinq in recnai Cbnducfrvihes orCboductanoes which are e>cpnessedin&.tu.perWn per^.Fb per l*F Concrete(Stone 1-2:4mix) 8.30 perl- Plasterboard 3.75 per^* Plaster (Gypsum) 2.3Z peri' Wood Lath 4 Plaster 2.00 as applied Cork board 0.30 perl' Riqtd Insulation (&oardform) 0-33 perl' Cellular Gypsum (18#) 0.5S perl- .Flaked Gypsum, Dry (24*) 0.48 perl" JL----j * - *L> O , r d, * t; 4 i>. r:. . a . 0 V* Thickness of Insulation where specified VV _o Interior E3 Construction 2 Y er A Thickness of Concrete--X 8' IO" . 12" I>" 20" B c DE F i Plain Walls - Mo Interior Finish 0.583 0.512 0.455 0.411 0.345 0.274 2. 2 Plaster on Concrete 0.518 0.461 0.416 0.378 0.320 0.277 3 1 Raster on Metal Lath - Furred 0.337 0.314 0-272 0.273 0-241 OZtJr 4 5 Raster on Wood Lath - Furred 0.320 0.277 0.217 Q260 0.231 0.208 5 Ptaster on ^ Pla-ster board- Furred 0.322 0.277 0.273 0261 0232 0267 6 T Raster on Wood Lath on 2 Furrmq Strips -Cellular Gypsum Fill ^ a `I' 0.20Z 0.172 0.183 0776 0762 075( ' t" 7 z Plaster on Wood Lath oh 2 Furnnq Strips -- Flaked Gypsum HU a C 0.177 a 170 0.163 0.157 0146 0137 8 2 Plaster on Riqid Insulation ~ (Boardform) Furred 0.227 0.217 0.207 0.177 0.180 0766 ; r 0.170 0.164 0.157 0752 0741 0732 10 2l" Raster on Corkboard set in l" 0.142 0.138 0.134 0.131 0.122 0.116 11 2" 0.116 0713 0.107 0.106 0.101 0.077 l Based on 1% in., the actual thickness 'of 2 in. furring strips. SThe coefficient used for cellular gypsum. 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. 44 Chapter 2--Heat Losses from Buildings Table 22. Coefficients of Transmission (U) of Cinder and Concrete Block Walls *>-d Mote.--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 OP 15 MILES PER HOUR. Thevaluesef U inBusTable are basedonthefbllowmq Internal Conductivities or Conductances which are expressed tn Btu. per Hr per Sq.Ftper TF Cinder Blocks 8"*>0.45 Concrete Blocks 8`*0.fe4 Cement Mortar Plasterboard 1Z'=0.Z8 Tl'-O.SZ. 8.00 per I" 3.73 perg" Plaster (Gypsum) Wood Loth 4 Plaster Corkboard RtqidInsulation(Boandform) CellularGypsum (IS*) flaked Gypsum, Dry (24* ) 2.32 per l" 2.00asapphed 0.30 perl"' 0.33 perl" 0.58 per I" 0.48 perl" Y=TViicknessof Insulation where specified Interior Construction Thickness -- X. and. Kind of Btocks SCinder 8 Concrete 12 Cinder l2Concrete Plain Walls - No Intenor Finish 5 Plaster on Blocks T Plasteron Metal Lath - Furred L Plasteron Wood Lath - Furred i Plaster on | Plasterboard- Furred 0.311 0.458 o.m 0.343 0.271 0.41G 0.207 0.317 a0.225 0. 273 173 0.Z41 0.2 16 ai78 0.167 0.231 0.217 0.280 0.168 0.232 7 Plasteron Wbod Lath on 2* FurrmqStrips -Cellular Gypsum Fill c 0.155 0.184 0.128 0162 ^ Plaster on Wood Lathon2 Fumnq Strips - Flaked Gypsum Fill 0.140 0.163 0.U& 0.146 Plaster on Riqid Insulation-- (Boardform) Furred 0.171 0.136 0.207 0158 0.137 0.180 0.114 0.141 10 - |* x Plastjeron Corkboard Set in Cement Mortar II 0.118 0.134 0.102 0.I2Z 0.0% 0.107 0.087 0.701 . ftBased 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 withTshtuecccooeeffxictieerniot rusfiendisfho.r cellular gypsum. 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. <*rhe form of the 8 in. blocks on which the figures in this table are based is shown in the above sketch. The 12 in. blocks are based on two air cells through the block instead of one. 45