Document RJgEN4nBrRaOwvR4yQ2w8gn1z

American Society 6} Heating and Ventilating Engineers Guide, 1930' Table 29 Coefficients of Transmission (U) of Frame Construction Floors and Ceilings Holt__These coefficients are expressed in B.t.u. per hour per square foot per 1 dec. fahr. difference in temperature between the air on the two sides and are based on stiu^air (no wind) conditions on both sides. The values of U in this Table are basedon thefollowing Internal Conductivities or Conductances which are expressed in B.t.u. per Ur. per Sq.ft, per I*F wood (Yellow ftne or Fir) 1.00 per I* Wood(Maple) 1.20 per j* Plaster (Gypsum) 2.32 per I Plasterboard 3.73 per"i;* Wood Lath 4 Plaster 2.00 asappMl Cork, board. 0.30 per V B.iqid Insulation (boardform) 0.33 per \* Cellular Gypsum Ql8*) 0.5*! per I* Flaked Gypsum,Dry (16W) 0.34 per f Flexible Insulation 0.27 per V Typical Construction Flooring- Ceilmcj Type u -D or Ceilinq 5 3 -z ' Insulation between Joists Type of Flooring Mo Flooring A C Yellow Pineb T Yellow Rne b & Maple brOak Flooring Flooring On-j" floorinqon V on joists Rtqidlnsulation Yellow Pine (board fora) Sub-floonnq on Joists on Joists B co i. Ho Ceilinq None 0.440 0.264 0.334 2. Metal Latb f Plotter ($) None 3 Wood Latb $ Plaster^") Hone 0.551 0.502 0.248 0.272 0.200 0.142 0.234* 0.230 :4 * Plader board |Plaster (i") Hlone 5 -yfrjatd Insulation (Board form) Wane 4 Plaster <V) Wood Lath f 6 Plaster (-j") f flexible * Insulation Wood Latb 4 1 Plaster (V) Insulation (bodrdform) A aF,ii(r)Wood Latb 4 8 Plaster Cellular Gupsum *- . Wood Lath 4 Flaked. Gypsum Planter ( ) mi (n c ft")10 Cork board 4 Plaster None II 2" Cork board. Plaster (4") klone 0.506 0.310 0.210 0.226 0.186 0.127 o.i4q am 0.273 0.204 0.155 0.163 0.141 0.105 0.114 0.100 0.143 0.156 0.126 0.131 0.117 0.040 o.iol 0.087 0.230 ' 0.174 0.140 0.148 0.124 0.048 0.110 0:043 The value of U is the same if insulation is applied to underside of joists and lath and plaster ceiling .separated by furring strips. bBased on actual thickness of approximately % in. for 1 in. yellow pine flooring. Thickness of fill assumed 2 in. dThe coefficient used for cellular gypsum, 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. 52 Chapter 2--Heat Losses from Buildings Table 30. Coefficients of Transmission (U) of Concrete Construction Floors and Ceilings v ..__These coefficients are expressed in B.t.u. per hour per square foot per 1 dec. fahr. nrFRRENCE IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARE BASED ON STILL-AIR (NO WIND) DlFF?__.^xrc nN BOTH SIDES. TV. values of U in BusTable are basedontbefollowmi) Infernal Conductivities or Conductances which are " ^ * iCS> !- r Flooring SaMSS-w Is g: Plaster (Gypsum} Rqid Insulation (Boardforoi) 2% 0.33 perT Ceilm^T^^S^^^TConcrete Type of Ceilmcj L J tS z: i. MeFfoerw<i * JnaucuV (Concrete bare) A' 1 Ho Ceilmcf 2 3 4 4" 6" 8`` AO" 5 Plaster applied 6 directly to under-Side of Concrete 7 4" 6" R" 8 4 Suspended or 10 Furred Meta) Lath $ Plaster It Ceilinq 12 iou 4" 6" 8" TO" 13 Suspended or 14 Furred Ceilind of Plaster board 15 4 Plaster \(n 4" 8" \o' 17 Suspended, or in Furred Ceiling or {Rqid Insulation 19 (Board form) l ' ?o plaster 4" 6" ft" 10" 71 fPlaster on 1(" 77 Cork board set in Cement Mortar 23 on Concrete 74 4" (o' R" \cf 75 74 Cork board set in 77 Cement Mortar on Concrete ` 28 4" C 8" Iff 0-508 0.452 0.408 O- 372 0457 0.411 0.374 0-344 0-312 0.244 0.272 0.255 0.247 0-277 0.260 0.245 0.217 0.206 0.147 0.187 0.138 0.133 0124 0.125 0.112 0-104 0.106 0.104 Type of Flooring l*Yellow finefloor-tnq on Wood Sleepers TMaple orOak fleonnq n fYellowfine Sub- fTerreijoor Tile Hoorroqon embedded m rloonnq on Woodkeepers Concrete Concrete embedded in Concrete B Q.364 0.334 0.310 0.288. 0.337 0.311 0.240 0. 271 0.251 0.237 0.224 0.212 0.241 0.228 0.216 0.206 0 185 0.178 0.170 0.163 0.124 0.121 0.117 0.114 0.103 0.101 0.048 0.046 c 0.242 0.273 0.256 0.241 0.275 0.258 0.243 0.230 0.215 0.204 0.145 0.186 0.208 0.148 0.184 0.181 0.165 0.154 0.153 0.147 0.115 0.112 0.104 0.106 0.047 0.044 0.042 0.040 D 0.483 0.433 0.342 O. 358 0. 437 0. 345 0 361 0. 332 0.303 0. 282 0264 0.244 0 284 a 270 0.254 0.234 0.212 0.202 ~0. 143 0.184 'O. V$(o 0.132 0.128 0.124 O.llt 0.108 0.105' 0.103 aThe figures in column "1A " are sufficiently accurate for concrete floors covered with carpet or linoleum. bThe figures in column -B." are sufficiently accurate for l\& in. maple or oak flooring applied directly over the concrete on wood sleepers. 53