Document dYXxNbqoLNBqZyZBz3Z3E4dxQ

American Society of Heating and Ventilating Engineers Guide, 1931 Table .26. Coefficients of Transmission (U) of Frame Construction Floors and Ceilings NoU.--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 STILL-AIR (NO WIND) CONDITIONS ON BOTH SIDES. The valuesof U inthis Table are baled on thefollowinc Internal Conductivities or Conductances which are expressed in B.t.u. per Hr. per Sq.Ft.per FF Wood (Yellow Pine or Fir) Wood (Maple') Planter (Gypsum) Plaster board 1.00 per 1* 1.20 per t" 2.32 per l" 3.73 per If Wood Lath 4 Plaster Cork board C.iqid Insulation (fcoardform) Cellular Gypsum (18*) Flaked Gypsum, Dry (18*) 2.00 asappliei 0.30 per r 0.33 per l" 0:51 per 1" 0.34 per 1" Flexible Insulation 0.27 per l' Typical Construction fToormq-^ Ceiling Type of rioormq Type ' Insulation f Mp JfloQnnq ' Willow Plrteb l "Yellow firra b. & MaptebtOak VL> or CetUnq between Joists -Mobrmq X Hocn-iTiq orl.4? floormqon l" oh-Joints** . kiqid. Insulation Yellow nne 5 {Bodni'fofrk) Sub-floonnq 3i on Jo-.stS on Joists A' cD 1 Ho Ceilinq None 0.440 0.264 0.338 z Metal Lath 4 Plaster (*) Wood Lath 3 4 Plaster (4") None None Pladerboard 4 4 Plaster () None 5 4-"iaid Insulation .(poardform) Slone * Plaster (V) Wood Lath t 6 : Plaster (-5") ^"Flexible a Insulation Wood Lath & Vftqid Insulation 7 Piaster (4`) (Board form) a 8 Wood Lath 4 Plaster (-Jf)' CellularGupsum nil (2") <*-*- 8 Wood Lath 4 Plaster () flaked.Gypsum nil m c 1? Cork board 10 4 Plaster (V) None. II 2" Cork board 4 Plaster (-i*) None 0.551 0.502 0.506 0.310 0.ZI0 o.m 0.186 0.127 o.Rq a iis 0.288 0.272 0.200 0.182 0.238 0.230 0.273 . 0.183 0.230 0.204 0.155 0.156 0.126 0.178 0.14-0 0.163 0.131 . 0.148 0.141 0.117 0.128 0.105 0.118 0.100 0.080 0.101 0.087 0.088 O.IIO 0.083 ' 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. cThickness of fill assumed 2 in. <*The coefficient used for cellular gypsum. 0.59 is for 18 lb. weight--weights as low as 12 lb. may be used. 62 Chapter 3--Heat Losses by Transmission Table 27. Coefficients of Transmission (U) of Concrete Construction iA * Floors and Ceilings --These coefficients are expressed in B.t.u. per hour per square foot per 1 deg. fahr. FBRBNCB IN TEMPERATURE BETWEEN THE AIR ON THE TWO SIDES AND ARE BASED ON STILL-AIR (NO WIND) CONDITIONS ON BOTH SIDES. The values of U in this Table are basedon thefellowmij Internal Conductivities or Conductances which are expressed in B.t.u.per Hr. per Sq.Ft.per l F Tie orTerraj^o . lOOO perl- Concrete (Stone l:2:4mix) 8.30 perl_ Cement Mortar 8 00 per l Wood (Yellow Pine or Fir) 1.00 per Wood (Maple) UO perl Plasterboard J-75 per| Plaster (Gypsum) 232 per |" Cork, board /Q . , Riqid Insulation (Boardton*) P^l" 0.33 perl Typical Construction floormq Ceiling Concrete Number 1 Type of Ceiling 1 Mo Ceilinq 2 3 4 5 ^ Plaster applied 6 directly founder-side of Concrete 7 8 9 Suspended or JO Purred Metal II Lath 4 Plaster Ceilinq 12 13 Suspended or* .14 Purred Ceilinq ofjr" Plaster board 15 4 rlastcr 16 17 Suspended or 18 Purred Ceilinq of Eiqid Insulation 18 ^Board form) 4 20 21 ^Plaster on if 22 Cork board set in 23 ^"Cement Mortar on Concrete 24 25 f Plasteron 2" 26 Cork board set in 27 28 on Concrete Xi No floormq * j>utc*>i (Concrete bare) 0 A' 4" 0.508 6" 0.452 a" 0.408 10" 0.372 4" 0.457 6" 0.4U 8' 0.374 io" 0344 4" 0.312 6" 0.299 3" 0.272 10" 0.255 4' 0.297 G" 0.277 8' 0.260 10" 0.245 4" 0.217 6" 0.206 8' 0.187 10" 0.187 4" 0.138 6" 0.133 8' 0.129 . 10" 0.125 4" 0.112 (d 0.109 &' 0.106 to1' 0.(04 Type of TToorinq 1*Yellow Pine Floar- H'Maple orOak. floonhc f Terraco or -<nqonWoodSleepers on fYellow Pine Sub- Tile Floormqon embedded m floonnq on WoodSleepers Concrete Concrete embediedin Concrete B 0.364 0.334 . 0,310 0.28& 0.337 0.311 0.290 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 0.098 0.096 c 0.282 0.273 0.256 0.241 0.275 O.Z5& 0.243 0.230 0.215 0.204 0.185 0.186 0. 208 0.188 0.189 0.181 0.165 0.(58 0.153 0.147 0.11 5 0.112 0.108 0.106 0.087 0.084 0.082 0.080 D 0.483 0.433 0.382 0.358 0.437 0.385 0.361 0.332 0. 303 0. 282 0 264 0.248 0.288 a 270 0.254 0.239 0.212 0.202 0. 183 .... 0.184 .0.136 0.132 0.128 . 0.124 O.lll 0.108 0.105 - 0;103 aThe figures in column "A" are sufficiently accurate for concrete floors covered with carpet or linoleum, figures in column " B" are sufficiently accurate for in. maple or oak flooring applied directly over the concrete on wood sleepers. '` - *