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American Society of Heating and Ventilating Engineers Guide, 1928 Table 9-A. Coefficients of Transmission (77) of Various Types of Floors and Ceiling 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 still air (no wind) conditions on both sides. F&AM& COVJSTauCTlOkS The values U m this' Table are based on the /oKowmq Internal Conductivities CC) which are pressed in b.t.u. per Ur. per Sq .rt. per Vf Wood (Yellow Pme or fir) Planter (Gypsum) Wood Lath { Planter Planter board Cork board LOO per l* L31 f*r l* 2.00 as applied 3.04 per l* 0.30 per l* fiber Insulation (6oard/hm) felt or Quilt Insulation (5qft) Cellular Gypsum (10*) a 33 0.27 asq per f Per r per l* Powdered Gypsum (26*) 0.51 Y Wood ( Maple) 1.10 per Y tcr O 81 L. 3 Type of Ceilmq Insulation between Joists a er oJ. s k- Typteal Const ruetion floorinq : Cehn<) 7 Type floorinq - I'Yeilow Pme* I'Yeilow Pine* % Maple or Oak floorinq floorinq on Vi* floonnqon on Joists fiber Insulation I'yellow Pine (board form) Sub floorinq on Joists on Joists b Cd 165 Oo Ceilmq Uone 0l440 0.264 0.339 Uetal lath. 166 < Plaster (y4) Uone 0.551 Wood Lath 167 4 Plaster (Vt) Uone 0.50Z H* Plaster board 168 4 Plaster (yz`) Uone 0.546 168 Yl fiber Insulation _ ^ (board /arm) ( PlasterO/O Uone 0.310 ' no Wood Lath, 4 Plaster C'A) Yi Felt or Quilt * Insulation (5qft) 0.187 . Wood Lath 171 4 Plaster 0) Wood Lath 172 4 Plaster (Jfi) Fiber iosalahoff (board /brn) o.zoo Cellular Cvpsunt* N 0.123 fill Wood Lath 173 4 Plaster ('AO fbwdneA Gypsum* Fill 0.112 11fi. Cork board 178 4 Plaster (MO 175 Z' 4 CPolarsktbeora(rydOv Uone Uone 0. wq o.i 19 GZ45 O.Z34 O.Z44 ,0.181 0.131 a 137 0.112 . 0.103 0. Ill o.cm 0.178 0.173 0.178 0.143 . 0.110 0.(14 0.086 0.088 0.085 0.082 O.ZIO 020Z o.zoq 0.16Z 0.121 # 0.126 0.103 0.096 0.103 0.088'" The value of U is the same if insulation is applied to underside of joists and lath and plaster ceiling, separated by furring strips. {Based on actual thickness of approximately H in. for l.in. yellow pine flooring. {Thickness of fill assumed 3% in., based on 2 in. by 4 in. joists. 36 Chapter I--Calculating the Heat Losses from Buildings Table 9-B. Coefficients of Transmission {U) of Various Types of Floors and Ceiling __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. CoUCG-ETE COV1-5TG.UCTIOU The valuer of 0 iff this TaWe are based on the /bllowma Internal Conductivities CC) which are expressed, `in b.t.u. per Ur. per Sq.ft, per TP Tile or Terrazzo . KXOO Concrete (stone 1:2:4 mi*.) &.30 Cement Mortar 6.00 Wood-CYellow Pieeorfir) 1.00 Planter board 3.04 Planter '(Gypsum) 1-lZ Cork, board. . 0.30 fiber- Insulation (board/brr?i) 0.33 Wood ( Maple) LZO per t* per ^ per l. per l- per l. per l^ per.l^ perl per l Typical Construction - Flooring Type . of kO CeiUnq _D e s 2' k0o - Ik. 1761 iio Ceilmq 177 178 m .180 M2" Plaster applied 181 directly to underside 182 . df Concrete *183 184 Suspended r/urred' 185 Uetal Lath 4 Plaster 185 Ccilinq 187 188 Suspended 'or /iirred 184 Cejinq of %* PlasterWO board 4 Plaster 181 192 Suspended or/urred m Ceilmq o/ Me`fiber 184 185 Insulation (feoard/bnn) 4 Plaster m VA* Plaster on 187 IVt* Cork board Set in m Ml Cement Uortar on Concrete'' m 200 Ml Plaster on Z01 2" Cork board Set m 202 Ml Cement Uortar 203 on Concrete Type of 'Floorinq * f Yellow Pme 7 Maple or Oak T Terrd770 > Uo Floorinq floorinq on Floonnq on 1` or Tile _ccVu (Concrete bare) Wood Sleepers' Yellow Pine Sub- floorinq embedded in Floorinq on Vdsod on Concrete' Concrete' Sleepers embedded m Concrete _E h* a ,b c d 4' 0. 508 6' 0.452 8' 0.408 0.364 0. 334 0. 310 0.292 0.273 0.256 0.483 0.433 0.392 to* 0. 372 4' 0.457 0.288 0. 337 0.24 1 0.275 0.3 58 0.437 6' 0.411 8" 0.374 10* 0.344 0.311 0.280 0-271 0.258 0.243 0. 2 30 0.395 0. 361 0. 332 4' 0. 264 (o 0.248 8" 0.Z34 0.218 a 208 0.19 8 ` 0. 191 0. 183 0.175 0.258 0.242 0.229 10" 0.222 0.188 0.168 0.217 4* 0.263 0.218 0. 190 0.256 6' 0.247 0.207 0.182 0. 241 8' 0-Z34 0.(88 0:174 0. 228 io' 0.221 0.188 0.167 0. 216 4' 0.183 0.167 O. 1-5*1 r 0.189 6' 0.184 ft* 0.176 10* 0.168 0.161 0.155 0.149 0.145 . ^ 0.140 . 0.136 . 0.181 0.173 0.166 4* 0.738 6' 0.133 & cmq 10' ai25 0.124 0.121 0.117 0.tl4. . 0. 115 0.112 0.109 0.106 . 0.136 0.132. . 0.128 0.124 ` 4* 0.112 6' o.ioq 8* . 0.106 0.103 0.101 0.088 0.097 0.094 0.092' 0. HI 0.108 0.105 . 10' 0.104 0.086 0.090 0.103 The figures in column "a" are sufficiently accurate for concrete floors covered with carpet or linoleum. tThe.figures in column "b'Vare sufficiently accurate for % in. maple or oak flooring applied directly over the concrete on wood sleepers. '0 37