Document gDGrpVGMmmL27X9LdzrBOVZjV

194 CHAPTER 9 1953; Guide; Table 16; Coefficients of Transmission (V) of Fiat Roofs Covered with Built-up Roofing. With Lath and Plaster Ceilings* (See Table 15 for Flat Roofs with No Ceilings) These coefficient* are expressed in Btu per . {how) {square foot) {Fahrenheit degree difference in temperature between the air on the two sides), ana are based an an outside wind velocity of tS mph. > Ttph or Roof Decs Flat Metal Roof Deck Thick ness OF Roof Deck (Inches) !No In- SULA- tion Insulation on Top of Deck (Covered with Built-Up Roofing) Insulating Board (Thickness Below) CoBKBOARD (Thickness Below) 4 In. U In. 2 In. I In. li In. 2 In. NUM BER H 0.27 0.15 0.12 0.14 Precast Cement Tile ,T ROOriNft /TlLt ^........ aiLIHA Concrete DWIATLotl RdOPlflSf / 1| in. 0.18 0.14 2 in. 4 in. 6 in. 0.42 0.40 0.37 0.26 0.25 0.24 0.19 0.14 0.18 0.14 0.18 . 0.14 0.12 0.12 0.11 0.18 0.17 0.17 0.14 0.13 0.13 0.11 0.11 0.11 Gypsum Fiber Concrete* on } in. Gypsum Board 2Ifl/ULitfUl QgFlHgj, Cirjyn;^ <sf,pjvry tskiLQ' 24 in. 34 in. 0.27 0.23 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.14 0.097 0.13 0.12 0.11 0.097 0.091 Wood* t/ULATlWl WOOFUtffj ' Hfa 1 in. 14 in. 2 in. 3 in. 0.31 0.26 0.24 0.18 0.21 0.19 0.17 0.14 0.16 0.15 0.14 0.12 0.13 0.12 0.11 0.10 0.11 0.10 0.097 0.087 0.15 0.14 0.13 0.11 0.12 0.11 0.11 0.095 0.10 0.095 0.092 0.082 11 * Calculations based on metal lath and plaster ceilings, but coefficients may be used with sufficient an* curacy for gypsum lath or wood lath and plaster oeilin. It is assumed that there is an air space between the under side of the roof deck and the upper side of the ceiling. * 874 percent gypsum, 124 percent wood fiber. Thickness indicated includes 4 in. gypsum board. * Nominal thicknesses specified--actual thicknesses used in calculations. Heat: Transmission Coefficients of Building Materials 19b T a b l e 17. C o e f f ic ie n t s o f T r a n s m is s io n ( U ) o f P it c h e d R o o f s Coefficients are expressed in B tu per (hour) (square foot) (Fahrenheit degree difference in tem perature hettceen the a ir on the tw o tid e s ), and are bated on a n outside w in d velocity o f 16 m ph. -u* >O% M. a sa I 1- - *o 5 ! -o s m4> 8 - m S, .2 $ *Ve ja 2 ~ tj a : e Oo --<** : B * ns ;1 -o *a2 a a ; (O * H L, S -3 I Pi J, :ii i 51 55