Document 6bjY8oMNVYdmnx5m8L8NoM6M1

192 CHAPTER 9 1955 Guide) Table 16. Coefficients of Transmission (U) of Flat Roofs Covered with3 Built-up Roofing. With Lath and Plaster Ceilings"* ' '| (See Table 15 for Flat Roofs with No Ceilings) , l| These coefficients are exproceed in Bin per (hour) (square foot) (Fahrenheit degreedifference in temperature between the air cm the two sides), and are baaed an an outside wind velocity o] 16 mph. ----------------------------- - '' ,'sL* Insulation on Top of Deck (CoVEBBD WITH BuILT-Up ROOFING). Ttpe of Roof Deck Thick- No In| NESS of I sula- Roof TION , Decs (Inches) Inbulatinq Boabd (Thickness Below) tin. It In- COBKBOABD (Thickness Below) It In. 2 In. NUHBEfi M H Flat Metal Roof Deck injoutwrt/ nt 0.46 0.27 0.12 0.18 0.14 0.11 Precast Cement Tile ftflIFftftfr /fttt T!/yrroi.T/-A It in. 0.15 0.12 0.18 0.14 0.11 -t# . nvouYum. ,0.42 0.40 0.37 0.26 0.25 0.24 0.19 0.18 0.18 0.14 0.12 0.14. 0.12 0.14 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 0.27 . 0.19 0.23 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* UW(1laTiOT1> ROOFlftgj / 3BBEBJSB 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 * SCeaelcTualabtlieon5s, Nbaosteeda.on metal lath and plaster ceilings, but coefficients may be used with sufficient*^' curacy for gypsum lath or wood lath and plaster ceilings. It is assumed that there is an air space between-. the under side of * 87H percent the roof deck and the gypsum, 12>4 percent upper side of the ceiling. wood fiber. Thickness indicated includes Yi in. gypsum board- . * Nominal thicknesses specified--actual thicknesses used in calculations. f'*