Document rednG6gyYeKoakoQY5xZrLeM0

y> 138 CHAPTER 6 1949 Guide Heat Transmission Coefficients ofbuilding Materials 139 Table 14. Coefficients of. Transmission (U) of Flat Roofs Covered witr Built-up Roofing. No Ceiling--Under Side of Roof Exposed (See Table 15 for Flat Roofs with Ceilings) .. Table id- coefficients of Transmission (U) of Flat Roofs Covered with gU[LT_UP rOOFing. With Lath and Plaster Ceilings" (See Table 14 for Flat Roofs with No Ceilings) f Coefficients of transmission of bare corrugated iron (no roofing) is 1.50 Btu per (hour) (square foot of projected area) (Fahrenheit degree difference in temperature) based on an outside wind velocity of 15 mpb * 87} per cent gypsum, 12} per cent wood fiber. Thickness indicated includes } in. gypsum board. e. Nominal thicknesses specified--actual thicknesses used ip calculation^.