Document jB4dxydRBwOxnGjLjQVjxnov5

132 CH4PTER 6 . ~ 1948 Guide Table 14. Coefficients of Transmission (U) of Flat Roofs Covered with Builtup Roofing. No Ceiling---Under Side of Roof Exposed (See Table ,15 for Flat Roofs with Ceilings^--.. Thue {hour) (rguore/oo/) (Fahrenheit degree difference in iempercture between the air on the two sides), and are based on an outside wind velocity of 16 mph. Heat Transmission. Coefficients of Building Materials 133 87J4 per cent gypsum. 12M per cent wood fiber. Thickness indicated includes M in. gypsum board. 'Nominal thicknesses specified--actual thicknesses used in calculations.