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Heating Ventilating Air Conditioning Guide 1938 Table 11. Coefficients of Transmission (17) of Various Types of Flat Roofs Covered with Built-Up Roofing typical construction Without Ceilings With Metal Lath AND Plaster Ceilings4 TYPE OF ROOF DECK Thickness or Root Deck (Inches) No. /tur KOOFlKCi /`hit spMs 'Vgppor.t/^' jrvuLAtiaNi cotiatTex /Cut ROOFINfi /TttL T/unoiX/jr* im CL1LI KG'' Precast'Cement Tile IK I caScRtTt'jipl Ct^UKj7 Concrete Concrete Concrete ,2.2 4- 3 `6 4 Wood Wood Wood Wood 5 6 7 4k 8 iNJOLjfflOtt/ RflOHrtej PLA JTR SOARP Ifl/ULATtfty EOOFlMCi. / hiiiu.u j Jinmirmy l&rJWK?. . PLA/TCfc M- ClLlH Gypsum Fiber Concrete0 (2 in.) on Plaster Board (K In-) Gypsum Fiber Concrete0 (3 in.) on Plaster Board IK in.) Gypsum Fiber Concrete0 (2 in.) on Rigid Insula* latlon Board (W in.) Gypsum Fiber Concrete0 (2 in.) on Rigid Insula tion Board (1 in.) Flat Metal Roofs Coefficient of transmis sion of bare corrugated iron (no roofing) is 1.50 Btu per hour per square foot of projected area per degree Fahrenheit dif ference in temperature, based on an outside wind velocity of 15 mph._____ X / ^Computed from factors marked by * ihrTable 2. - `Nominal thicknesses specified--actual thicknesses used in calculations. Gypsum fiber concrete---87M per cent gypsum. 12K per cent wood fiber. 2K m 2K 3 114 9 .1 11 '12 13 Chapter 5. Heat Transmission Coefficients and Tables Coefficients are expressed in Btu Per hour per square foot per degree Fahrenheit difference in temperature between the air on the two sides, and are based on an outside wind velocity of 16 mph. 115 1