Document e1zRMnBKeqaz24aKKVj8qJM89

HEATING VENTILATING AIR CONDITIONING GUIDE 1940 Table XI. Coefficients of Transmission (E/) of Various Types of Flat Roofs Covered with Built-Up Roofing* TYPICAL CONSTRUCTION Without Chungs With Metal Lath and Plaster Csiungs* TYPE OF ROOF DECK Roof Dec* (Inchbs) No. /HIT XQSflHGj /Tu-t `Vuppoftr/-^ irwut.ATl.0N) TLttQEdNdi I cohciltc.^ HortN<p /fi* *T/UrfOT!.T/X* Precast Cement Tile 1H W/OLATIUN/ ROOFlNOj______ / Concrete Concrete Concrete in/l/uUiLfCKtUioonr/ tOOHHC> Wop/ ROOHFINtlGf*/t CUUH67 Wood Wood Wood Wood 1^ IF 4` iNIUL/fflOft/ RJgpirt 62 / vlkSTVL WX9' irl/iiLAtion/ H0<>F1rt_Ci_ Gypsum Fiber Concrete* (2 in.) on Plasterboard (H in.) Gypsum Fiber Concrete* (3 in.) on Plasterboard (H in.) Gypsum Fiber Concrete* (2 in.) on Rigid Insula- lation Board (H in.) Gypsum Fiber Concrete* (2 in.) on Rigid Insula tion Board (I in.) IrijOUTlPlt/ RPOFIKCa /. iiimnililHillima CEIUHd 7 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.______ "Computed from factors marked by * in Table 2. . `Nominal thicknesses specified--actual thicknesses used in calculations. Gypsum fiber concrete--87H Per cent gypsum. 12H per cent wood fiber. 2H 3H 2M 3 110 CHAPTER 5. HEAT TRANSMISSION COEFFICIENTS AND TABLES Coefficients ore 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 15 mph. WITHOUT CEILING--UNDER SIDE OF ROOF EXPOSED WITH METAL LATH AND PLASTER CEILINGS* d 5 ja d 5 _d M d | J 1 | 1 1_ag 3 ao 9 a oa _ao 9 a dX T2 d N ; 0 ' 9 9 o -a 3 9 3 ho O o O a o O .55 Rigid Insulation (H In.) d _o _d 5 M d 1;sao 9 30a3 3 0O 3 9 J3 i aaa s tt9 *3 9 *3 "9 '3 JA O' 3 O0 ABCD E F G H I J K LMN0 i.9 c* 1 0 0 p 0.84 0.37 0.24 0.18 0.14 0.22 0.16 0.13 0.43 0,26 0.19 0.15 0.12 0.18 0.14 0.11 0.82 0.37 0,24 0.17 0.14 0.22 0.16 0.13 0.42 0.26 0.19 0.15 0.12 0.18 0.14 0.72 0.34 0.23 0.17 0.13 0.21 0.16 0.12 0.40 0.25 0.18 0.14 0.12 0.17 0.13 0.84 0.33 0.22 0.16 0.13 0.21 0.15 0.12 0.37 0.24 0.18 0.14 0.11 0.17 0.13 0.11 0.11 0.11 0.49 0.28 0.20 0.15 0.12 0.19 6.14 0.12 0.32 0.21 0.16 0.13 0.11 0.15 0.12 OtlO 0.37 0.24 0.18 0.14 0.11 0.17 0.13 0.11 0.26 0.19 0.15 0.12 0.10 0.14 0.11 0.095 0.82 0.22 0.16 0.13 0.11 0.16 0.12 0.10 0.24 0.17 0.14 0.11 0.097 0.13 0.11 0.092 0.23 0.17 0.14 0.11 0.096 0.13 0,11 0.091 0.18 0.14 0.12 0.10 0.087 0.11 0.096 0.082 0.40 0.25 0.18 0.14 0.12 0.17 0.13 0.11 0.27 0.19 0.15 0.12 0.10 0.14 0.12 0:097 0.32 0.22 0.16 0.13 0.11 0.15 0.12 0.10 0.23 0.17 0.14 0.11 0.097 0.13 0.11 0:091 0.26 0.19 0.15 0.12 0.10 0.14 0.11 0.10 0.20 0.16 0.13 0.11 0.09 0.12 -0.10 0.087 0.19 0.15 0.12 0.10 0.09 0.12 0.10 0.08 0.16 0.13 0.11 0.09 0.08 0.10 0.09 0,077 0.95 0.39 0.25 0.18 0.14 0.23 0.17 0.13 0.46 0.27 0.19 0.15 0.12 0.18 0.14 0.11 *These coefficients may be used with sufficient accuracy for wood lath and plaster, or plasterboard and Plaster ceilings. It is assumed that there is an air space between the under aide of the roof deck and the upper side of the ceiling. Ill