Document rBDXvwd9mrmrKjzVYv0NX3d0E

192 CHAPTER 9 1952 Guide Tabu: 13. Coefficients of Transmission ([/) of Concrete Construction Floors and Ceilings Coefficient* are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the aiit on the two sides), and are based on stiU air (no wind) conditions on both sides. type of emmo TYPE ,OF FLOOBINO Thicknim OP . CoSCBBtP (Inches) No Hooting (Caserete Bare) . T3e*or Temno Flooring an Concrete Directly on Concrete Parquet* Flocnz^ Is Mastin' on Concrete Double Wood Floor cm Seepezs* j AB c D E 8 , 068 065 0.66 045 025 1 6 059 *056 oil 0.41 023 2 10 060 - 0.48 049 026 022 3 in* Raster Applied to Underside of 8 6 10 082 054. 040 059 022 044 060 053 045 3o 3e 3o 024 4 022 6 021 6 Metal lath and Plaster* Suspended or 8 0 10 0.38 027 037 020 * 019 7 0.85 024 035 028 018 8 .032 021 032 028 017 9 Gypsum Board 04 &) and Plaster/-- " 8 6 10 020 025 035 028 019 10 023 022 . . 033 027 018 11 080 029 030 024 017 12 InsojattngBeardloth 04bv)andPlaster/ 8 6 025 ' 023 024 023 025 : 021 ' 023 020 015 IS 015 14 022 021 022 0U9 014 18 Thickness of tile assumed to be 1 in. * Conductivity of asphalt tile assumed to be 3.1. * Thickness of wood assumed to Be in.; thickness of mastie, l in. (k 4.5). .Col. D may also be used for concrete covered with carpet; d Based on if in. yellow pine or fir sub-flooring and H in. hardwood finish flooring with an air space between sub-floor and concrete. * Thickness of plaster assumed to be f in. / Thickness of plaster assumed to be } in. 9 For other thickness of concrete, interpolate. Table 14. Coefficients of Transmission (U) of Concbete Basement Floors on Ground with Various Types of Finish Flooring U -- 0.10 Btu per (hr) (ea ft) (Fahrenheit degree temperature difference between the ground pnd the air over the floor). (See text p. 185.) * Since few data are available, a coefficient of 0.10 is frequently used for all types of basement concrete floors on the ground, with or without insulation. For basement wall below grade, use the same average coefficient (0.10). A lower ground temperature should, however, be used for walls than floors as explained in Chapter It. For further data see AJ3.H.V.E. Research Report No. 1213--Heat Loss Through Base* ment Walls and Floors, by F. C. Houghten, S. I. Taimuty, Carl Gutberiet and C, J. Brown (AJS.H.V.E. Transactions, Vol. 48, 1942, p. 369). perature of the room surfaces seen by the glass.. Special consideration should be given to those cases where the glass sees interior surfaces at temperatures differing greatly from the room air temperature, i.e.,. such cases as in sun rooms, greenhouses, and some pane} heated rooms, or where there is an unusual amount of air motion in the vicinity of the glass. Although based on zero outdoor air, the values change only slightly with different design temperatures, being about 5 percent greater for a 30 F outdoor design temperature. In computing the Table 20 values, consideration of the dependence of the indoor surface conductances upon temperature and direction of heat flow leads to surface conductances averaging about 1.50 for block and vertical glass, and about 1.80 for horizontal glass, as compared to the Heat Transmission Coefficients of 'Building `Materials 193 Table 15. Coefficients 'of Transmission (U)' of Flat Roofs Covered with Built-up Roofing; No Ceiling--Under Side of Roof Exposed (See Table 16 for 'Flat Roofs with Ceilings) Thai coefficient are expressed in Btu par {hour) (square foot) (Fahrenheit decree difference in temperature between the avronthe two eides), and are based on an outside wind velocity of IS mph. Type op Roop Deck Thick ness op Roof Deck . (Inches) No In sula tion Insulation on Top op Deck (Covered with Built-Up Rooting) '' Insulating Board ' (Thickness' Below) - CORKBOABD (Thickness Below) tin. 1 In. It In. 2 In. 1 In. It In. 2 In. Num ber BEH Flat Metal|Roof DeckJ' pODHKtM<3>/OUT"IM// 0.94 0.18 0.14 0.17 0.15 Precast Cement Tile fcooftNCj //Tuiirt 1| in. 0.84 0.17 0.16 Concrete injuuUtti UCOMHfij / coHtttre. 2 in. 4 in. 6 in. 0.82 0.73 0.36 0.34 0.24 0.23 0.17 0.17 0.14 0.13 0.22 0.21 0.16 0.16 0.13 0.12 0.65 0.33 0.22 0.16 0.13 0.31 0.15 0.12 Gypsum Fiber Concrete6 on t in. Gypsum Board 2iMJUt/ffK Rimric ram MAAD ' 't in. | in. 0.38 0.24 0.18 0.14 0.12 0.17 0.13 0.11 0.31 0.21 0.16 0.13 0.11 0.15 0.12 0.10 Wood* lN/UUOIflfl/ lOCftHfi / mmrnm w#op7 1 in. It in. 2 in. 0.49 0.37 0.32 0.28 0.24 0.23 0.20 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.11 0.19 0.17 0.16 0.14 0.13 0.12 0.12 0.11 0.10 3 in., 0.23 0.17 0.14 0.11 0.096 0.13 0.11 0.091 - transmission of bare corrugated iron (no roofing) ia IA0 Btu per (hr) (sq ft of projected Ta) (F deg difference in temperature) based on An outside wind velocity of 15 mph. 871 percent gypeum, lit percent wood fiber. Thickness indicated includes t in. gypsum board. * Nominal thicknesses specified--actual. thicknesses used in calculations.