Document 2RVJ4y7YpLL74jd8REKVK45NN

192 CHAPTER 9 1953 Guide ||p Table 13. Coefficients of Transmission (U) of Concrete Construction Floors and Ceilings Coefficients are expreseed in Btu per {hour) {square:foot) (Fahrenheit decree difference in temperature between the air on the two rvdw), and are hosed on stfU air (no wind) conditions on both sides. 1' 'w' TYPE OP CEILING Type op Floo RING Thickness op Concrete (Inches) -No Flooring (Concrete Bare) Tile or Tenezzo Flooring on .^Concrete M In. Asphalt Tile. Directly, on Concrete Parquett Flooring in Mastic on Concrete Double Wood Floor on Sleepers a 6. % A B C D. E No Ceiling.............................................. H in. Plaster Applied to Underside of Concrete..:.......................................... Metal Lath and Plaster*--Suspended or Furred............................................. Gypsum Board (% in.) and Plaster^-- Suspended or Furred........................ Insulating Board Lath (H in.) and Plaster-'--Suspended or Furred___ 3 6 10 3 6 10 3 6 10 3 6 10 3 6 10 0.68 0.59 0.50 0.62 0.54 0.46 0.38 0.35 0.32 0.36 0.33 0.30 0.25 0.23 ' 0.22 0.65 0.56 0.48 0.66 0.68 0.49 0.45 0.41 0.36 . 0.59 0.52 0.44 0.60 0.53 0.45 0.43 0.39 . 0.34 0.37 . 0.37 0.34 " 0.35 0.31 0.32 0.30 0.28 0.26 0.35 0.32 0.29. 0.35 0.33 0.30 0.28 0.27 , 0.24 0.24 0.23 0.21 0.25 0.23 0.22 , 0.21 0.20 0.19 0.25 0.23 0.22 1 2 3 0.24 0.22 . 0.21 :' 0.19 0.18 0.17 4 5 6 7 8 9 0:19 0.18 0.17 10 U 12 0.15 . 13 0.15 14 0.14 15 0 Thickness of tile assumed to be 1 in. * Conductivity of asphalt tile assumed to be 3.1. * Thickness of wood assumed to be }J in.; thickness of mastic, l in. (t " 4.5). Col. D may also be used for concrete covered with carpet. ^ Based on 3} 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 3 in. ? Thickness of plaster assumed to be i in. 0 For other thickness of concrete, interpolate. 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 panel 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 14.Table Coefficients of Transmission ([/) of Concrete Basement Floors on Ground with .Various Types of Finish Flooring U -- 0.10" Btu per (hr) (sq ft) (Fahrenheit degree temperature difference between the ground and the air over the floor). (See text p. 185.) rt 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 12. For further data see A:S.H.V.E. Research Report No. 1213--Heat Loss Through Base ment Walls and Floors, by F. C. Houghten, S'. I. T&imuty, Carl Gutberlet and C. J. Brown (A.S.H.V.E. Transactions, Vol. 48, 1942, p. 369). H*at Transmission Coefficients bf>Buildin&Materials 193 Table 15. Coefficients of Transmission (U) of Flat Roofs Covered with' Built-uf-Roofing. No Oeiung---Under Side of Roof Exposed (See-Table 16 for Flat Roofs with'Ceilings) "1 ''These coefficients are expressed in'Btu per {hour} (square foot) (Fahrenheit degree difference n temperature between the avr on the two sided),-arid are based on an outside wind velocity of 15 mph. Ttpb op Roof Deck Insulation on Top op Deck . (Covbbed with Built-Up Rooting) Thick ness op Roop No In sola tion * Insulating Board (Thickness Below) Deck (Inches) 4 In. 1 In. 13 In. 2 In. D. COBKBOABD Num (Thickness Below) DEB 1 In. 13 In. 2 In. H Flat Metal Roof Deck iwrowTtrti/ 0.24 0.18 .0:17 0.13 Precast Cement Tile xwriHe^/JjvA If in. 0.84 0.37 0.24 0.17 0.14 0.13 0.13 Concrete Jft/ULAtlON/ MasBflinnnm* <6attty 2 in. 4 in. 8 in. 0.82 0.72 0.65 0.36 0.34 0.24 0.23 0.22 0.17 0.17 0.16 0.14 0.13 0.13 0.22 0.21 0.21 0.16 0.16 0.15 0.13 0.12 0.12 Gypsum Fiber Concrete* on 3 in. Gypsum Board lNjIuULLjcrfrltOontt/ f **y etpjvAtob).p' 23 in. 33 in. 0.38 0.24 0.18 0.31 0.21 0.16 0.14 0.13 0.12 0.11 0.17 0.15 0.13 0.12 0.11 0.10 Wood IN/UlAUcS/ YOOFLNfe / mops 1 in. 13 in. 2 in. 3 in. 0.49 0.37 0.32 0.23 0.28 0.24 0.22 0.17 0.20 0.17 0.16 0.14 0.15 0.14 0.13 0.11 0.12 0.11 0.11 0.096 0.19 0.17 0.16 0.13 0.14 0.13 0.12 0.11 0.13 0.11 0.10 0:091 9. 10 II Coefficient of transmission of bare corrugated iron (no roofing) ia 1.50 Btu per (hr) (sq ft of projected nrea) (F deg difference in temperature) based on an outnde wind velocity of 15 mph. * 873 percent gypsum. 123 percent wood fiber. Thickness indicated includes 3 in. gypsum board* * Nominal thicknesses specified--actual thicknesses used in calculations.