Document ba17eQE15XQLdZnvBQOM9oE30

118 CHAPTER 9 1959 Guide Table 15 .... Coefficients of Transmission (U) of Pitched Roofs*- b Coefficients n expressed io Btu per (hoar) (square foot} (Fuhreoheif degree difference in temperature befween (he air on (he h*o tides), and era on oa outside.wind velocity of 15 mph for heat flow upward end 7.5 apA for hoof (tow.downward fxaaph--Roof C Example of Substitution Resistances used are given below in this table or in Table 3 or 4 Construction Resistance {ft) (Heat Bow up) 1. Outside surface (15 mph wind)...................... 0.17 2. Slate shingles (X in-)...................................... 0 W 3. Building paper...................................................... 0.06 4. Wood sheathing (*Xt in-)................................ 0-98 5. Airspace*............................................................... 0.90 6. Gypsum lath (X in.).......................................... O.St 7. Plas. (sand agg.) (H io-).................................. 0.09 8. Inside surface (still air).................................... Q.6t Total resistance................................................... 3.19 V - UR - 1/6.19................ .......................... 0.31 See value 0.31 in'boldface type in table below. Resistances used are given below in this table or. in Table 3 or 4 Find U value for same construction with heat Sow down (summer conditions) Total resistance......................................................... 3.19 Deduct 1. Outside surface (15 mph wind)............................................ 0.17 5. Airspace.......................................... 0.90. 8. Inside surface (still air)..... 0.63 1.69 Difference.................................................................... Add 1. Outside surface (7.5 mph wind).. 0.36 5. Air space............................................. 0.89 8. Inside surface (still air)......... 0.70 1.60 Total resistance......................................................... 3.40 U = 1/R " 1/3.40........................................................... 0.29 To Adjust U Values for Construction with Added Insulation befween framing Member*, See Table 16 Direction of Heat How -- Upward How Winter Conditions Downward How Summer Conditions Softer Space Rafter Space Unventilated, Not to be Further Insulated Uiwenfdafed, No* to be Further ted Insulated ted Type of Ceding (Applied Oirectfy to Roof Soften ' Material Ratitfonce Asphalt = *U -T shingle* budding paper |S !l. I!?" 5*1 Jfs ]1| y s |! 5.? e -a 2TS 00 E Sv h- 5*s b * c -2 o-S-S eie 0O * 1^ 0.95 1.48 1.09 0.87 m ^s ~a n i"0 Asphalt _a = -a--r ' thing)n sodding paper 1 -- ssF 0 j :s W at 112 a> 0 _ Hi s* i.? stl* 5 I |J * 1! a * u 0A O O" < J 0.95 1.48 1.09 0.67 li 1? j* R u U U UuUU u Uu A8 c D FG H 1 i E Z Gypsum lath (H in-) & X in. plas. (lt.wt.agg.). Gypsum lath (% io.) and X in. plas. (sand )................................................................................ _ 0.33 0.64 0.41 0.57 0.34 0.30 0.33 0.44 0.29 0.26 0.28 Metal lath and X in. plas. flt. wt. agg.)........ 0.47 0.32 0.27 Metal lath and % in. plas. (sand agg.)............ 0.13 0.36 0.30 1.43 0.25 0.22 Insul. bd. lath and X in- plas. (sand agg.)... 1.63 0:24 0.21 0.53 0.32 0.29 0.60 0.35 0.31 0.66 0.54 0.46 0.51 0.30 0.28 0.40 0.26 0.24 0.31 0.34 0.52 0.29 0.25 0.31 0.34 0.33 0.50 0.29 0.25 0.37 0.61 0.32 0.27 0.24 0.25 0.34 0.23 0.20 0.23 0.25 0.33 0.22 0.20 0.48 0.29 0.27 0.53 0.31 0.28 0.56 0.47 0.41 0.28 0.30 0.28 0.31. 0.22 0.22 0.30 0.44 0.33 0.23 0.31 0.23 0.30 1 2 3 5 7. 8 (5i in.) on furring................................................ t.Sl 1.19 3.10 1.78 0.24 0.26 0.21 0.23 0.21 0.23 0.19 0.20 Wood lath and X in. plas. (sand agg.)............ 6.40 0.33 0.28 0.23 0.25 0.20 0.22 0.31 0.25 0.27 0.21 0.23 0.33 0-37 0.26 0.30 0.22 0.24 0.20 0.21 0.20 0.21 0.18 0.19 0.34 0.52 0.29 0.26 0.22 0.23 0.19 0.20 0.28 0.23 0.24 0.20 0.21 0.30 0.34 0.26 0.28 10 11 12 0.30 0.46 IS s See text aectmn *>i~n.t8wt Overall Coefficient* (or bams of calculations. k Pitch of roof--*5 deg. * To adjoat U value* tor the effect of added insolation between framing membera, aee Table 15. 4 When iiwuiatioa b iattalled between ratters, the apace above should be ventilated and in thb ease the roof construction b disregarded in mleufataoa of U valuo. To adjust U value* for pitched roof construction with added insulation between framing members, toe the average of value* for boruontal and vertical beat flow in Table 16A and either IOC or tOD depending on direction of heat flow. { Heat Transmission Coefficients of Building Materials 119 Table 16 .... Determination of U VatueResulHng from Addition of Insulation or Air Spaces to Uninsulated Building Sections* PART A. WAUS* U VcW> Without Added Insulation Fibrous Insolation* Thickness--(nebes X? 23 Oat Air Spoce'of Effective Eabtivrfy* E 0.82* 0.20 0.05 Two Air Spaces of Effective Eoiafvffyd Three Air Space* of Effective raiMmfyd E 0.82 0.20 0.05 0.82 0.20 0.05 Cot 1 23 4 5 6 7 8 9 10 II 12 13 14 0.70 0.60 0.45 0.40 0.304 0.284 0.246 0.230 0.194 0.1S6 0.168 0.161 0.113 0.110 0.104 0.101 0.080 0.078 0.075 0.074 0.7S2 0.630 0.460 0.409 0.463 0.412 0.331 0.299 0.380 0.341 0.280 0.258 0.437 0.392 0.318 0.291 0.240 0.225 0.195 0.185 0.189 0.177 0.158' 0.149- 0.298 0.276 0.237 0.222 0.250 0.144 0.130 0.125 0.112 0.108 0.098 0.095 0-35 0.30 0.28 0.26 0.212 0.192 0.184 0.175 0.152 0.142 0.138 0.133 0.097 0.093 0.091 0.089 0.072 0.069 0.068 0.066 0.354 0.30 0.28 0.26 0.267 0.234 0.221 0.208 0.234 0.207 0.196 0.185 0.282 0.232 0.220 0.207 0.172 0.158 0.151 0.144 0.140 0.130 0.125 0.120 ` 0.205 0.186 0.178 0.169 0.119 0.112 0.108 0.104 0.092 0.087 0.084 0.0S2 0.24 ` 0.22 0.20 0.18 0.166 0.156 0.145 0.134 0.127 0.121 0.115 0.108 0.087 0.084 0.081 0.078 0.065 0.064 0.062 0.060 0.24 0.22 0-20 0.18 0.194 0.180 0.165 0.150 0.173 0.161 0.149 0.137 0.194 0.180 0.166 0.152 0.137 0.129 0.120 0.112 0.115 0.110 0.104 0.098 0.160 0.150 0.140 0.129 0.100 0.096 0.091 0.086 0.079 0.076 0.073 0.069 0.16 . 0.14 0.12 0.10 0-08 0.123 0.111 0.098 0.085 0.070 0.100 0.092 0.083 0.073 0.062 0.074 0.069 0.064 0.058 0.050 0.057 0.054 0.051 0.047 0.042 0.16 0.14 0.12 0.10 0.08 ' 0.136 0.120 0.105 0.089 0.073 0.124 a. 111 0.098 0.084 0.068 0.137 0.122 0-107 0.091 0.074 0.103 0.094 0.084 0.074. 0.090 0.083 0.075 0.066 0.062 ' 0.056 0.118 0.106 0.094 0.082 0.068 0.080 0.075 0.068 0.061 0.053 0.065 0.061 0.056 0.051 0.045 * For constructions with air spaces aa mmdatioo, coefficients are baaed oa National Bureau of Standards data in Bousint Betearck Popcr No. 32 (U. S. Government Printing Office. Washington, D. C.). * Based on an indooroutdoor temperature difference of 70 F deg, aod a mean temperature of 50 F. Value* are appliable oooaervatively to winter and summer condi- b U value taken from Tables S to 15, baaed on oae nonreflective SH-in. air space betsreen framing member*. * Thermal conductivity of fibrous or bulk insolation taken aa 0.17 Btu per (hr) (aqft) (F deg per in.). ^ For values of effective tminivity E of air space, aee Table J, Section B. * Certain V values in Column 6 differ from Column 1 because they are adjusted to the specific temperature drop acroas the air space in question as affected by the V value of the construction. __________________ _______________ PART B. FLOORS'--HAT FLOW DOWN U Value* Without Added /mutation Fibrous Insulation* TJudcneo---Inches X1 2 3 One Air Space of Effective Cms*rrityi B 0.82 0.20 o.os Two Air Space* of Effective Emixsivifyl E Three Air Spaces of Effective Emistivity1 E 0.82 0.20 0.05 0.82 0.20 0.05 Col. 1 0.70 0.60 0.50 0,45 0.40 0.35 0.30 . 0.28 0.26 0.24 0.22 0.20 0.18 0.16 0.14 0.12 2 0.305 0.284 0.260 0.246 0.230 0.212 0.192 0.184 0.175 0.166 0.156 0.145 0.234 0.123 0.111 0.098 345 0.195 0.186 0.175 0.168 0.113 0.110 0.106 0.104 0.080 0.078 -0.076 0.075 0.161 0.152 . 0.142 0.138 0.101 0.097 0.093 0.091 0.074 0.072 0.069 0.068 0.133 0.127 0.121 0.115 0.089 0.087 0.084 0.081 0.066 0.065 0.064 0.062 0.108 0.100 0.092 0.083 0.078 0.074 0.069 0.064. 0.060 0.057 0.054 0.051 6 0.70 0.60 0.50 0.45 0.40 0.35 0.30 0.28 0.26 0.24 0.22 0.20 0.18 0.16 0.14 0.12 7 0.240 0.236 0.210 0.200 0.189 0.176 0.162 0.156 0.150 0.143 0.136 0.128 0.119 0.109 0.099 0.088 8 0.114 0.111 0.106 0.103 0.100 0.096 0.091 0.089 0.087 0.084 0.081 0.078 0.074 0.070 0.065 0.060 9 0.377 0.34$ 0.310 0.290 0.268 0.244 0.219 0.208 0.197 0.185 0.173 0.160 0.148 0.133 0.118 0.103 10 0.122 0.118 0.114 0.111 0.107 0.103 0.098 0.096 0.094 0.091 0.088 0.084 0.080 0.076 0.071 0.066 11 0.057 0.056 0.055 0.055 0.054 0.052 0.051 0-050 0.049 0.048 0.047 0.046 0.045 0.044 0.042 0.040 12 0.282 0.246 0.228 0.2J7 0.205 0.192 0.175 0.168 0.161 0.153 0.145 0.136 0.126 0.116 0.105 0.094 13 0.086 0.084 0.082 0.081 0.079 0.077 0.074 0.073 0.072 0.070 0.068 0.066 0.064 0.061 0.058 0.054 14 0.042 0.041 0.041 0.040 0.040 0.040 0.039 0.039 0.038 0.038 0.037 0.036 0.036 0.035 0.034 0.033 0.10 0.08 0.085 0.070 0.073 0.062 0.058 .0.047 0.050 0.042 0.10 0.08 0.076 0.063 0.054 0.047 0.089 0.072 0.058 0.050 0.037 0.033 0.081 0.068 0.049 0.044 0.031 0.028 * For ooostructioa with sirspeoes * insolation, coefficient? are baaed oa National Bureau of Standards data io Jfausbiy Rcetmk Paper No. 32 (U. S. Government ^Tinting Office, Washington, D. C.). * Based on a temperature difference of 50 F deg from air to air, and a mean temperature of 50 F. * V value taken from Tablet 11 and 12, in which it b assumed that the air space betsreen joists or above the suspended ceiling b nonroffeetive (E 0.S2), and b 8 in. thick. h Thermal conductivity of fibrous or bulk insulation taken a*0.27 Btu per (hr) (aqft) (F deg per in.). 1 For values of effective emisaivity E of air space, see Table 2, Section B. ii !I }11