Document wDe9DRbyG5GzqGMEOae6MK5qQ

128. CHAPTER 6 1946 Guide Table 6. Coefficients of Transmission (U) of Frame Walls with Insulation Between Framing^ b Coefficients ore expressed in Btu per (.hour) (square foot) (Fahrenheit .degree difference in temperature between the air on the two sides), and are based on an outside wind velocity of 15 mpk. COEFFICIENT WITH NO INSULATION BETWEEN FRAMING COEFFICIENT WITH INSULATION BETWEEN FRAMING Mineral Wool ob Vegetable Fibers in Blanket or Bat Fork0 (Thickness below) 1 IN. 2 IN. 3 IN. 3% IN. Mineral Wool A B c D O.II 0.12 0.13 0.14 0.15 0.078 0.083 0.088 ' 0.092 0.097 0.063 0.067 0.070 0.072 0.075 0.054 0.056 0.058 0.061 0.062 0.051 0.053 0.055 0.057 0.059 33 34 35 36 37 0.16 ' 0.17 0.18 0.19 0.20 0.10 0.10 0.11 0.11 0.12 0.078 0.080 0.082 0.084 0.086 0.064 0.066 0.067 0.069 0.070 0.060 0.062 0.063 0.065 0.066 38 39 40 41 42 " 0.21 0.22 0.23 0.24 0.25 0.12 0.12 0.12 0.12 0.13 0.088 0.089 0.091 0.093 0.094 0.072 0.073 0.074 0.075 0.076 0.067 0.068 0.069 0.070 . -0.073 43 44 45 46 .47 0.20 0.13 0.27 0.14 0.28 . 0.14 0.29 0.14 0.30 0.14 0.096 0.097 0.098 0.10 0.10 0.077 0.078 0.079 0.080 0.080 ' 0.072 0.073 0.073 0.075 0.075 48 49 50 51 52 0.31 0.14 0.10 0.081 ^ 0.076 .53 0.32 0.15 0.33 0.15 0.10 0.10 , 0.082 0.083 ' 0.077 0.077 54 55 ' . ..0.34 0.15 0.10 0.083 0.078 56 0.35 0.15 0.11 0.084 0.078 57 0M 0.15 027 0.16. 0.38 0.16 0.39 0.16 0.40 0.16 0.11 0.085 0.079 58 0.11 0.085 0.080 59 0.11 \ 0.086 0.080 60 0.11 0.086 0.081 61 0.11 0.087- - 0.082 62 0.41 0.42 0.43 0.44 0.16 0.16 0.17 0.17 0.11 0.11 0.11 0.11 0.087 0.088 0.088 0.089 0.082 0.082 0.082 0.083 63 64 65 66 . This table may be used for determining the coefficients of transmission of frame constructions with the types and thicknesses of insulation indicated in Columns A to D inclusive between framing. Columns A, B and C may be used for walls, ceilings or roofs with only one air space between framing but are not. applicable to ceilings with no flooring above.- (See Table 11.) Column D is applicable to walls only. Example: Find the coefficient of transmission of a frame wall consisting of wood siding, in. insulating board sheathing, studs,(gypsum lath and plaster, with 2 in. blanket insulation between studs.' -According to Table 5. a^wall of this construction with no insulation between studs has a coefficient of 0.19 (Wall No. 4D). Referring to Column B above, it will be found that a wall of this value with 2 in. blanket insulation between the studs has a coefficient of 0.034; ... Coefficients corrected for 2x4 framing, 16 in. on centers--15 per cent of surface area. Based on one air space between framing. ' *No air space. . rr**it Transmission Coefficients of Building Materials 129 . Table 7. Coefficients of Transmission (U) of Masonry Walls Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on an outside wind velocity of 16 mph. Based on 4 in. hard brick and remainder common brick. The 8 in. and 10 in. tile figures are based on two cells in the direction of heat flow. The 12 in. tile is based on three cells in the direction of heat flow. -The 16 in. tile consists of one 10 in. and one 6 in. tile each having two cells in the direction of heat flow. Limestone or sandstone. *These figures may be used with sufficient accuracy for concrete walls with stucco exterior finish. Expanded slag, burned clay or pumice. ' /Thickness of plaster assumed % in. Thickness of plaster assumed in. Based on 2 in. furring strips; one air space.