Document jmYrrLBwBnDx5zpv1ojeb6p12

Plain Walls--no Interior Finish I Plaster (fa in.) on Walla Metal Lath and Plaster*--Furred Insulating Board (fa in.) Plain or Decorated--Furred Insulating Board Lath (fa in.) Plastered/--Furred Insulating Board Lath (1 in.) Plastered/--Furred . Gypsum Lath Plastered/ Plus 1 in. Blanket Insulation--Furred Wall N umber . HEATINC VENTILATING AIR CONDITIONING GUIDE 1944 Table 7. Coefficients of Transmission (/) of Brick and Stone Veneer Masonry Walls 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 a wind velocity of 15 mph. TYPICAL CONSTRUCTION FACING BACKING INTERIOR FINISH (Plus Insulation Where Indicated) S 1 1 Q 5s 'a E id 5 iCoQ M 3 si y sb o 1 #i A B CDE FGH i 6 in. Hnllnw Tils* 8 in. Hollow Tilei...-.............. ............. 0.35 034 035 035 034 0.19 0.18 0.14 0.13 0.34 0.32 035 0.24 0.23 0.19 0.18 0.14 0.13 88 89 4 in. Brick Veneer4 Bin. Concrete.... A In PjinprotA 0.59 034 035 035 0.33 034 033 0.17 0.15 90 0.54 030 033 033 031 033 0.23 0.17 0.15 91 8 in. Concrete Blocks* (Gravel Aggregate)....................... 0.44 0.41 0.29 0.29 0.2& 031 031 0.16 0.14 92 8 in. Concrete Blocks*. (Cinder Aggregate).... ......... ........ 8 in. Concrete Blocks* 0.34 033 0.25 0.24 034 0.19 0.18 0.14 0.13 93' (Light Weight Aggregate)*.......... 0.31 0.29 033 033 0.22 0.18 0.17 0.14 0.12 94 6 in. Hollow Tilt* . ..... 0.37 035 036 0.26 035 0.19 0.19 0.15 0.13 95 Bin. Hollow Tile*................ ................ 0.36 034 035 035 034 0.19 0.19 0.15 0.13 96 4 In. Cut Stone Veneer* / 6 in. Concrete...... --__ ______;_____ 0.63 038 037 036 0.34 0.25 0.24 0.18 0.15 97 8 in. Concrete....................................... 0.57 033 035 034 033 0.24 0.23 0.17 0.15 98 8 in. Concrete Blocks* (Gravel Aggregate)...................... 0.47 0.44 030 030 0.29 0.22 031 0.16 0.14 99 8 in. Concrete Blocks* (Cinder Aggregate)......... ............. 036 034 035 0.25 0.24 0.19 0.19 0.15 0.13 100 8 la Concrete Blocks* (Light Weight Aggregate)*.......... 032 030 0.23 0.23 0.22 0.18 0.18 0.14 0.12 101 Calculations based on fa in. cement mortar between backing and facing ercept in the case of the concrete backing which is assumed to be poured,in place. `The hollow tile figures are based on two air cells in the direction of heat flow. `Hollow concrete blocks. ^Expanded slag, burned clay or pumice. - `Thickness of plaster assumed fa- in. /Thickness of plaster assumed fa in. : , `Based on 2 in. furring strips; one air space. The figures-in-this column may>also be used for wood or metal lath. 106 CHAPTER 4. HEAT TRANSMISSION COEFFICIENTS Table 8. Coefficients of Transmission (U) of Frame Partitions or Interior Walls4 Coefficients are 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 still air (no wind) conditions on both sides. INTERIOR FINISH SINGLE PARTITION (Finish on one side only of studs) DOUBLE PARTITION (Finish on both sides of studs) No INSULATION BETWEEN STUDS 1 in. Blanket BETWEEN STUDS. One axb space. Metal Lath and Piaster1...... ........ Gypsum Board (fa hr) Decorated. Wood Lath and Waster..-............. Gypsum Lath (fa in*) Plastered*. Plywood (fa In.) Plain or Decorated.............. Insulating Board (fa in.) Wain or Decorated. Insulating Board Lath (fa in.) Plastered*...... Insulating Board Lath (1 in.) Plastered*....... A 0.69 0.67 0.62 0.61 0.59 0.36 0.35 0.19 B 0.39 0.37 0.34 0.34 0.33 0.19 0.18 0.12 C 0.16 0.16 0.15 0.15 0.15 0.11 0.11 0.082 1 2 3 4 5 6 7 8 Coefficients not weighted; effect of studding neglected. `Plaster assumed fa in. thick. `Plaster assumed fa in. thick _ .. ,, . . _, _ , . rfPor partitions with other insulations between studs refer to Table 5. using values in Column B of above table in left hand column of Table 5. Example: What is the coefficient of transmission (/) of a partition consisting of gypsum lath and plaster on both sides of studs with 2 in. blanket between studs? Solution: According to above table, this partition with no insulation between studs (No. 4B) has a coefficient of 0.34. Referring to Table 5. it will be found that a wall having a coefficient of 0.34 with no insulation between studs, will have a coefficient of 0.097 with 2 in. of blanket insulation between studs (No. 56B). Table 9. Coefficients of Transmission (U) of Masonry Partitions 2 in. solid placer partition, U = 0.53. `Expanded slag, burned clay or pumice. the A.S.H.V.E. Research Laboratory8 indicate that the rate of heat flow through basement floors, even without insulation, does not exceed 0.10 Btu per square foot per degree Fahrenheit temperature difference between the air above the floor and the soil under the floor at the point of maximum A.S.H.V.E. Research Report No. 1213--Heat Loss Through Basement Walls and Floors, by F. C. Honghten. S. I. Taimuty, Carl Gotberlet and C. J. Brown (A.S.H.V.E. Transactiohs, Vol. 48, 1942. p. 369). ' - - 107