Document zvpQMO6q5vov2oGLnLybpKR6

194 CHAPTER 9 1951 Guide Table 9. Coefficients of Transmission (V) or Brick and Stone Veneer Masonry Walls Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two rides), and are based on an outside wind velocity of IS mph. INTERIOR FINISH (Plus Insulation Wbehb Indicates) TYPICAL CONSTRUCTION FACING BACKING 3 1 .3. sT 3; 6tn. HallowTile*_ SlaHoQowTBe*-. I 035 4 In. Brick Veneer* 6In. Concrete-. 8 to. Concrete Blocks* 61a Hollow 8iaHeBowTDeM 028 0M 022 037 025 4 In. Cut l Veneer* 6 to. Concrete.- 8 In. Concrete Blocks* (Grave! Ago 8 ta Concrete Bio 'Cinder A 8 In. Concrete Bfe (light WeightAggregate)*-- 032 030 89 100 101 , 8 Calculations based on i in', cement mortar between backing and facing, except in the *>- of the con crete backing which is assumed to be poured in place. 6 The hollow tile figures are based on two air cedis in the direction of heat flow. * Hollow concrete blocks. * Expanded slag, burned day or pumice. 4 Thickness of plaster assumed | In. - 5 Thickness of plaster, assumed } in. 9 Based on 2 in. furring strips; one air space. Heat Transmission Coefficients of Building Materials 195 Table 10. Coefficients of Transmission (17) of Frame Partitions or AA Interior Walls8 / ****** are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between Coefficients an ^^ anj ^ based on still axr (no wtnd) conditions on both sides. Metal Lath and Hast*------- -- Gypsum Board (H in.) Decorated... WWOoOoOd Lath iaunmd *Plaste..r..-........... l--1 Gypsum Lath (H In.) Plastered*. Plvwood (H h>-) PIdn or Decorated.-----------Insulating Board (M m.) Plain or Decorated.Insulating Board Lath ()4 In.) Plastered*------ . T.____I T -IL |1 .. \ 1 "In nf.rfinl SINGLE PARTITION (Finish on one tide only of studs) DOUBLE PARTITION (Finish on both tides of studs) No tXSULATlOR BETWEEN STUDS It*. Blanket* BETWEEN STUDS. One air space. AB C 0.69 039 036 0.67 037 0.16 0.62 034 035 0.61 034 035 0.69 033 035 ' 0.36 039 031 0.35 0.18 031 0.23 032 0j082 a 2 Sos c2 1 2 3 4 5 8 7 8 Coefficients not weighted; effect of studding neglected. * Plaster assumed I in. thick. Plaster' assumed I in. thick. d por partitions with other insulations between studs refer to Table 7, using values in Column B of above table in left-hand column of Table 7. Example: What is the coefficient of transmission (IT) 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 7, it will be found that a wall having a coefficient of 0.34 with no insulation between studs, will have a coefficient of 0.10 with 2 in. of blanket insulation between studs (No. 56B). Table 11. Coefficients of Transmission. (U) of Masonry Partitions Coefficients are expreseed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on still air (no trind) conditions on both sides. 8 2 in. solid plaster partition, U " 0.53. * Expanded slag, burned clay or pumioe.