Document Y95X7MXVmRqrqVyEqB1KBpERn

strips (one air space) in.) between fumng American Society of Heating and Ventilating Engineers Guide, 1935 Table 3. Coefficients of Transmission (U) of Masonry Wallso Coefficients ore expressed in Blu 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 16 mph. J TVPTf* A i CONSTRUCTION TYPE OF WALL 'tain walls--no interior finish | Plaster on wood lath--furred | Plaster in.) on metal lath--furred INTERIOR FINISH Insulated Walls Plaster (H in.) on rigid insulation (1 in.)--furred Decorated building board (H in.) without plaster--furred Q .2 a 1X J 3a !j T3 15 Ck 1 .3 a * c eo ao S's ll H |5c .s'-g 5 "T u 2> $.5 2 a Is2 j: a s!g BCD E F G H i J Plaster ( H in-) on metal lath attached to furring strips--furred space (over %-in. wide) faced one side with bright aluminum foil K. Plaster on metal tath attached to furring strips (2;` in.6)--rock wool fill U M in.6)' Plaster ( K in.) on metal lath attached to furring strips (2 in.6)--flexible L insulation Solid .Brick ' .f Based oh 4-in. face brick and the remainder common brick. 0.50 0.30 0.28 0.46 0.34 0.27 0.30 0:24 0.20 0.32 0.25 0.21 0.30 0.23 0.24 0.19 Q.20^_ .0.17 .0.22 0.19 0.16 0.16 0.14 0.13 0.14 012 0.11 0.23 : 0.12 0.19 lO.ll : 0.17 ilp.io 0.20 0.17 0.15 Hollow Tile : Stucco Exterior Finish.. >Tbe 8-in. and 10-in. tile figures are based on ! two cells in the direction of flow of heat.; The ; 12-in, tile is based on three cells in the ^irec:tion of flow of heat. The 16-in. tile consists. !of one 10-in. tile and one 6-in. tileeach having two cells in the direction of heat flow.. 8 10 12 16 Limestone or Sandstone 8. 12 16 24 0.40 0.39 0.30 0.25 0.37 0.37 0.29 0.24 0.19 0.27 0.27 0.22 0.19 0.26 0.26 0.22 0.19 0.20 0.20 0.17 0.15 0.20 0.19 0.17 0.15 - 0.15 0.15 0.13 0.12 0.13 0.13 0.12 0.11 0.20 . 0.20 0.17 0.15 6:11 ; 0.11 0.10 0.097 0.18 0.18 0.16 0.14 0.37 0.04 0.53 0.45 0.35 0.37 0.33 0.30 0.25 0.39 0.34 0.31 0.26 0.37 0.33 0.30 0.25. 0.26 0.24 0.22 0.20 0.25 0.23 0.22 0.19 0.18 0.17 0.16 0.15 0.15 0.14 0.14 0.13 0.26 0.24 0.22 0.20 o; i3 0.13 0.12 0.11 0.23 0.21 0.20 0.18 Concrete. These figures may be used with sufficient accuracy for concrete walls ..with stucco exterior finish. 10 16 20 0.79 0.G2 0.48 0.41 0.70 0.57 0.44 0.39 0.39 0.34 0.29 0.27 0.42 0.37 0.31 0.28 0.39 0.34 0.29 0.27 0.27 0.25 0.22 0.21 0.26 0.24 0.21 0.20 0.19 0.18 0.16 0.16 0.10 0.15 0.14 ,0.13 0.27 0.25 0.22 0.21 0.13 0.13 0:12 : 0.12 0.23 0.22^ . 0.20 ': 0.18 Hollow Cinder Blocks Based on one air cell in direction of heat flow. Hollow Concrete Blocks Based on one air cell in direction of heat flow. "Computed from factors marked by * in Table 2. 6Based on the actual thickness of 2-in. furring strips. 100 8 12 8 12 0.42 0.37 0.56 0.49 0.39 0.35 0.52 0.46 0.27 0.25 0.32 0.30 0.28 0.26 0.34 0.32 0.27 0.25 0.32 0.30 0.21 0.19 0.24 0.23 0.20 0.19 0.23 0.22 0.16 0.15 0.17 0.16 0.13 0.13 0.14 0.14 0/.21 0.19 6.12 . 0.19 0.11 .0.17 0.24 0.12 0.21 0.23 0.12 0J2O -- V. *A waterproof membrane should be provided, between the outer material and'.the ihsuiatiorr.fill to prevent possible wetting by absorption and a subsequent lowering of efficiency. . 101