Document rd2573ovXMYo0Le6vvB21EoG

186 CHAPTER 9 1957 Guide Table 6. Coefficients of Transmission (17) of Solid Masonry Walls* Coefficient* are expreseed tn Blu per (hoar) (square foot) (Fahrenheit decree difference in temperature between the air on the two sides), and are based on an outside wind velocity of 16 mph. T?v i wnt Tp F-r a uDI.r Citttema'n'rTnM I 2 3456* Resistance* used are given below in this table or tn Table S or 4. Construction Resistance (J2) 1. Outside surface (15 mph wind) 0.17 2. Face brick (4 in.).......................0.44 3. Common brick (4 in.)...............0.80 4. Air spaoeb.................................. 0.97 5. Gypsum lath 06 in.)................ 0.52 6. Plas. (sand agg.) 94 in............... 0.09 7. Inside surface (still air)......... 0.68 Resistances used are given below in this table or in Table 8 dr 4- . Assume plain wall--no fumng or Total resistance................ .. 8.47 Deduct 4. Airspace....... .. 0.97 5. Gypsum lath (H m.).. .. 0.52 6. pfks. (sand agg.) 94 tn. .. 0.09 Resistance deducted.... 1.88 Total resistance.......................8.47 V - l/R = 1/8.47 0.29 See value 0.29 in bold face type in table below. Total resistance............. 8.09 V l/R 83 1/9.09 -.. 0.48 To Adjust V Values for Construction with Added Insulation between Fur ring Strips, See Table 16. f Interior Finish Exterior Construction* P'LAS. % IN. on Wall Metal _,ATH AND H IN. Plas. on Fobbing Gypsum Lath ( H IN.) AND Vt IN. I>la8 on Fobbing I N8UL. Bn. Lath r ^ IN.) and L in.Plas. ON ]nF*oAoTHd AND li IN. p LAS. Furring a SB 0 z r' Resistance Material R V *0 ec si *3. w a*<*$ 1 a* oq 3 0a w" ZQ d 1Z 0 te a *< D au ww C*Q< 0.11 0.59 0.18 0.47 0.88 0.41 0.64 MS 1.68 0.40 UUU VU uVV VV Brick (face and common)*1 (6 in.) (8 in.) (12 in.) (16 in.) Brick (common only) (8 in.) (12 in.) (16 in.) Stone (lime and sand) (8 in.) (12 in.) (16 in.) (24 in.) Hollow clay tile (8 in.) (10 in.) (12 in.) Poured concrete 30 lb per eu ft (4 in.) (6 in.) (8 in.) (10 in.) 80 lb per cu ft (6 in.) (8 in.) (10 in.) (12 in.) 140 lb per cu ft (6 in.) (8 in.) (10 in.) (12 in.) 0.61 1.14 2.04 8.84 1.60 S.40 5.20 0.68 0.48 0.35 0.27 0.41 0.31 0.25 0.64 0.45 0.33 0.26 0.39 0.30 0.24 0.54 0.41 0.30 0.25 0.35 0.27 0.23 0.39 0.31 0.25 0.21 0.28 0.23 0.19 0.34 0.28 0.23 0.19 0.26 0.21 0.18 0.36 0.30 0.24 0.20 0.27 0.22 0.19 0.35 0.29 0.23 0.20 0.26 0.22 0.18 0.33 0.27 0.22 0.19 0.25 0.21 0.18 0.26 0.22 0.19 0.16 0.21 0.18 0.16 0.25 0.22 0.19 0.16 0.20 0.17 0.15 0.35 0.29 0.23' 0.20 0.26 0.23 0.18 0.64 0.96 1.88 1.98 0.67 0.55 0.47 0.36 0.63 0.52 0.45 0.35 0.53 0.45 0.40 0.32 0.39 0.34 0.31 0.26 0.34 0.31 0.28 0.24 0.36 0.32 0.29 0.25 0.35 0.31 0.28 0.24 0.32 0.29 0.27 0.23 0.26 0.24 0.22 0.19 0.2$ 0.23 0.22 0.19 0.35 0.31 0.29 0.24 1.86 8.88 8.60 4*44 6.66 8.88 11.10 0.36 0.33 0.30 0.19 0.13 0.10 0.08 0.36 0.31 0.29 0.19 0.13 0.10 0.08 0.32 0.20 0.27 0.18 0.13 0.10 0.08 0.26 0.24 0.22 0.16 0.12 0.09 0.08 0.24 0.22 0.21 0.15 o.n 0.09 0.07 0.25 0.25 0.23 0.22 0.22 0.21 -- 0.15 0.11 0.09 0.08 0.15 0.11 0.09 0.08 0.23 0.21 0.20 0.14 0.11 0.09 0.07 0.20 0.18 0.17 0.13 0.10 0.08 0.07 0.19 0.18 0.17 0.13 0.10 0.08 0.07 o.g 0.23 0.21/, - ^0.16 O.W., 0.09 0.08 8.40 8.80 4.00 4.8C 0.31 0.25 0.21 O.lf 0.30 0.24 0.20 0.17 0.27 0.23 0.19 0.17 0.23 0.19 0.17 0.15 0.21 0.18 0.16 0.14 0.22 0.19 0.16 0.14 0.22 0.18 0.16 0.14 0.21 0.18 0.15 0.14 0.18 0.16 0.14 0.12 0.17 0.15 0.14 0.12 0.23; 0.18J 0.10.14" w 0.4 1 0.6 t 0.8 ) 0.9 3 0.7 0.6* 0.6 0.5i 0.69 0.63 0.57 0.& 0.51 0.5* 0.41) 0.415 0.41 0.3S 0.36 0.34 0.3( 0.34 0.31 0.3 t 0.38 0.36 0.34 0.37 0.37 0.35 0.33 0.31 0.34 0.31 0.3 0.21) 0.27 0.26 0.25 0.24 0.26 0.25 0.24 0.2: 0-%.: Of).. o-te M Heat Transmission Coefficients of Building1 Materials 187- Table 6. Coefficients of Transmission (U)of Solid Masonry Walls (Concluded)* Interior Finish Extbriob Conbtbuctionc Plas. 96 in. on Wall Metal Lath and H in. Plab. on Fobbing Gypsum Xnsul. Bd. Lath Lath -.r (% IN.) AND 04 IN.)' AND 94 in. Plas. 94 in. Plas. on on Fubbing Fubbinc Wood Latb and 94 in. Plas.. (Sand Agg.) (Sand Agg.) (Sand Agg.) (Sand Agg.) ta % 0 2 Resistance j--> u te t* a .e < 6* s . t* 2* z. it. MM s o Z 0.1/ 0.50 0.18 O.i7 0.88 0.41 0.64 1.43 1.68 0.40 Material uR U U U U U UUUUU Concrete block (gravel agg.) (8 in.) (12 in.) (Cinder agg.) ` (8 in.) (12 in.) (Lt. wt. agg.) (8 in.) (12 in.) 1.11 0.52 0.48 0.43 0.33 0.29 0.31 0.30 0.28 0.23 0.22 0.30 1.88 0.47 0.45 0.40 0.31 0.28 0.29 0.28 0.27 0.22 0.22 0.29 1.78 0.39 0.37 0.34 0.27 0.25 0.26 0.25 0.24 0.20 0.20 0.25 1.89 0.36 0.35 0.32 0.26 0.24 0.25 0.24 0.23 0.19 0.19 0.24 8.00 0.35 0.34 0.31 0.26 0.23 0.24 0.24 0.22 0.19 0.19 0.24 8.87 0.32 0.31 0.28 0.24 0.22 0.23 0.22. 0.21 0.18 0.18 0.22 * See text section Calculating Overall Coefficients for basis of calculations. b To adjust U values see note just above this table. 9 if stucco or structural glass isapplied totheexterior. the additional resistance value of 0.10 would have a negligible effect on the. 1/ value. d Brick, 6 in. (594 in. actual) is assumed to have no backing. Walls 8,12 and 16 in. have 4 in. of face brick and balance of common brick. Insulating Materials In order to determine the benefit derived from the addition of insulating materials to a given construction, the overall coefficient of heat transmission Ui of the insulated construction may be compared with the corresponding coefficient U without insulation. Table 16 (Part A to Part E) and Fig. 6 may be used for determining the coefficients of transmission of construc tions with any combination of fibrous, bulk, or mass insulation and air spaces of various eSective emissivities. . Example 2: Find the coefficient of transmission of a frame wall consisting of % x 8 in. bevel lap wood siding, building paper, 2^32 in. wood sheathing, studs, gypsum lath, and sand aggregate plaster, with 2 in. fibrous insulation between studs. . Solution: According to the example calculation in Table 5 a wall of this.construchon with no insulation between studs has a coefficient U of 0.24. Referring to Table 16 Part A, it will be found that a wall of this value with 2 in. fibrous insulation be tween the studs has a coefficient V of 0.087. Attention is called to the necessity of applying the insulating material in accordance with the manufacturer's specification. The engineer must . uate carefully the economic considerations involved in the selection of an insulating material as adapted to various building constructions. Lack ni proper evaluation, or improper installation may lead to unsatisfactory esuits. Special attention must be given to vapor barriers as outlined in