Document B879NQOwLjd4knG9BLbppdLLE

186 CHAPTER 9 1958 Guide - ^ y Table 6. Coefficients of Transmission (f/) of Solid Masonry Walls* ;y: Coefficient* 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 IS mph. . I 2 34562 Example Resistances used are given below in this table or in Table 9 or l. Construction Resistance (R) 1. Outside surface (IS mph wind) 0.17 '2. Face brick (4 in.)..................... 0.44 3. Common brick (4 in.).............0.80 4. Air spaceb.................................. 0.97 5. Gypsum lath (94 in.).............. O.St 6. Plas. (sand agg.) )4 in.............0.09 7. Inside surface (still air)......... 0.68 Total resistance..................... 9.47 U * 1/fi * 1/347 -..........0.29 See value 0.29 in bold face type in table below. Example of Substitution Resistances used are given below in ' V- this table or in Table 9 or 4. V Assume plain wall--no furring or plaster. Total resistance........................347 ,:VDeduct 4. Air space............................... 0.07 5. Gypsum lath ($4 in.).......O.St 6. Plas. (sand agg.) 44 in.... 0.09 . -V Resistance deducted___ t.88 Total resistance............. 8.09*,*.. U = l/R = 1/s.09 ... 0.48 To Adjust U Values for Construction with Added Insulation between Fur* >; ring Strips, See Table 16. Interior Finish Exterior Construction6 PLA8. 44 IN. on Wall Metal Lath and 94 IN. Plas. on Fubring Gypscu Lath (44 in.) and 44 in. Plas on Fobbing Insul. Bd. Lath (44 IN.) AND 44 in. Plas. ON Furring Wood Lath and 44 in. Plas. 3B is dz o z zZ *me*e<g is th .m e* ~0 ti S-? CD tS th .w 3 o T3 th a < CD .o g< o T3 th a CD 13 U O* *< CO Resistance j--> 0.11 0.39 0.13 0-47 0.32 0.41 0.64 1.43 1.58 0.40 Material R V U U V U V U V u- U U Brick (face and common)^ (8 in.) (12 in.) (16 in.) 0.61 1.94 9.04 9.84 0.68 0.48 0.35 0.27 0.64 0.45 0.33 0.26 0.54 0.41 0.30 0.25 0.39 0.31 0.25 0.21 0.34 0.28 0.23 0.19 0.36 0.30 0.24 0.20 0.35 0.33 0.29 0.27 0.23. 0.22 0.20 0.19 0.26 0.22 0.19 0.16 0.25 0.22 0.19 0.16 0.35 0.29 0.23 0.20- Brick (common only)' (8 in.) (12 in.) (16 in.) 1.60 8.40 9.90 0.41 0.31 0.25 0.39 0.30 0.24 0.35 0.27 0.23 0.28 0.23 0.19 0.26 0.21 0.18 0.27 0.22 0.19 0.26 0.22 0.18 0.25 0.21 0.18 0.21 0.18 0.16 0.20 0.17 0.15 0.26 0.22 0.18 Stone (lime and sand) (8 in.) (12 in.) (16 in.) (24 in.) 0.64 0.96 1.98 1.99 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 0.25 0.23 0.22 0.19 0.35 0.31 &0.29 0.24. Hollow clay tile (8 in.) (10 in.) (12 in.) 1.85 9.98 8.60 0.36 0.33 0.30 0.36 0.31 0.29 0.32 0.29 0.27 0.26 0.24 0.22 0.24 0.22 0.21 0.25 0.23 0.22 0.25 0.22 0.21 0.23 0.21 0.20 0.20 0.18 0.17 0.19 0.18 0.17 0.25 0.23: 0.21 Poured concrete 30 lb per cu ft (4 in.) (6 in.) (10 in.) 4-44 6.66 8.88 11.10 0.19 0.13 0.10 0.08 0.19 0.13 0.10 0.08 0.18 0.13 0.10 0.08 0.16 0.12 0.09 0.08 0.15 0.11 0.09 0.07 0.15 0.11 0.09 0.08 0.15 0.11 0.09 0.08 0.14 0.11 0.09 0.07 0.13 0.10 0.08 0.07 0.13 0.10 0.08 0.07 . -V 0o..1n5 0.091 -i *>< 0.08 80 lb per cu ft (6 in.) (8 in.) (10 in.) (12 in.) 8.40 0.31 9.80 0.25 4-00. 0.21 4.80 0.18 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 0.18 0.18 0.14- 140 lb per cu ft (6 in.) (8 in.) (10 in;) (12 in.) 0.48 0.64 0.80 0.96 0.75 0.67 0.61 0.55 0.69 0.63 0.57 0.52 0.58 0.53 0.49 0.45 0.41 0.39 0.36 0.34 0.36 0.34 0.32 0.31 0.38 0.36 0.34 0.32 0.37 0.35 0.33 0.31 0.34 0.32 0.31 0.29 0.27 0.26 0.25 0.24 0.26 0.25 0.24 0.23 0.37. 0.35 0.33 0.31 Heat Transmission Coefficients of^Biiilding. Materials 187 Table 6. Coefficients of Transmission,.(C/)of : Solid Masonry Walls, (Concluded)? Intebiob Finish Extebiob Construction6 Resistance Material R Metal Insul. Bd; Wood Plas. $4 tN. 94 (94 0444 44on Wall Lath And Gypsum Lath in. Plas. in.) and'H in. i on Plas. on Furring - Lath -Lath IN.). AND AND. in.- Plas. in. Furring on Furring Plas. (Sand Agg.) (L t. wt. ; Agg.) J (Sand Agg.) (L t. Wt. Agg.) (Sand Agg.) (L t. W t. Agg.) (Sand Agg.) (Sand Agg.) d EB a 3- zo Z oo Z Z" 0.11 0.99 0.19 0.47 0.99 0.41 0.64 1.4s 1.58 0.40 V U . U\ U u U U V U U U 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 1.98 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 6.27 6.25 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 t-hiq table. V stucco or structural glass is applied to the exterior, the additional resistance value of 0.10 would have a negligible effect on the U value. Brick, 6 in. (5)4 in. actual) is assumed to have no backing. Walla 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 effective emissivities. in Find the coefficient of transmission of a frame wall consisting of x 8 lath anA aP "d siding, building paper, in. wood sheathing, studs, gypsum ' ana sand aggregate plaster, with 2 in. fibrous insulation between studs. tioni?;*L>n: According to the example calculation in Table 5 a wall of this construc- 16 Part ^*? insulation between studs has a coefficient U of 0.24. Referring to Table * be found that a wall of this value with 2 in. fibrous insulation be tween the studs has a coefficient U of 0.087. accord n^n *s.ca^e<i the necessity of applying the insulating material in evali f1106 W'^ the manufacturer's specification. The engineer must an ins l ,c.are^uUy the economic considerations involved in the selection of 0{ ulatmg material as adapted to various building constructions. Lack results>erqeVa'Uatin, or imProPer installation may lead to unsatisfactory Special attention must be given to vapor barriers as outlined in