Document Ra8YqgG8xOp521xb71az454nv

188 CHAPTER 9 1957 Guide Table 7. Coefficients of Transmission (U) of Masonry Walls* Coefficients are expressed in Bln per {hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on an outside wind velocsty of IS mph. Example I 2 34 5 6 78 Resistances used are given below in this table or in Table S or 4- Construction Resistance (R) 1. Outside surface (15 mph wind) O.lf 2. Face brick (4 in.) .(av. ft.)-----0.89- 3. Cement mortar 34 in................. 0.10 4. Concrete block (cinder agg.) (4 in.),.......................................... I-ll 5. Air 8paceb...................................... 0.97 6. Gypsum lath (96 in.).................. 0.88 7. Plas. (sand agg.) 34in............ 0.09 8. Inside surface (still air)............ 0.68 Total resistance....................... 6.88 U = 1/ft - 1/3.83 =............0.26 See value 0.26 in bold face type in table below. Example, of Substitution Resistances need are given below tn this table or tn Table 8 or 4. Replace items 6 and 7 with wood panels (34 in.) and vapor barrier applied over furring strips Total resistance.......... .......... ... 3.83 Deduct 6. Gypsum lath (36 in.)............0.3f 7. Pbs. (Sand agg.) 36 in.......... 0.09 Resistance deducted........ 0-41 Difference................................ 8.48 Add 6. Vapor barrier............................ 0.06 7. Wood panel (34 in.).................. 0.94 Resistance added............... 1.00 Total resistance ==............. 4-48 V = UR = 1/4.48 =............. 0.23 To Adjust U Values for Construction with Added Insulation between Fur ring Strips, See Table 16. Interior Finish Exterior Facing Backing Ss'M Z Metal Lath Peas. and 34 36 IN. ON Wall Plas. on Fur ring Gypsum Lath (36 in.) and 34 in. Plas. on Furring Insul. Bd. Lath (34 in.) a< and 34 in. Plas. on Fur ring so 2 Material Face brick 4 in. Stone . 4 .in.. . Precast concrete (sand agg.) 4 in. 6 in. Heat Transmission Coefficients of Building Materials 189 Table 7. Coefficients of Transmission (U) of Masonry Walls* (Concluded) Exterior Facing Backing Resistance N one I Interior Finish Metal Lath Plas. AND 34 36 in. ON IN. Wall PutS. on Fur ring Gypsum Lath (96 IN.) AND 34 in. Plas. on Furring T VBTTS Bd. Lath (34 in.) 'aa <2 U isAND 34 in. Plas. on Fur ring s *ao ej a-< s S.i twi t3 a QQ ei w Si . w 3 pH --t -aa w* Si . * CO 3 E 'UC e6Cc -o c w w &* 0.11 0.89 0.18 0.47 0.88 0.41 0.64 1.48 1.68 0.40 Material Av. R Matehiai. RUuUVUuUUUVU (sand agg.) _ 8 in. 0.64 Concrete block (Cinder agg.) (4 in.) (J ;"> (12 m.) (Lt. wt. agg.) (4 in.) (8 in.) (12 in.) (Sand agg.) (4 in.) (8 in.) (12 in.) Hollow clay Tile (4 in.) (8 in.) (12 in.) Concrete (Sand agg.) (4 in.) (6 in.) (8 in.) 1.11 0.36 0.35 0.32 0.26 0.24 0.25 0.24 0.23 0.19 0.19 0.24 1.78 0.29 0.29 0.26 0.22 0.21 0.21 0.21 0.20 0.17 0.17 0.21 1.89 0.28 0.27 0.25 0.21 0.20 0.21 0.20 0.19 0.17 0.17 0.20 1.60 0.32 0.30 0.28 0.23 0.22 0.22 0.22 0.21 0.18 0.18 0.22 8.00 0.27 0.26 025 0.21 0.20 0.20 0.20 0.19 0.16 0.16 0.20 8.87 0.25 0.25 0.23 0.20 0.19 0.19 0.19 0.18 0.16 0.16 0.19 0.71 0.42 0.40 0.36 0.29 0.26 0.27 0.27 0.25 0.21 0.21 0,27 1.11 ). 36 0.35 0.32 0.26 0.24 0.25 0.24 0.23 0.19 0.19 0.24 1.88 0.34 0.33 0.30 0.25 0.23 0.24 0.23 0.22 0.19 0.18 0.23 1.11 ).36 0.35 0.32 0.26 0.24 0.25 0.24 0.23 0.19 0.19 0.24 1.86 >.28 0.28 0.26 0.22 0.20 0.21 0.20 0.19 0:17 0.17 0.20 8.60 0.24 0.23 0.22 0.19 0.18 0.18 0.18 0.17 0.15 0.15 0.18 7.88 ).50 >.48 ).42 ).32 ).29 ).30 0.30 0.28 >.23 0.22 ).30 7.48 >.47 0.44 ).39 >.31 0.28 0.29 ;> 2 0.27 0.22 0.22 ).28 O.Si 0.43 0.41 0.37|0.29 0.27 0.28 0.27 0.260.21 0.21 0.27 ^ section Calculating Overall Coefficients for basis of calculations. To adjust U values see note just above this table. Chapter 10. Moisture from condensation or other sources materially re duces the heat-flow resistance of insulation. INSULATED CONSTRUCTIONS--HOW TO USE TABLE 16 , Tables 5 through 15, U values are given for many common types of ,.chng wall, floor, and ceiling constructions. For such of these construc tions as contain an air space, the tabulated U value is based on the assump tion that the air space is empty, and that its surfaces are of ordinary build- g materials of low thermal reflectivity, such as wood, masonry, plaster or Paper. Considerable benefit in reducing the heat transmission coefficient a construction can be effected by the application of thermal insulating materials in the air space. v 16 provides a means of determining, without calculations, the U insui6*- between-framing area of such constructions with the added U V | on installed in the air space. Column 1 of Table 16 refers to the Colii 6S * PHiesnlated constructions as taken from Tables 5 through 15. stru t^nS ^ f the table give corresponding coefficients Ui for the con- SDapCtl0nS- various insulating applications in the between-framing air q r-5' 88 indicated by the column headings. Table 16 is in 5 parts, (A, B, ' . and E) corresponding to. the type of building element and the direc-