Document pmdMdY2VnzevnKaG3VvYyN4ME

184 CHAPTER 9 1958 Guide Table 5. Coefficients of Transmission (U) of Fbame Walls* These coefficient* are expressed in Btu per (Acur) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on an outside wind velocity of 15 mph. Example Resistances used are given below in this table or in Table S or 4 Construction Resistance (R) 1. Outside surface (15 mph wind) 0.17 Ob, oiuing, w11 noMoa, 1 >A3 m. wx Oo .iMn. lapped (av. R).......................... 0.85 3. Building paper........................... 0.08 4. Wood sheathing (2$it in.) - - 0.98 5. Air space................................... 0.07' 6. Gypsum lath (H in.)............... 0.88 7. Plaster (sand agg.) H in......... 0.09 8. Inside surface (still air)......... 0.88 Total resistance...................... 4-18 U 1/R = M4.lt =... 0.24 See value 0.24 in bold face type in table below. To Adjust U Values for Construction with Added Insulation between Framing Members, See Table 16. Example of Substitution Resistances used are given below in this table or in Table S or 4 Replace items 3 and 4 with insul. bd. sheathing (3%s in.), and items 6 and 7 with gypsum wall board <H in.) Total resistance..................... 4.18 Deduct 3. Building paper....................0.06 4. Wood sheathing (*%* in.). 0.98 6. Gypsum lath (% in.)....... 0.88 7. Plaster (sand agg.) Min... 0.09 Resistance deducted... I.46 Difference........................ 8.67 Add 4. Insul. bd. sheathing (2Hs in.)......................................... 8.06 | Gypsum bd. (Y in.)....... O.45 Resistance added...........8.51 Total resistance............... 5.18 U = MR " U6.18 =......... 0.19 T YPE OF 8 BEATHINCi Exterior0 Interior Finish a! 0 2 3 Oa < 0 n CQ 03 .a B 0. g* 2 < Ex OPh Za 2 a 0 0 IS h i*">*wp S(L # w. 3J s oCQ & ZO 5d H<0a3 P 52 sea Y 'Ms IN. IN. Resistance 0.06 0-45 0.89 1.0( 1.88 8.06 Material Av. R Material R U u UUUV None - 0.57 0.47 0.48 0.36 0.33 0.27 Gypsum bd. (M in.)................................ 0.88 0.33 0.29 0.30 0.25 0.23 0.20 Gypsum lath (% in.) and Y in. plas. (It. wt. Wood siding agg.)................................................................... 0.64 0.30 0.27 0.27 0.23 0.22 0.19 Gypsum lath in.) and Y in. plas. (sand Drop--(1 in. x 8 0.79 **).................................................................. 0.41 0.32 0.28 0.29 0.24 0.23 0.19 Bevel (Y in. x f Metal lath and H in. plas. (It. wt. agg.)......... 0.47 0.31 0.20 0.2C 0.24 0.22 0.19 0.81 0.85* Metal lath and H in. plas. (sand agg.)........... 0.18 0.35 0.31 0.31 0.26 0.24 0.21 Wood shingles 7Y in. exposure 0.87 Wood panels (M Insul. bd. 04 in.)............................................... 1.48 0.24 0.22 0.22 0.19 0.18 0.16 Insul. bd. lath 04 in.) and Y in. plas. (and in.) 0.94 *)................................................................... 1.68 0.24 0.22 0.22 0.19 0.18 0.16 Plywood (V4 in.)........................*....................... 0.81 0.33 0.29 0.30 0.25 0.23 0.20 Wood panels (M in.).......... ............................. 0.94 0.27 0.25 0.25 0.22 0.20 0.18 Wood lath and Y in. plas. (sand agg.)............ 0.40 0.32 0.28 0.29 0.24 0.23 0.19 Face-brick Plywood (M in.) None..................................................................... - 0.73 0.56 0.58 0.42 0.38 0.30 Gypsum bd (M in.)....................................... 0.88 0.37 0.33 0.33 0.27 0.25 0.21 Gypsum lath (% in.) and in. plas. (It. wt.. agg.).................................................................. 0.64 0.33 0.30 0.30 0.25 0.24 0.20 Gypsum lath (% in.) and Y in. plas. (sand. agg.).................................................................. 0.41 0.36 0-32 0.32 0.27 0.25 0.21 0.44 0.(5* Metal lath and H in. plas. (It. wt. agg.)......... Metal lath and H in. plas. (sand agg.)......... 0.47 0.35 0.31 0.32 0.26 0.25 0.21 0.18 0.40 0.35 0.36 0.29 0.27 0.22 0.47 Insul. bd. 04 in.)............................................... 1.48 0.26 0.24 0-24 0.21 0.20 0.17 Insul. bd. lath 04 in.) and Yi in. plas. (sand agg.).................................................................. 1.68 0.26 0.23 0.24 0.21 0.19 0.17 Plywood 04 in.)...................... ........................ 0.81 0.30 0.30 0.33 0.27 0.26 0.21 Wood panels (M in.).......................................... 0.94 0.30 0.27 0.28 0.23 0.22 0.19 Wood lath and Y in. plas. (sand agg.)........... 0.40 0.36 0-32 0.32 0.27 6.25 0.21 Heat Transmission Coefficients of -Building Materials 185 Table 5. Coefficients of Transmission (U) of Frame Walls (Concluded) Exterior* Material Interior Finish Material Type op Sheathing 0 z 3 CQ es B pj z0P1 G yYp is nu m . B oard a z< 63 ,z. A 55. -<S0B0 go-g K a0 : ^3 z *1 & 0 0p o Ys & IN. IN. I 1 't* 0.06 0.45 0.89 1.04 1.88 8.06 UUVUUU None.. 0.43 0.37 0.38 0.30 0.28 0.23 Gypsum ,bd. (% in.).......................................... 0.88 0.28 0.25 0.25 0.22 0.20 0.18 Gypsum lath (% in.) and H in. plas. (It. wt. agg.)................................................................... 0.64 0.25 0.23 0.23 0.20 0.19 0.17 Gypsum lath (% in.) and Vi in. plas. (sand agg.).................................................................. 0.41 0.27 0.24 0.25 0.21 0.20 0.18 Wood shingles over insul.: backer Metal lath and H in. plas. (It. wt. agg.)......... bd. (Mein.) 1.40 1.(5* Metal lath and % in. plas. (sand, agg.)......... Asphalt inm!. aid 0.27 0.24 0.24 0.21 0.20 0.17 0.29 0.26 0.27 0.23 0.21 0.18 ing 1.45 Insul. bd. (H in.)............................................... 0.21 0.20 0.20 0.18 0.17 0.15 Insul. bd. lath (Y in.) and Y in. plas. (sand agg.)..................................... ............................. 0.21 0.19 0.19 0.17 0.16 0.15 Plywood (H in.)....... Wood panels (H in.). 0.81 0.28 0.25 0.25 0.22 0.20 0.18 0.94 0.24 0.22 0.22 0.19 0.18 0.16 Wood lath and Vi in. plas. (sand agg.). 0.40 0.27 0.24 0.25 0.21 0.20 0.18 None.. 0.91 0.67 0T70 0.48 0.42 612 Asbestos-cement siding o.tl Stucco* 1 in. 0.80 0.10* Asphaltrollsiding 0.15 Gypsum bd. (9 in.)......................................... 0.88 0.42 0.36 0.37 0.30 0.27 0.23 Gypsum lath (% in.) and Y in. plas. (It. wt. agg.)........................................................ 0.64 0.37 0.32 0.33 0.27 0.25 0.21 Gypsum lath (% in.) and Y in. plas. (sand agg.)................................................................... 0.41 0.40 0.35 0.36 0.29 0.27 0.22 Metal lath and % in. plas. (It. wt. agg.)......... 0.47 0.39 0.34 0.35 0.28 0.26 0.22 Metal lath and H in. plas. (sand agg!)........... 0.18 0.45 0.39 0.40 0.31 0.29 0.24 Insul. bd. (Y in.)............................................... 1-48 0.29 0.26 0.26 0.22 0.21 0.18 Insul. bd. lath (Y in.) and Y in. plas. (sand agg.)................................................................... 1.58 0.28 0.25 0.26 0.22 0.21 0.18 Plywood (M in.)........ Wood panels (M in.). 0.81 0.42 0.36 0:37 0.30 0.27 0.23 0.94 0.33 0.29 0.30 0.25 0.23 0.30 Wood lath and Y in. plas. (sand agg.).......... 0.40 0.40 0.35 0.36 0.29 0.27 0.22 "ee tex* section Calculating Overall.Coefficients for basis of calculations. To adjust U values see note just above this table. the samp^w* although several types of exterior finish may be grouped because they have approximately types of she^Sngljated1106 va*ue' ** not that all types may be suitable for application over all a i^verage resistance of items listed. This average was used in computation of U values shown. Building paper is not included except where noted. * Small-*-*-* space between building paper and brick veneer neglected. quired^ht i!iCCu " applied over insulating board or gypsum sheathing, building paper is generally re- ' * ine change in U value is negligible. tr mstallation have an increasingly greater percentage effect on heat meet*?S^n ^ coecien* becomes numerically smaller. Failure to comnl'1^11 e?^'ma*;es may be caused by lack of proper attention to exact * nrono 'f^ce specifications. A factor of safety may be employed as a ution when it is judged desirable.