Document mqkLqdROvGn7d01oM824rk91Q

HEATINC VENTILATING AIR CONDITIONING CUIDE 1941 Table 5. Coefficients of Transmission (U) of Various Types of Frame Construction^ These coefficients are expressed in Btu 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. TYPICAL CONSTRUCTION EXTERIOR FINISH TYPE OF SHEATHING Wau, No. 1 in. Wood* Wood Siding or Clapboard *Ka in- Rigid Insulation H in. Plasterboard 65 66 67 Wood Shingles I in. Wood* 3Ms in* Rigid Insulation* M >n. Plasterboard' 68 69 70 Stucco I in. Wood* 3Ma in. Rigid Insulation in. Plasterboard 71 72 73 Brick/ Veneer 1 in. Wood* in. Rigid Insulation 74 75 M in. Plasterboard 76 "Computed from (actors marked .by * in Table 2. `These coefficients may also be used with sufficient accuracy for plaster on wood lath or plaster on plasterboard. 'Based on the actual width of 2 by 4-in. studding, namely. 3$ in. 88 CHAPTER 3. HEAT TRANSMISSION COEFFICIENTS AND TABLES INTERIOR FINISH No Insulation Between Studding Insulation Between Studding - oof *T33J 0a 3 a 1 a0 7* 1 i oa jj -3 g 3 3 a a 0*0 -1s* ea u Ma X2w *ao 5-3 S.2 JU Is ft-o AB C 0.25 0.26 0.25 5 M 9 C *o 2 Sg .SS sl ss Is D 0.19 Plaster in.) on rigid insulation (1 in.) on studding Plaster ( ty in.) on plasterboard ( M in.)--air space faced on one side with bright aluminum foil cemented to plasterboard Plaster ( H in.) on metal lath* on studding--flexible insulation (1 in.) between studding--2 air spaces E 0.15 d 5 2 1 oo o 5| SS li F 0.11 2 "5 1. ,-hX 'Crfj ?! h11 5*2 u M 2: .2 G 0.19 & *c a> oa II a9 2a il *3 H 0.17 ao c-2 " i ,3W.2 --111a ! 5 **3 Sd 2.3s 2 = 1 -- .2 -jla e sN 8-SL :?!1 IsS. 111! fin n-fioj 31 5a. 3 -g I J KL 0.19 0.17 0.15 0.12 0 iZ 1- =i Sts $ff III M 0.072 0.19 0.20 0.19 0.15 0.13 0.10 0.16 0.14 0.15 0.15 0.13 0.10 0.068 0.31 0.33 0.31 0.22 0.17 0.13 0.23 0.19 0.22 0.20 0.17 0.13 0.076 0.25 0.26 0.25 0.19 0.15 0.11 0.19 0.17 0.20 0.17 0.15 0.12 0.072 0.17 0.17 0.17 0.14 0.11 0.092 0.14 0.14 0.15 0.13 0.11 0.094 0.064 0.24 0.25 0.24 0.19 0.15 0.11 0.19 0.19 0.22 0.17 0.15 0.12 0.071 0.30 0.32 0.30 0.22 0.16 0.12 0.22 0.19 0.23 0.20 0.17 0.13 0.076 0.22 0.23 0.22 0.17 0.14 0.11 0.19 0.15 0.17 0.16 0.14 0.11 0.071 0.40 0.43 0.40 0.26 0.19 0.14 0.28 0.22 0.26 0.24 0.20 0.24 0.081 " 0.27 0.28 0.27 0.20 0.15 0.12 0.21 0.17 0.21 0.18 0.16 0.12 0.074 0.21 0.21 0.21 0.16 0.14 0.10 0.17 0.15 0.16 0.15 0.13 0.11 0.068 0.35 0.37 0.35 0.24 0.18 0.13 0.25 0.21 0.24 0.22 0.18 0.14 0.079 *Yellow pine or fir--actual thickness about H*j in. 'Furring strips between wood shingles and sheathing. 'Small air space and mortar between building paper-and brick veneer neglected. 'A waterproof (not vaporproof) membrane should be provided between the outer material and the insulation fill to prevent possible wetting by absorption and a subsequent lowering of efficiency. `The coefficients in this column are corrected for the effect of studs. 89 A