Document B5jzKjgrJwL5Bo5zMZV1NxozX

HEATING VENTILATING AIR CONDITIONING CUIDE .1940 CHAPTER 5. HEAT TRANSMISSION COEFFICIENTS AND TABLES Table 5. Coefficients of Transmission (U) of Various Types of Frame Construction0 INTERIOR FINISH 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. No Insulation Between Studding Insulation Between Studding Piaster (J4 in.) on plasterboard lj ( in.) on Btudding lA No plaster--decorated rigid or build ing board interior finish 0 4 in.) Plaster ($4 in.) on metal lath6 on studding--flexible insulation (1 in.) between studding--2 air spaces ;;! I S-n TYPICAL CONSTRUCTION EXTERIOR FINISH TYPE OF SHEATHING Wall . No. ' ( a0 a J3 '<9 | a1 ao i d ao 1a * o 39 a 9 -ca i r~--a *3 sz .2 ' 39 a -o ;a 5 atc .?! s! B ' s 1 1 o a a i W II ,-g it la a i g.s *T3 3-a TS eo ^gMM *S 3X* s - 3* 33-sSo 1 So- S. _a co .~l^J '_"JJj3a M a d= sjl e-- .S 3=a --O ll-l Ht Js e-j-3T-03 o _~c is -- *n 3a 1" ' 111 O a |S ill ifl0 5 . ca Sis jf iu1 Jl"? ft0 P* a ' o IX o o Ohw SI &3 tx o ,?bs ^ M1 - .S s'" | Sif- a-gSg JJi $=3 8 111 r- AB C D E FGH I J K LM 1 in. Wood* . ' 0.25 0.26 0.25 0.19 0.15 0.11 0.19 0.17 0.19% 0.17 0.15 0.12 0.072 65 Wood Siding or Clapboard in. Rigid Insulation H in. Plasterboard 66 i 67^ 0.19 0.20 0.19 0.31 0.33 0.31 0.15 0.22 0.13 i\:' 0.17 0.10 0.13 0.16 0.23 0.14 0.19 0.16 0.24 0.15 0.20 0.13 0.10 0.17 0.13 0.068 0.076 Wood Shingles' 1 in. Wood4 68 in. Rigid Insulation*' 69 K In. Plasterboard* - - 70;' 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 0.14 0.13 0.11 0.094 0.064 0.24 0.25 0.24 0.19 0.15 0.11 0.19 0.19 0.19 0.17 0.15 0.12 0.071 Stucco .1- in. Wood4 : 71 *%3 in. Rigid Insulation 72 in. Plasterboard > 73-. 1 in. Wood4 74 Brick' Veneer in. Rigid Insulation ; 75 J4 in. Plasterboard 76 "Computed from factors marked by * in Table-2. 6These 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. 104 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 0.18 0.16 0.14 0.11 0.071 0.40 0.43 0.40 0.26 0.19 0.14 0.28: 0.22 0.29 0.24 0.20 0.14 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 0.21 021 0.21 0.16 0.14 0.10 . 0.17 0.15 0.17 0.15 0.13 0.11 0.068 0.35 0.37 0.35 0.24 . 0.18 0.13 0.25 : b.2i; 0.26 0.22 0.18 0.14 0.079 rfYellow pine or fir--actual thickness about % in. , 'Furring strips between wood shingles and sheathing. 'Small air space and mortar between building paper and brick veneer neglected. A waterproof membrane should be provided between the outer material and the insulation fill to *,reJ*nt possible wetting by absorption and a subsequent lowering of efficiency. Stud and rock wool fill areas combined.