Document nmqXEBn6g7zjnV4NnMOwd1jKa

112 CHAPTER 9 1960 Guide Table 5 .... Coefficients of Transmission (U) of frame Walls* These cotfRoeafs an expressed In Bte per (boor) (square foo/) (fahwthe# degree difference in temperature between ftw err on /A* two Med, and art bated on on outride wind velocity of 15 mph Example--Wall 0 4 Example of Substitution Resistances used are jwen below in this idle or in Taife 5 or 4 Construction Resistance (li) 1. Outside surface (15 mph wind)........................ 0.17 2. Biding, wood, 94 in. x 8 in. lapped (av. R)___0.85 3. Building paper....................................................... 0.06 4. Wood sheathing (*94t in.).............. 0.W 5. Air Bpace*............................................................. 0.91 8. Gypsum latb (94 in.)......................................... O.SS 7. Plaster (sand egg.) 0$ in)................................ 0.09 8. Inside surface (still air).................................... 0.68 Total resistance................................................. 4.tt U 1/R -= U4.lt -.........................................0.24 See value 0.24 in boldface type in table below. Resistances used are ffiven below in this table or in Table S or 4 Replace items 3 and 4 with insul. bd. sheathing (*9i* in.) and items 6 and 7 with gypsum wall board (94 in.) Total resistance...................................................... 4.It Deduct 3. Building Paper.....................0.06 ft. Wood sheathing (*9ia in.).. 0.98 6. Gypsum lath (94 in.)......... O.St 7. Plaster (sand agg.) (94 in).. 0.09 1.46 Difference....................................................... t.67 Add 4. Insul. bd. sheathing (*94 in.)... t.06 y'jOypsum bd. 0$ in.).................. 0.4S t.St Total resistance.........................................................6.18 U - 1/R - 1/6.18 -............................................... 0.19 To Adjmf U Volvo* for Construction with Added Insulation between Fromiafl Members, So* Table 16. Type of Sbeatbmg* Exterior* Interior Finub Resistance Insultitien None, BuHd- ing Paper Gyp sum Board H hi- Ply wood M* Wood, Bo 3rd Shea and Bulld og Paper Hi"- Hi * 0.06 0.45 0.39 1.04 1.32 2.06 Js z Material Materiel VU u U U ftA c 0 E F Wood siding Drop--(1 m. % 8 in.) Bevel (H in. x 8 in.) Wood shingles 7)4 in. exposure Wood panels (94 in.) None..................................................................... 0.57 Gypsum bd. (94 in.)......................................... O.St 0.33 Gypsum lath (94 in.) and 94 in. plas. (It. wt. 0.64 0.30 Gypsum lath (94 in.) and H in. plas. (sand agg).................................................................. OM 0.32 0.7f Metal latb and 94 in. plas. (it. wt. am.). .. O.47 0.31 0.81 0.86* Metal lath and 9 in. plas. (sand agg.)........ o.n 0.35 0.87 0.94 InsuJ. bd. (H in.).............................................. l-4i 0.24 Insul. bd. lath 04 in.) and 94 in- plas. (sand agg.).................................................................. t.6t 0.24 0.47 0.29 0.27 0.28 0.28 0.31 0.22 0.22 0.48 0.30 0.27 0.29 0.28 0.31 0.22 0.22 0.36 0.25 0.23 0.34 0.24 0.26 0.19 0.19 Plywood (W in.)......... ...................................... 0.SI 0.33 0.29 0.30 0.25 Face-brick veneer* Plywood (94 in.) O.U 0.46 0.47 Wood lath and H in. plas. (sand agg.)........ None..................................................................... Gypsum bd. @4 in.)...................................... UvDsum lath ($4 in.) and K in. nlas. fit. wt. Gypsum lath (94 in.) and M in. plas. (sand ssJ................................................................. 0.40 0.32 _ 0.73 O.SS 0.37 0.64 0.33 0.41 0.36 0.28 0.56 0.33 0.30 0.32 Metal lath and 94 in. plas. (It. wt. axe.)... 0.47 0.35 0.31 Metal lath and 94 in. plas. (sand agg.)........ 0.1s 0.40 0.35 Insul. bd. 04 in.).............................................. Insul. bd. lath 04 in-) and H in. plas. (sand agg.)................................................................. Plywood 04 in.)......... ...................................... Wood panels 04 in.)......................................... Wood lath and >4 in. plas. (sand agg.)........ t-43 0.26 1.61 0.26 O.St 0.38 0.94 0.30 0.40 0.36 0.24 0.23 .0.33 0.27 0.32 0.29 0.58 0.33 0.30 0.32 0.32 0.36 0.24 0.24 O.SJ, 0.2S 0.32 0.24 0.42 0.27 0.25 0.27 0.26 0.29 0.21 0.21 0.27 0.23 0.27 0 33 0.27 1 0.23 0.20 3 0.22 O.lfl 3 0.22 0.19 4 0.22 0.1S 6 0.24 0.21 6 0.1J 0.16 7 0.18 0.16 8 0.23 0.20 9 0.23 0.19 U 0.38 0.30 13 0.2s 0.21 IS 0.24 0.2C 14 0.25 0.21 16 0-25 0.21 16 0.27 0.22 17 0.20 0.17 18 0 Ifi 0.17 19 0.26 021 20 0.22 0.19 21 0.25 0.21 22 Heat Transmission Coefficients of Building Materials 113 Table 5____Coefficients of Transmission (U) of Frame Walls* (Concluded) Typo of Sbecthcng* Exterior* Interior Ftatsfi IftSUtetioA 6u&4- Ing taper GypWB Board 94*. Ply Wood, Board Sheathing wood and Bead X. i* ing Paper 94 *- Hi jft. Jteritfaac* j-- 0.06 0.45 0.39 1.04 1.32 2.06 6 Z R *0* Material U uU Jt U --V AB C D Wood shingles over Gypsum bd. ($4 in.)........................................ Gypsum lath (94 in.) and M in. plas. (It. wt. Gypsum lath (94 in.) and M in. plas. (sand *).................................................................. _ 0.43 O.St 0.28 0.64 0.25 0.41 0.27 bd. (M in.) 1.40 i.4t* Metal lath and 94 in. plas. (It. wt. agg.). .. 0.47 0.27 Metal lath and % in. plas. (sand agg.)....... O.li 0.29 1-46 Insul. bd. (94 in.).............................................. i-U 0.21 Insul. bd. lath (94 in.) and 94 in. plas. (sand agg.)............... .................................................. t.St 0.21 0.37 0.25 0.23 0.24 0.24 0.26 0.20 0.19 0.38 0.25 0.23 0.25 0.24 0.27 0.20 0.19 0.30 0.22 0.20 0.21 0.21 0.23 0.18 0.17 0.28 0.23 23 0.20 O.U 24 0.19 0.17 25 0.20 0.18 26 0.20 0.17 27 0.21 O.U 28 0.17 O.U 29 0.16 0.15 30 Asbestos-cement Asphalt roll siding Plywood (H in.) Wood (ath and M in. plas. (sand agg.)........ Gypsum bd. (94 in.)......................................... Gvnsum lath (94 in.) and H in. plaa. (It. wt. Gvraum latb (94 in.) and 44 in. Plas. (sand 0.S1 0.28 0.94 0.24 O.iO 0.27 __ 0.91 O.Sl 0.42 0.64 0.37 0.41 0.40 O.St O.tt 0.16 0.19* Metal lath and 94 in. piss. (It. wt. agg.)... Metal latb and 94 iarplas. (sand agg.)....... Insul. bd, (H in.).............................................. Insul. bd. lain (M in.) and 94 in. plas. (sand agg.)................................................................. 0.47 0.39 O.U 0.45 1.41 0.29 I.St 0.28 0.25 0.22 0.24 0.67 0.36 0.32 0.35 0.34 0.39 0.26 0.25 0.25 0.22 0.25 0.70 0.37 0.33 0.36 0.35 0.40 0.26 0.26 0.22 0.19 0.21 0.48 0.30 0.27 0.29 0.28 0.31 0.22 0.22 0.20 0.18 31 O.li O.lt 32 0.20 0.18 33 0.42 0.32 34 0.27 0.2: 35 0.25 0.21 88 0.21 0.22 37 0-2f 0.22 38 0.2) 0.2< 89 0.2J O.U 411 0.21 0.18 41 Plywood (94 in.).................... .......................... O.Sl 0.42 0.36 0.37 Wood panels (94 in.)......................................... 0.9i 0.33 0.29 0.30 Wood lath and 94 in. plas. (sand agg.)........ 0.40 0.40 0.35 0.36 0.30 0.25 0.29 0.27 0.23 42 o. 0.21 43 0.27 0.2^ 44 * See tatseciios Overall Coefficient* lor but* of mlrnletione b To adjust V veluas lor tbe efleetof added inmilation between fruniag members, see Table lft. c Note Unt although several types of exterior finish may be grouped beeaoae they have approximately the same tbdrtnal Msostaaco valve, it is not implied that all type* may bo saitable for application over *Q types of sheathing listed. * Average netstaaeec* item*listed. This average was oaed ia eomputatioa of V values shown. * BuSding paper ia aot indtrdad except where noted. * Small air *paee between building paper and hriek veneer neglected * Where ctoceo b applied over insulating board or gypeua sheathing, building paper is generally required, but the change ia O value is negligible. rimL- --------------------------------------------- ----- ------------ |-V."1----- '-- i AIR S3 FT O SQ FT 0302 1 O 0302 .1 ^2 O 0.302 V ' -1. *. I ,4 #3 0032 0.230 1---------------------------------- r\\V\y; vA\\\ 0.0(0 0.202 1 , | AIR O 0.302 ----------------zone a - --------- -- ^ e PART OT AIR FU.M Fig. 6 .... Enlarged Section of Zone A of Fig. 5 Solution: The baste area is 2 so ft (24 in. x 12 in.), with s teebar (12 in. long) across the middle. This area is divided into two zones, A and B. Zone A is determined from Equation 4 as follows: s Top Side W - m + 2d - 0.625 + 2X 1.5 - 3.625 in. Bottom Side W -* m -f- 2d = 2.0 + 2X 0.5 3.0 in. Using the larger value of W, the area of Zone A is (12 X 3.625)/144 * 0.302 sq ft. The area of Zone B is 2.0 - 0.302 -> 1.698 sq ft. To determine the ares transmittance for Zone A the struc ture within the zone is divided into five sections parallel to the top and bottom surfaces as shown in fig. 6. The area con ductance C-A of each section is calculated by adding the area conductances of its metal and non-metal paths. The area con ductances of the sections are converted to area resistances