Document rp6Bj97MmZN8zO7zaV38voNyV

102 CHAPTER 9 1959 Guide Table 5 .... Coefficients of Transmission (l/) of Frame Wolk* These coeffideari ore exprenod in Bfo per (hour) (fuare foot) (fofcrWiert degree difference in temperature between Ae tar oo the two itdet), and are bated on an outride wind vefodfy of 15 mph Exasapie--WaiJ 0 4 fxoopfe of Substitution Resistance* used are given below in this table or in Table 5 or 4 Construction Resistance (R) 1. Outside surface (15 mph wind).......................... 0.17 2. Siding, wood, K in. x 8 in. lapped (av. i2).... O.SS 3. Building paper......................................................... 0.06 4. Wood sheatniug (*H* in-).................................. 0-M 5. Air space*.................................................................. 0.97 6. Gypsum lath in.)............................................. O.SS '7. Piaster (sand agg.) (^ in).................................. 0.09 8. Inside surface (still air)....................................... 0.68 Total resistance....................................................... 4-18 U - l/R 1/4 Jt -............................................ 0.24 See value 0.24 in boldface type in table below. Resistances used are given below in this table or in Table S or 4 Replace items 3 and 4 with insul. bd. sheathing (*^2 in.) and items 6 and 7 with gypsum wall board (H Is-) Total resistance.......................................................... 4-IS Deduct 3. Building Paper...................... 0.06 *4. Wood sheathing (*M* in-)-. 0.98 6. Gypsum lath (J4 in.).......... O.SS 7. Plaster (sand agg.) (& in).. 0.09 1.46 Difference...................................................................... S.67 Add 4. Insul. bd. sheathing (*Ms to-) - - 8.06 y jGypsum bd. (J4 in.)........................ 0.46 8.61 Total resistance....................................... 6.18 [/=!/- 1/5.18 -............................................ 0.19 To Adjust U Vuhtes for Construction with Added tnsutotion between Frontnp Members, See Tebio 16. Type of Sheathing* Exterior* Inferior Finish Hone, GypBuild- )4 in. Insole lion Wood. Bo y- fa1- Shea) ond Bofld- mg Paper H in. * Resistance j--* 0.06 0.45 0.39: 1.04 1.32 2.06 ft Av. Materia) U 8 A U 0' ------- BC U 0 U0 F Drop--(1 in. x 8 Wood shingles in.-) 0.78 0.81 0.86* Gypsum lath @4 in.) and )4 in. pips. (It- wt. Gypsum lath (% in.) and )4 in. plas. (sand agg.)........................ .............................................. Metal lath and Ye in. plas. (It. wt. agg.). . Metal lath and Ye in. plas. (sand agg.)......... 0.57 O.SS 0.33 0.64 0.30 0.41 0.32 0.47 0.31 0.IS 0.35 0.47 0.29 0.27 0.28 0.2S 0.31 0.48 0.30 0.27 0.29 0.28 0.31 0.87 0.94 Insul. bd. 0 in.).................................................. 1-43 0.24 0.22 0.22 Insul. bd. lath 04 in ) and )4 in. plas. (sand agg.)....................................................................... 1.58 0.24 0.22 0.22 Face-brick veneer' 0-44 Plywood <$i in.) 0.47 .0.81 0.33 0.9i 0.27 Wood lath and )4 in- pl&s. (sand agg.)........ 0.40 0.32 Gvpsum bd. ($4 in.)....................... .................. Gypsum lath & in.) and V4 in- pl&$- (it. wt. Gypsum lath (% in.) and in. plas. (sand agg.)....................... ..................................................... _ 0.73 0.35 0.37 0.6. 0.33 OM 0.36 0.29 0.25 0.28 0.66 0.33 0.30 0.32 0.30 0.25 0.29 0.58 0.33 0.30 0.32 0.47 0.35 0.31 0.32 Metal lath and Ye in. plas. (sand agg.)......... 0.1S 0.40 0.35 0.36 Insul. bd. 04 in.).................................................. Insul. bd. lath 04 in.) and Y> in. plas. (sand Wood lath and >4 in- plas. (sand agg.)......... 1.41 l.Si O.S. 0.9. 0.4C 0.26 0.26 0.38 0.30 0.36 0.24 0.23 0.33 0.27 0.32 0.24 0.24 0.33 0.28 0.32 0.36 0.25 0.24 0.26 0.19 0.19 0.25 0.22 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 0.23 0.20 0.22 0.24 0.18 0.16 0.18 0.23 0.20 0.2( 0.18 0.23 0.19 0.38 0.30 0.25 0.21 0.2t 0.20 0.25 0.25 0.21 0.27 0.22 0.2( 0.17 0. H 0.17 0.26 0.21 0.22 0.19 0.25 0.21 Heat Transmission Coefficients of Building Materials 103 Table 5 .... Coefficients of Transmission (l/) of Frame Walls* (Concluded) Type of Sheathing* Number Exterior1 Material fts Av. Inferior Fistish Materia) None, Bead- gTP- p,v Wood. *W1D ' wrod ' ta- Insulation Boord Sheathing >4 Hu ?l0Hu mg Paper H . fteriftoace j--* 0.06 0.45 0.3? U UU ft . AB c 1.04 1.32 2.06 U UU 0F Wood shingles over insul.: backer bd. (Ji in.) 1.40 Asphalt insul. sid- mg 1.46 None.......................................................................... Gypsum bd. (% in.)............................................ Gypsum lath (g in.) and )4 in- plas. (It. wt. agg.)....................................................................... Gvpsum lath (Jfi in.) and >4 in. plas. (sand 1.48* Metal latb and Ye in. plas. (It. wt. agg.).. Metal lath and Ye in. plas. (sand agg.)........ Insul. bd. (M in.).................................................. Insul. bd. lath Os in.) and )4 in. plas. (sand agg-)- -................................................................. 0.43 0.82 0.28 0.64 0.25 0.41 0.27 0.47 0.27 0.18 0.29 1-48 0.21 1.58 0.21 0.37 0.38 0.25 0.25 0.23- 0.23 0.24 0.25 0.24 0.24 0-26 0.27 0.20 0.20 0.19 0.19 0.30 0.22 0.20 0.21 0.21 0.23 0.18 0.17 0.28 0.23 23 0.2C 0.1S 24 0.19 0.17 25 0.20 0.18 26 0.20 0.17 27 0.21 0.18 28 0.17 29 0.16 0.15 30 Asbestos-cement siding Stucco* 1 in. Asphalt roll siding PIvwood in.) Wood panels (J$ in.)............................................ Wood lath and )4 in. plas. (sand agg.)........ -- None.......................................................................... Gypsum bd. ($$ in.)............................................ Gypsum lath 04 in.) and H in. plas. (It. wt. Gypsum lath (% in.) and *4 in. plas. (sand 0.S1 0.28 0.94 0.24 0.40 0.27 -- 0.91 o.se 0.42 0.84 0.37 0.41 0.40 0.81 0.80 0.15 Metal lath and Ye in. plas. (It. wt. agg.) ...0.19* Metal lath and Ye in. plas. (sand astr.l........ Insul. bd. 04 in.).......................................... Insul. bd. lath 04 in.) and )4 in. plas. (sand agg.)....................................................................... 0.47 0.39 0.13 0.45 1.4S 0.29 1.58 .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. IS 31 0.18 0.16 32 0.20 0.18 33 0.42 0.32 34 0.27 0.23 35 0.25 36 0.27 0.22 37 0.26 0.22 38 0.29 0.24 39 0.21 0.18 to 0.21 0.18 41 Plywood 04 in.).................................................... o.st 0.42 0.36 0.37 ....................Wood panels iYe in.) 0.94 0.33 0.29 0.30 ....Wood lath and )4 in. plas. (sand agg.) 0.40 0.40 0.35 0.36 0.30 0.25 0.29 0.27 0.23 42 0.23 0.20 43 0.27 0.22 44 * See text section Cskiilstim Ovenll Coefficient! for bub of c&lculxtians. ' * To xdjust V vnloee for the effect of edited jimiiei-- between framing members, eee Table IS. * Note that although wveral types of exterior finish may be grouped became they hare approximately the --thermal resistance value, it is not implied that all types may be suitable for application over all typee of sheathing bated. * Average resistance of items listed. This average was used in computation of U values shown. * Building paper is not included except where noted. 1 Small air space between building paper and brick veneer neglected. * Where stucw b applied over insulating board or gyp-rum sheathing, building paper b generally required, but the change in U vmlim b negligible. -b Solution: In Fig. 5 the following paths of heat flow from plane A to plane F will be noted: 1. From A to B: One path through 3 in. of concrete. 2. From B to C: Two paths, (a) through 1 in. of tie rod, and (6) through l.in. of concrete. 3. From C to D: Two paths, (a) through 2)4 in. of tie rod, and (b) through 2)4 in. of insulation. 4. From D to B: Two paths, (a) through 1 in. of tie rod, and (6) through 1 ini of concrete. 5. From E to F: One path through 3 in. of concrete. It will be noted that items 2 and 4 are paths of similar flow, and* could be treated as one. If equilibrium or steady-state heat transfer is assumed, there will exist a temperature dif ference between the metal tie rod and the concrete, and also between the metal tie rod and the insulating material. The rate of heat transfer between these materials is dependent upon their conductivity values and the temperature difference. As the conductivity of the metal tie rods is considerably higher than that of the concrete or insulating material, it cannot be assumed that the same rate of heat transfer takes place for all parallel paths. Likewise, an appreciable error would be made by assuming that no heat transfer takes place between the metal lie rod and the surrounding materials. Although the pat tern of the isotherms is unknown, the following method of cal culation does partially take into account the heat flow between the metal tie rods and ite bounding materials. Parallel Flow. The conductances through the areas of parallel heat flow may be determined as follows: l.The area of each )4-ro. diameter tic rod is 0.00034 sq ft, and as the tie rods are spaced 9 in. vertically, and 12 in. hori-