Document 6BDKwpmp9YRE3OrBZepbByNk1

130 vCHAPTER 6 1946 Guide Table 8. Coefficients of Transmission.(CO of Brice and Stone Veneer Masonry Walls Hont. Transmission Coefficients of,Buildin.r>'Materials._____________________________ ' 1S1 Table 9. Coefficients of Transmission (U) of Frame Partitions or Interior Walls3 . Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on still air (no wind) conditions on both sides. Metal Loth and Piaster*............. ............ .......... Gypsum Board (M im) Decorated.................... Wood Loth and Piaster--------------------- Gypsum Lath (H m) Plastered*-------- 1-------- Plywood (H ") Decorated................. Insulating Board (H in.) Ram or Decorated... *_________f^tk rUC in \ Plfl.qtprpde SINGLE PARTITION (Finish on one side only of studs) A 0.69' 0.67 . 0.62 0.61 0.59 036 035 0.23 DOUBLE PARTITION (Finish on both sides of studs) NO INSOLATION BJSTWKJ5N STUDS 1 in. Blanket*1 BETWEEN STUDS. One aib space. ' aHs .3 Z. z0 E1 B 039 037 034 034 033 0.19 0.18 0.12 C 0.16 0.16 " 0.15 0.15 0.15 0.11 0.11 0.082 i 2 3 . 4- 5 6 .7 8 Coefficients not weighted; effect of studding neglected. Plaster assumed % in. thick. Plaster assumed H in- thick. *For partitions with other insulations between studs refer to Table 6. using values in Column B of above table in left hand column of Table 6. Example: What is the coefficient of transmission (U) of a partition consisting of gypsum lath and-plaster on both sides of studs with 2 in. blanket between stud.9? Solution: According to above table, this partition with no insulation between studs (No. 4B) has a coefficient of 0.34.. Referring to Table 6, it will be found that a wall having a coefficient of 0.34 with no insulation between studs, yill have a coefficient of 0.10 with 2 in. of blanket insulation between studs (No. 56B). 'Hollow concrete blocks.' ^Expanded slag, burned clay or pumice. Thickness of plaster assumed H in. /Thickness of-plaster assumed H InBased on 2 in. furring strips; one air space. ' ' ` ' ,. . " -' .. ' i Table 10. Coefficients of Transmission (U) of Masonry Partitions Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on still air (no wind) conditions on both sides. 0U TYPE OF PARTITION i & z fl s 5 E- TYPE OF FINISH No Finish (Plain walls) Plasteb One Side .A .B Plasteb Both ' Sides* C te a a p .z z E i' Cu. 3 030 4 0.45 0.47 .0.42 0.43 0.40 . 9 10 3 . 035 0.33 032 11 4 039 038 037 12 Hollow CONCBETE - Tilb'ob Blocks 3. Light Weight Aggregate*____ 3 4, 030 0.45 *0.41 035 . ` 0.47. 0.42 039 034 0.43 j 037 032 13 14 15 16 4. *2 in. solid plaster partition. If = 0.53. Expanded'slag, burned day or pumice. 030 . 0.46 0.43 17