Document dYoB3YbLzywQB2B6qDOpNJZ36

190 CHAPTER 9 1954 Guide Table 10. .Coefficients of Transmission (t/) of Frame Partitions or Interior Walls" Coefficients are expressed in Blu per (hour) {square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based on stiU air (no wind) conditions on both sides. INTERIOR FINISH Irtrrtorfi 'ff 0 Ij SINGLE PARTITION (Finish on one ride only of studs) DOUBLE PARTITION (Finish on both sides of studs) NO INSULATION BETWEEN BTCDS 1 in. Blanket- between ottos. One ais space. ABC 0.69 059 0.16 Qynsmn Board (44 in.) Decorated.. 0.67 057 0.16 Wood Lath and Piaster____ 0.62 054 0.15 Gypeum Lath (34 in.) Plastered*-i----------------------- 0.61 054 0.15 Plywood (H in.) Plain or Decorated..... _ 0.59 053 0.15 o.nInsulating Board 04 in.) Plain or Decorated....____ 056 0.19 Insulating Board Lath O^ In.) Plastered*_______ __ 0.35 0.18 0.1] Insulating Board Lath (1 in.) Plastered*___,______ 0.23 0J2 0.082 a J Xo E g a<. 1 2 3 A S 6 7 8 (See text p. 183.) 1 Coefficients not weighted; effect of studding neglected. } . 6 Plaster assumed 3 in. thick.. ' .j c Plaster assumed \ 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 studs? Solution; '*; According to above table, this partition with no insulation between studs (No. 4B) has a coefficient of 0.34. 4 Referring to Table 6, it will be found that a wall bavins a coefficient of 0.34 with no insulation between studs. >! will have a coefficient of 0.10 with 2 in. of blanket insulation between studs (No. 56B). _ Table 11. Coefficients of Transmission (V) of Masonry Partitions