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192 CHAPTER 9 1958 Guide Table 10. Coefficients of Transmission (U) of Masonry Partitions* Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference tn temperature between the air on the two sides), and are based on stiii air (no wind) conditions on both sides. Example Resistances usea are given below in this . table or tn Table 3 or 4- Construction. Resistance (R) 1. Inside surface (still air)................ 0.68 2. PIas. (It. wt. agg.) 54 in................ 0.39 3. Cement- -block (cinder agg.) (4 in.)...................................... l.ll 4. Plas. (It. wt. agg.) 54 in.............. 0.39 5. Inside surface (still air)............. 0.68 Total resistance........................ 3.95 [/ = 1/R = 1/S.35 = ........0.31 See value 0.31 in bold face type in table below Example of Substitution - Resistances used are given below in this table or tn Table 3 or 4. Replace item 3 with gypsum tile (4 in.) Total resistance......................... S.tS Deduct 3. Cement block (cinder agg.) (4 in.).................................. 1.11 Difference.............................t.li Add 3. Gypsum tile (4 in.)............ 1.67 Total resistance..................3.81 U = l/R == 1/3.3/................0.26 Surface Finish v Type op Partition Plas. (Lt. Wt. Agg.) 54 in." - "Plas. (Sand Agg.) 54 in. One side Two sides One side Two sides 0.39 0.78 0.11 0.22 Material R UU UUU Hollow concrete block (Cinder agg.) (3 in.).............................................- (12in.)......................................................... 0.86 1.11 1.72 1.89 (Lt. wt. agg.) . (8 in.).................................................. . (12 in.)........................................................ 1.97 ' 1.60 2.00 2.27 (Gravel agg.) (12 in.)......................................................... 1.11 1.28 Hollow clay tile (3 in.)...........1........... ................................. (8 in.).... --......... .............................................. 0.80 1.11 1.69 1.86 Hollow gypsum tile (3 in.)................................................................................. (4 in.).............................................................................. 1.35 1.67 H in. Solid plaster walls'. t Gypsum lath (J-4 in.) and plas. 54 in. each side (Lt.'wt. agg.)........ ................................................ (Sand agg.)..................................................... 1 in. each side (Lt. wt. agg.)................................. -- (Sand agg.)........................ .............. ................. 1.39 . 0.71 1.73 0.81 Metal lath and plas.b 2 in. total thickness (Lt. wt. agg.)......................................................... (Sand agg.).......... ............................................ 2Yi in. total.thickness (Lt.- wt. agg.)......................................................... (Sand agg.).......... ......... ........... 1.98 0.36' 1.60 0.46 Glass and glass blocks.. --........... 0.45 0.40 0.32 0.31 . 0.38 0-35 0.29 0.27 0.33 0.31 0.26 0.25 0.43 0.39 0.31 0.30 . 0.41 0.37 0.30 .' 0.29 0.38 0.35 0.30 0.28 0.33 1 0.31 0.27 0.25 .0.30 ' 0.27 0.24 0.23 0.36 0.34 0.29 0.27 0-35..'' 0.32 u 0.28 4 0.26 0.40 0.35 0.31 0.39 .0.37 .1 0.38 0.33 0.29 0.36 `0.35 0.46 0.40 0.35 0.31 0.39 0.35 0.31 0.28 0.34 0.31 0.27 0.25 0.44 -. Q.42.;< 0.39 ' 0-37 0.33. - .0.32 0.30 0.29 , 0.37 0.33 0.32 0.29 0.36 0.48 0.32. 0.46 -- _ -- 0.29 0.35 0.26 0.32 --. -- . __ -- 0.34 0.31 ill lls -- .It- -it .0.38 0.58 0.340.55 ---- '__ -__ ---- See Table 20 --- __ -- -- *4. ---"1; * See text section Calculating Overall Coefficients'for basis of calculations. b Metal core and supports disregarded. Plaster troweled smooth both sides. Heat Transmission Coefficients of Building Materials 193 Table 11. Coefficients of Transmission ({/) of Frame Construction Ceilings and Floors" Coefficients are expressed in Bln per (hour) (square fool) (Fahrenheit deqree difference between the air on the two sides) and are based on still air (no wind) conditions on both sides. Example Resistances used are given below in this table or in Tables S or 4- Heated room above unheated space Construction Resistance (R) (Heat Sow down) 1. Top surface (still air)..........0.9S 2. Linoleum or tile (av.R). ... 0.06 3. Felt........................................... 0.06 4. Plywood (54 in.)..................... 0.78 5. Wood subfloor (2%* in.)___0.98 6. Air space1* (7)4 in.).............. 1.36 7. Metal lath and ^ in. plas. flt. wt. agg.)............................ 0.47 8. Bottom surface (still air)... 0.92 Total resistance...................6.43 U = l/R = 1/6.43 =......... 0.18 See value 0.18 in bold face type in table below. Example of Substitution Resistances used are given below in this table or in Tables 3 or 4. Assume heated room is below un heated space so heat flow is up. Total resistance..................... 6.43 Deduct 1. Top surface (heat flow down)............................... 0.92 3. Air space (heat flow down)............................... 1.62 8. Bottom surface (heat flow down)............................... 0.92 Resistance deducted............... 3.09 Difference..................................2.34 Add 1. Top surface (heat flow up)...................................... 0.61 3. Air space(heat flow up) 0.86 8. Bottom surface (heat flow up).................................... 0.61 Resistance added......................3.07 To Adjust U values for Construction with Added Total resistance........................ Tm Insulation between Framing Members, See Table 16. u = UR = 1/4.41=.........' Direction op Heat Heat Flow Upward (Winter Conditions) Heat Flow Downward (Summer Conditions) Type op Floor Wood subploor (256a in.), Felt, anu Wood subploor (% IN.) Felt, and- Type op Ceiling S.s- 25 sa Js Resistance . s' --r.5 e o X1 9X ea a 8o 3 O 0c o'~ a. 1.38 2.26 gaS* 8P 2a -t W u Ph I 1.72 1.87 2.28 Material None. Gypsum bd. (56 in.). ^ggO h<%in) and in. plas. (It. wt. ^*yiagg1) k**1 ^ in*^ an<* H in. pias. (sand 0.32 0.64 U 0.45 0.38 0.34 0.31 0.28 0.35 0.31 0.28 0.26 0.24 0.65 0.30 0.27 0.24 0.23 0.21 0.46 0.23 0.21 0.20 0.18 0.17 0.54 0.24 0.23 0.20 0:40 0.21 0.20 .018 0.17 0.16 mJ and ^ 0.41 0.61 0.29 0.26 0.24 0.22 0.21 0.44 0.22 0.21 0.19 0.18 0.17 0.47 0.59 0.28 0.26 0.23 0.22 0.20 0.43 0.22 0.20 0.19 0.18 0.17 0.13 0.74 0.31 0.28 0.26 0.24 0.22 0.51 0.24 0.22 0.20 0.19 0.18 plas fean<i *"j 1.43 1.62 0__ V0.A.2,A2,V0..A20,,,W0..A1,9V.0A.1O8V0.A.1,7 0.31 0.18 0.17 0.16 0.15 0.15 0.36 0.22 0.20 0.19 0.18 0.17 0.30 0.18 0.17 0.16 0.15 0.14 (in>.............. !^la`hand H iu. plmu'tsand agg.) 1.51* 0.37 0.22 0.20 0.19 0.18 0.17 0.30 0.18 0.17 0.16 0.15 0.14 1.19 0.41 0.24 0.22 0.20 0.19 0.18 0.33 0.19 0.18 0.17 0.16 0.15 *. ltF 0.30 0.19 0.18 0.17 0.16 0.15 0.25 0.16 0.15 0.15 0.14 0.13 ' 0.330.21 0.190.180.17 0.160.28 0.17 0.16 0.15 0.15 0.14 0.62 0.29 0.26 0.24 0.22 0.21 0.45 0.22 0.21 0.19 0.18 0.17 calculations. vuv \/Q AAA./, LGIAiiUV 54 in. gypsum wall board. or terrazo (1 in.).