Document 3rKgEYd11qrJQk0p4aBNBN3E

t' - 1 *;. t. :i; I - ;i !| 200 1957 Guide Table 14A. Coefficients of Transmission (U) of Wood or Metal Construction Flat Roofs and Ceilings* Coefficient* are expressed in:-Btu per {how) {square foot) {Fahrenheit degree difference in temperatvrebetvxen the _ot'r on the two sides), and are based upon an outside-wind velocity of 16 m.p.h. _______________________ Example Example of Substitution Resistances used are' given below in Resistances used are given below in this table or in Table S-or 4* Construction Resistance (if) . (Heat flow up) 1. 2. 3. Outside surface (15 mph wind)............................... Built-up roofing. H in......... Roof insulation (C =* 0.72) / 0.17 0.S5 1.89 4. Wood deck (1 in.)................ 0.98 5. Air space1*............................... 6. Gypsum wall board in.) . 0.85 0.82 . 7. Acoustical tile (H in.)-- glued.................................. 1.19 this table or tn Table 8 or 4. Replace item 4 with 2 in. wood deck (exposed to inside) and - omit items 5, 6 and 7. Total resistance......................5.84 Deduct 41 Wood deck (1 in.)----0.98 5. Air space........................0.86 0. Gypsum wall board (H in.)....... ....................0.82 7. Acoustical tile ($4 in.) glued................... -- 1.19 8. Inside surface (still air) . . . 0.61 Total resistance. ;...............6.81 .. /= 1(R = 1/6.84...................0.17 -See value 0.17 in bold face type in table below. Resistance deducted... 5.34 Difference...................... 2.50 Add 4; Wood deck (2 in.)............ 8.03 Total resistance............. 4-53 To Adjust V Valueb for Construction with Added Insulation in Air Space See Table 16. Vb.c.d~see footnotes under Table 14B. Beat Transmission Coefficients of Building Materials 201 Table 14B. Coefficients of Transmission ({/) of Wood ob Metal Construction Flat Roofs and Ceilings* Coefficients are expressed in Btu per (hour) (square foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based upon an outside wind velocity of 7 mph. . .Example Example of Substitution Resistances used are gt'pen Mow in this table or in Tables 8 or 4. Construction Resistance (R) 1. Outside surface (7.5 mph wind)..........................................0.26 Resistances used are given below tn this table or tn Tables 5 or 4. Replace item 3 with roof insula tion (C = 0.36) and items 6 and 7 with metal lath and $4 in. 2. Built-up roofing-% in........... 0.88 plas. (It. wt. agg.) 3. Roof insulation (C = 0.24) .. 4.17 Total resistance......................7.OS 4. Metal deck................................. 0 Deduct 5. Airspace.................................. 1.28 3. Roof insulation (C " 6. Metallath and \,, 0.24).............................. 4.17 7. H in- plas. (sand agg.)/.......... 6. Metal lath and ] 8. Inside surface (still air)......... 0.92 7. Y* in. plas. (sand [ 0.18 Total resistance.....................7.08 agg.) ) ------ V = \/R = 1/7.03 =...........0-14 Resistance deducted... 4.80 See value 0.14 in bold face type in table below. Difference..................... 2.78 Add 3. Roof insulation (C = 0.36)............................. 2.78 6. Metal lath and \ 7. in. plas. (It. wt. | 0-47 agg.) )------ 8.26 Total resistance.............6.98 U = \fR = 1/5.98 = . . 0.17 To Adjust U Values for Construction with Added Insulation in Ajr Space, See Table 16. DIRECTION OF FLOW DOWNWARD FLOW (SUMMER CONDITIONS) TYPE OF CEILING Type or Deck Built-up Roof in All Cases Resistanci c. 1 Sand Agg. H in. Insulation Added on Top op Deck*1 Js Q gl-si Aa 83 o None Gypsum Bd. (H in. and Plas. Metal j'-" Lath and Plas. zs 2 .2 c .2 i. etaeb < tab tab < Jf 9a eO 3 CO 3 _UO 0C03 c* w 2 Sc .2 a 8 3.5<l Acoustical Tile On Furring On Gyp sum Bd.- (H in.) a ad &X& 1 0.62 0.64 0.41 0.47 1.47 1.19 1.78 1.61 2.10 Material R C R U U V U U U -u U U ' U V Wood* 1 in. Wood* 2 in. ------- - "W* 3 in. --____ 0.98 None 0.72 0.36 0.24 0.19 0.15 0.12 2.08 None 0.72 0.36 0.24 0.19 0.15 0.12 8.28 None 0.72 0.36 0.24 0.19 0.15 0.12 _ 1.89 2.78 4.17 6.26 6.67 8.88 _ 1.89 2.78 4-17 6.26 6.87 8.88 _ 1.89 2.78 4.17 6.26 6.67 8.88 0.40 0.26 0.19 0.15 0.13 0.11 0.09 0.28 0.20 0.16 0.13 0.11 0.10 0.08 0.21 0.16 0.13 0.11 0.10 0.09 0.08 0.25 0.18 0.15 0.12 0.11 0.09 0.08 0.23J 0.24 0.17 0.18 0.14 0.14 0.12 0.12 0.10 0.11 0.09 0.09 0.08 0.08 0.20 0.15 0.13 0.11 0.10 0.09 0.07 0.19 0.15 0.12 0.10 0.07 0.08 0.07 0.10 0.15 0.13 0.11 0.10 0.08 0.07 0.16 0.13 0.11 0.10 0.09 0.08 0.07 0.15 0.12 .0.11 0.09 0.08 0.08 0.07 0.16 0.13 0.11 0.09 0.09 0.08 0.07 0.24 0.26 0.19 0.18 0.19 0.15 0.14 0.15 0.13 0.12 0.12 0.11 0.11 0.11 0.10 0.09 ft. 10 0.08 0.08 0.08 0.07 0.19 0.20 0.16 0.15 0.16 0.13 0.12 0.13 0.11 0.11 0.11 0.10 0.10 0.10 0.09 0.08 0.09 0.08 0.07 0.08 0.07 0.15 0.16 0.13 0.13 0.13 0.11 o.n 0.11 0.10 0.09 0.10 0.09 0.09 0.09 0.08 0.08 0.08 0.07 0.07 0.07 0.06 0.20 0.18 0.19 0.17 0.16 0.15 0.15 0.14 0.13 0.12 0.13 0.12 0.11 0.10 o.n 0.10 0.10 0.09 0.10 0.09 0.09 0.08 0 08 0.08 0.08 0.07 0.07 0.07 0.17 0.15 0.16 0.15 0.14 0.13 0.13 0.12 0.11 0.11 o.n 0.10 0.10 0.09 0.10 0.09 0.09 0.08 0.09 0.08 0.08 0.08 0.08 0.07 0.07 0.07 0.07 0.07 0.14 0.13 0.13 0.12 0.12 0.11 0.11 0.11 0.10 0.09 0.10 0.09 0.09 0.08 0.09 0.08 0.08 0.08 0.08 0.0/ 0.07 0.07 0.07 0.07 0.06 0.06 0.06 0.09