Document NEJREwpq069vaz1gVx4VR3jgp

HEATING VENTILATING AIR CONDITIONING GUIDE 1944 Table 14. Coefficients of Transmission (U) of Flat Roofs Covered with Built-up Roofing. With Lath and Plaster Ceilings3' (See Table 13 for Flat Roofs, with no Ceilings) These coefficients are expressed in Btu per hour per square foot per degree Fahrenheit difference in temperature between the atr on the two sides, and are, based on an outside wind velocity of 15 mfih. TYPE OF ROOF DECK Roof Deck (Inches) No Insula tion INSULATION ON TOP OF DECK . (Covered with Built-Up Roofing) Insclatinq Board (Thickness Below) CORKBOABD (Thickness Below) M In. 1 In. 1M In- 1H In. Flat Metal Roof Deck tnjouT ion, RPQTMK <?a / m VtI ..........1 0.19 0.11 Precast Cement Tile RetFiNtf. /?alI '^t/vrtoxTsJr . ctn-mc' 1M in. Concrete lN/OLATtOM; R-OCFlfla^ ^ / 2 in. 4 in. cetunfi/ Gypsum and Wood Fiber* on'H in. Gypsum Board 2in/ULAtlO, t-lDFiHG, Cirjif :*.***: PLA/TpR. btk\L9' 2H in. 3Him 0.26 0.19 0.42 0.26 0.19 0.15 0.12 0.18 0J4 0.11 0.40 0.25 0.18 0.14 0.12 0.17 0.13 0.11 0.37 0.24 0.18 0:14 0.11 0.17 0.13 0.11 0.27 0.23 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.14 0.097 0.13 0.12 0.11 0.097 0.091 Wood* ROOFirf^j 1 in. 1M in. 2 in. 3 in. 0.21 0.16 0.13 0.11 0.15 0.12 0.10 0.26 o54 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.14 0.097 0.13 0.11 0.11 0.095 0.092 0.18 0.14 0.12 0.10 0.087 0.11 .. basfd n metal lath and plaster ceilings, but coefficients may be used with sufficient accuracy for gypsum lath or wood lath and plaster ceilings. It is assumed that there is an air space between ^ the under side of the roof deck and the upper side of the ceiling. `87K per cent gypsum, 12K per cent wood fiber. Thickness indicated includes' H in. gypsum board. Nominal thicknesses specified- -actual thicknesses use(i in calculations. 112 T able 15. Coefficients of T ransmission U) of Pitched Roofs -( Coefficients are expressed in B tu between the a ir 'on per hour per the two sides square foot Per degree Fahrenheit and are based on a w in d velocity doifff1er5enmcpeh.in temperature CHAPTER 4. HEAT TRANSMISSION COEFFICIENTS 3o EF-gii*g. S9B 5a5 j & tt*5 1 a| o "3 gs zo| ESS S! gqO <P5 a| al3 o a Z gi P!'*1 O C~> *Si *o ?s o *5 . as Wo OP w 52522323 0000 CONSO -- *-<oo 0000 ow-d0> 0o)0co OOOO laiQioio OOOO VWINO OOOO eP wt* !M 4 CO CO CC 0000 SC4C4* OO OO CO OOOO 4e5- OOOO esscsos OOOO OOOO OOOO OOOO -1> C4 C4 OOOO NMOQ sssi OOOO oeoefoiNNHS OOOO SSSRS 0000 OOOO 8 g -8 OOOO C4 C4 OOOO ONCNBCCJCH OOOO 'B::&ofei S&Ife Zd.; . 2|s -33-3 . uJ " *5 (3 ** E8 g-J I 1 A< > 5 ^ _L t g J C c ^ .1 8 S S*^ ill! i I III @1 3||i sjtJ S-S 111< e# 3s.3e. . oOeScC CCB . S'SS'S2 fc jj - g o cl 1*0 |l|iO ?3ag y fc.cn Z Eoio slU-E 113