Document 9JxXppRXrVVjg5J590OMv3KGp

202 CHAPTER'9 ' 1951 Guide Table 18. Combined Coefficients of Transmission ({/) of Pitched Roofs" and Horizontal Ceilings--Based on Ceiling Area6 Coefficient* are expreseed in Btu per {hour) (square foot of ceiling area) (Fahrenheit degree difference in temperature between the air on the two sides), and ere based on an outside wind velocity of 16 mph. TYPE 0? ROOFING AND ROOF SHEATHING CHUNG (SENT/ (From Wood Shctoms on Wood Strips* Asphalt Shihules* or Roll Booitkq on Wood Sheathiho* No Hoof Irwnlfttinn (Baftezs Rmnsed) (Ur - 048) fating Board on Under bide of Bafters (Ur - 002) 1 In. Insolating Board on Under Side of Bafters (Ur - 016) No Hoof Inwilatinn (Bafters Kmwwtt (Ur - 053) Ufa. Iranfating Board on Under Side of Bafters (Ur " 0X3) 1 In. Inso- fating Board on Under Side of Bafters (Ur - 047) F % 0l10 QJ1 <U2 4US 014 A 0085 0092 0099 Oil on B 0.073 0078 0.082 0087 0091 C 0.066 0.07 0.074 0.078 0.081 D 0X87 0X94 OlO OH 041 E. 0074 0X79 0X83 0088 0X93 F 0067 0X71 0X75 0X79 0X83 19 20 21 22 23 015 OlO 017 018 019 012 018 018 014 014 0099 OlO OlO ' OH Oil 0X84 0087 0X90 0X93 0X95 042 043 . 043 014 045 0X97 OlO OlO Oil Oil 0X86 0X89 0X92 0095 0X93 24 25 28 27 28 020 021 092 083 024 005 015 016 0J6 017 0J1 QJ2 0J2 012 013 0X98 OlO OlO 040 Oil 015 016 017 017 018 012 012 012 042 013 OlO 040 Oil 041 0.11 29 30 81 82 33 025 029 027 028 029 017 018 018 019 019 018 018 013 014 014 041 Oil Oil 042 012 018 019 019 019 020 013 043 013 014 044 Oil 041 042 012 042 34 85 38 37 38 080 020 014 012 020 014 042 39 084 001 015 042 0X2 015 0.13 40 085 002 015 013 0X2 045 043 41 OS9 002 015 013 0X3 015 0.18 42 087 023 015 . 043 023 046 018 43 045 059 061 062 067 059 025 009 009 000 001 001 047 018 018 019 019 019 043 014 015 045 0.15 015 0X6 \ 0J0 0X1 0X1 0X3 0X3 017 049 019 019 0X0 0X0 044 015 045 016 046 046 44 45 40 47 48 49 * Calculations based on X pitch roof (n = 1.2) using the following formula: UT X Uct u" U Ut + n U = combined coefficient to be used with ceiling area. Ur d coefficient of transmission of the roof. Uoe 0 coefficient of transmission of the ceiling. no the ratio of the area of the roof to the area of the ceiling. * Use ceiling area (not roof area)' with these coefficients. 6 Coefficients in Columns D, B and F may be used with sufficient accuracy for tile, slate and rigid as bestos shingles on wood sheathing. d Based on 1 z 4 in. strips spaced 2 in. apart. 4 Sheathing assumed If in. thick. / Values .of Uos to be used in this column may be selected! torn Table 12. Q - "i a Heat Transmission Coefficients of Building-Materials 203 Table 19. Coefficients of Transmission (f7) of Solid Wood Doors Coefficient! on 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 16 mph. Nominal Thickness Inches i u if U 2 2i 3 Actual Thickness Inches a i*. 1A if if 2f 2f Ua`b Exposed Door 0.69 0.59 0.52 0.51 0.46 0.38 0.33 u*.b With Glass Storm Door0 0.35 0.32 0.30 0.30 0.28 0.25 0.23 Computed using k = 1-15 for wood; / -- 1.65, fo = 6X and 1JO for air space. b A U value of 0.85 may be used for single exposed doors containing thin wood panels or single panes of glass, and 0.39 for the same with glass storm doors, e 50 percent glass and thin wood panels. Table 20. Coefficients of Transmission ({/) of Windows, Skylights and Glass Block Walls Coefficient, are expreseed sn Btu per (hour) (equare foot) (Fahrenheit degree difference in temperature between the air on the two sides), and are based upon the following outdoor conditions: 0 F air temperature, clear skies, no solar radiation Section A--Vertical Glass Sheets Number op Sheets One Two Three Air Space, inches............................ None U............................. 1.13 X 0.61 X 0.55 1 0.5* i X 0.41 - X 0.36 "1 0.34 Section B--Horizontal Glass Sheets (heat flow up) / Number op Sheets One Two Air Space, inches--...................... U............................. None 1.40 Ye 0.70 H 0.66 1* 0.63 Section C--Walla op Hollow Glass Bloch Description U 7} x 7} x 3f in. thick with glass fiber screen dividing the cavity........... ........ y........... Section D--Approximate Application Factors for Windowb Multiply Flat Glass U Values by These Factors 0 60 0^56 0.48 Window Description Single Glass Percent* Glass Factor Double Glass* Percent* Glass Factor Windows with Storm Sash* Percent* Glass Factor ' Sheets............................................... 100 1.00 100 1.00 Wood Sash....................................... Wood Sash...................................... 80 60 0.90 0.80 80 60 0.95 0.85 80 GO 0.90 lioo* <Metal Sash...................................... 80 1.00 ^ 80 1.20 80 For 1 in. or greater. * Unit type double glazing (two lights or panes in same opening). * Use with U values for two sheets with 1 in. air space. Based on area of exposed portion of sash; does not include frame or portions of sssh concealed by frame. * For metal storm sash or metal sash with attached storm pane.