Document rpdvBn5wZeNXwg7qpNVJnMNMJ

114 Am. Soc. of Heat.-Vent. Engineers Guide, 1922 FOR ROOFING PURPOSES Sheet iron..................................................................................................................... Corrugated iron.......................................................................................................... Slate on'"wooden framing......................................................................................... Slate on 1" boards..................................................................................................... 2" boards, paper, tar and grave!....................................... ......................................... Patent tar, gravel and paper.................................................................................... Tiling 1" thick or less.......................................................................... ................ 6" hollow tile covered with 2" concrete, tar and gravel................................... 2" concrete with cinder fill .................................................................................... 4" " " " " ........................................................................................ 6" " " " " ...................................................................................... 1.20 1.50 0.85 0.43 0.26 0.30 0.80 0.35 0.80 0.60 0.54 L. A. .Harding submitted to the Society, in 1913, a paper entitled: Heat Losses by Transmission Through Various Building Materials (see Vol. 19 of the Transactions), from which the following table is repro duced. The data was calculated by the author and checked by experiments which reproduced the conditions existing in buildings. Tests by John R. Allen (see Vol. 22, Transactions, p. 507) on the transmission through glass under weather conditions suggest a constant of 1.2 for single windows. *1 Am. Soc. of Heat.-Vent. Engineers Guide, 1922 II5