Document kDJ4Jj6OO2jnG6vaLBBrMKE3n

Heat Tra^fflissin Coefficients of Building Materials 141 r,,MBINED COEFFICIENTS,OF TRANSMISSION (10 OF PITCHED ROOFS" AND Tabus 17. {Iorizontal Ceilings--Based on Ceiling Area1 a Calculations based on 1 pitch roof' (n = .1.2) using the following formula: - Ur X ` Uc9 U = ----------jj-- Ur 4- --^ n U *= combined coefficient to be used with ceiling area. ur = coefficient of transmission of the roof. C/e* -- coefficient of transmission of the ceiling. n = the ratio of the area of the roof to the area of the ceiling. ^ Use ceiling area (not roof area) with these coefficients. . Coefficients in Columns D, E and F may be used with sufficient accuracy for tile, slate and rigid as bestos shingles on wood sheathing. d Based on 1 x 4 in.-strips spaced 2 in. apart. * Sheatiling assumed if in. thick. / Values of C/m to be in this column may be selected from Table 11.