Thermal-shock Resistance for Built-up MembranesU.S. Department of Commerce, National Bureau of Standards, 1967 - 13 pages The resistance of bituminous built-up roofing membranes to thermally induced forces is considered in terms of their strength properties such as breaking load in tension, modulus of elongation and apparent linear thermal expansion coefficient.The development of a Thermal-Shock Resistance Factor is described and values are given for three bituminous built-up membranes at temperatures of - 30F (-34.4C), 0F (-17.8C), 30F (-1.1C) and 73F (22.8C).The apparent relation between the values obtained in the laboratory and the observed performance of roofing membranes in service is considered.The utilization of the Thermal-Shock Resistance Factor in the reduction of potential failures of bituminous built-up roofing membranes in service from thermally induced forces is also discussed.(Author). |
Common terms and phrases
adhesive anisotropic Apparent Linear Thermal ASPHALT SATURATED asphalt-sat Average of three bituminous built-up membranes brane Breaking load Building Research Institute Building Science Series built-up roofing membrane Bureau of Standards coal-tar Coal-tar-pitch coal-tar-sat coeffi coefficient of linear deviation among replicates dumbbell-shaped elasticity Elongation modulus F Membrane four-ply built-up initial tangent kg/cm² L-Longitudinal with machine laboratory lb/in see footnote linear thermal expansion Load-Strain Properties mbrane membrane exposed membrane in service membrane placed Modulus of elasticity modulus of elongation National Bureau NBS Mono number of plies obtained Owens-Corning Fiberglas Corporation plies of felt predicting the ability Properties of bituminous reinforcing felt reported roofing felt roofs exposed saturated organic felt service conditions shear strength Shock Resistance Factors side of eq splitting failures standard deviation substrate T-Transverse across machine Temperature Range 30 tension splits test specimen thermal expansion coefficient Thermal-Shock Resistance Factor thermally induced forces three specimens U.S. Navy W. C. Cullen
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Page 9 - Koike [77] and those reported in this paper support the validity of some suggestions made by Cullen [10] regarding the alteration of some conventional application techniques to reduce the incidence of splitting failures resulting from mechanically and thermally induced forces, such as: (a) the placement of the insulation boards with their long dimension parallel to the short dimension of the roof, (b) the orientation of the roofing felt parallel to the long dimension of the roof, and (c) the use...