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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 -30 F (-34.4 C), 0 F (-17.8 C), 30 F (-1.1 C), and 73 F (22.8 C). 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.
roofing, bitumens, thermal shock, thermal stresses
Cullen, W. C.
Assistant chiefPersonal member ASTM, Nat. Bureau of Standards, Washington, D. C.
Boone, T. H.
TechnologistPersonal member ASTM, Nat. Bureau of Standards, Washington, D. C.