Abstract
Thermal degradation of elastomeric roofing materials exposed outdoors was predicted. Temperature of urethane membranes set on concrete substrate and on insulation layer was monitored hourly for three years in Tsukuba, Japan and was estimated applying multi-regression equation of meteorological elements, ambient temperature, solar radiation and wind velocity. The ratio of elongation of EPDM+IIR roofing tested under high temperatures was expressed as power function of elapsed time combined with Arrhenius' model including temperature. Referring the database of calculated temperature of roofing around Japan for 1991-2000, the property change was simulated and plotted on maps.
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