SIMPLIFIED DETERIORATION EVALUATION METHOD FOR ROOFING SHEETS MADE FROM POLYVINYL CHLORIDE

Abstract

A simplified method to estimate the degree of deterioration of roofing sheets was developed, and discussed using Barcol hardness, crazing area and average crazing width. The elongation rate during tensile test and breaking energy which have been used for estimating the deterioration of the sheets were highly correlated with the value from the combined testing of hardness and surface characteristics. This newly developed method was proven to be an effective nondestructive technique to evaluate the degree of deterioration of the sheets on-site.