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Abstract
Wood fibers were substantied for asbestos fibers as reinforcing in cement fiber shingle products used a imitation roofing slate when governmental action outlawed the use of asbestos in this application. Our field experience with many installations of one brand of these new products, however, has been unsatisfactory. We have observed the rapid deterioration, often within two to three years, of shingles in service, primarily by the devleopment of extensive cracking. Our research finds that htese failures result from layering of the mortar materials during manufacture, combined with petrification and loss of ductility of the organic fibers. We suggest changes to the requirements of the applicable ASTM standard to help ensure that the product has the attributes necessary for satisfactory performance in service.
Wood fibers were substantied for asbestos fibers as reinforcing in cement fiber shingle products used a imitation roofing slate when governmental action outlawed the use of asbestos in this application. Our field experience with many installations of one brand of these new products, however, has been unsatisfactory. We have observed the rapid deterioration, often within two to three years, of shingles in service, primarily by the devleopment of extensive cracking. Our research finds that htese failures result from layering of the mortar materials during manufacture, combined with petrification and loss of ductility of the organic fibers. We suggest changes to the requirements of the applicable ASTM standard to help ensure that the product has the attributes necessary for satisfactory performance in service.
Date
0/1999
0/1999
Author(s)
W Gumpertz; S Condren
W Gumpertz; S Condren
Page(s)
93-111
93-111
Keyword(s)
asbestos; ASTM standard; carbonation; deterioration; fiber cement; slate; petrification
asbestos; ASTM standard; carbonation; deterioration; fiber cement; slate; petrification