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Methods were developed to measure the exposed area of bitumen on a granule-covered roofing surface. They included traverse microscopical examination, image analysis technique, and photometric measurements. Three specially prepared samples were tested for granule coverage. One of the samples was further tested for the exposed area of bitumen after progressively removing granules from its surface. The study showed that the exposure of bitumen could be related to the loss of granules.
Research ScientistMember of ASTM, Division of Building Research, National Research Council of Canada, Ottawa, Ontario
Stock #: JTE11398J