Granule embedment on shingles and roofing membranes

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AuthorSearch for:
Journal titleJournal of Testing and Evaluation
Pages322327; # of pages: 6
SubjectRoofing; gravel; adhesion; bituminous roofings; granule adhesion; bituminous surface; modified bituminous membrane; roofing granules; standards; scrub test; shingles; slag granules; slate granules; Roofs; Roofs; Couvertures; gravier; adhérence; couverture bitumineuse
AbstractSamples of shingles and modified bituminous membranes covered with stone, slag or slate granules were tested for the amount of granules applied and the coverage provided to the bitumen. The granule embedment in the as-received condition and afterwetting was measured by scrubbing the samples with 50 strokes of a steel wire brush. Five representative samples out of the thirteen were also subjected to an extended scrub test, where the number of scrub strokes was increased to 150 (in intervals)to evaluate the retention. The results showed significant variations between samples. The requirement of a fixed amount of granule loss exists in most standards. Although this is adequate for quality control, the loss should be proportional to thequantity of granules applied, rather than a fixed amount. Proper assessment of granule adhesion requires testing for wet granule loss, for the initial granule coverage and for the tendency for granules to detach under extended scrubbing.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number29216
NPARC number20378547
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Record identifierae62654a-9c76-46b2-90e0-b84f3949a925
Record created2012-07-24
Record modified2016-05-09
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