Our firm has been involved in testing shingles on numerous
projects throughout the U.S. On several occasions, we have observed
shingles that do not meet ASTM International standards listed on
the package and in marketing literature. Failure to meet these
standards can obviously affect roof system performance. To be on
the safe side, roofing contractors should require verification from
Jim D. Koontz, PE, RRC
Jim Koontz & Associates...
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