August 2007

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Verify shingle compliance

The article "Asphalt shingle selection," May issue, page 28, is excellent. As an overall comment, roofing contractors should require manufacturers to provide certification that their products meet designated ASTM International and Underwriters Laboratories Inc. standards.

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 manufacturers.

Jim D. Koontz, PE, RRC
Jim Koontz & Associates...

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