Forum Title: Has the NRCA gone mad?
NRCA's Associate Director of Technical Services Mark S. Graham states: ?The NRCA belI'ves too much emphasis is placed on maufacturers? exact fastener placement locations.? Now get this: Also, research has shown- and a number of shingle manufacturers agree- once self-sealing asphalt shingles have sealed, fastener placement has little effect on asphalt shingles wind resistance and overall performance. He went on to mention reasonable variances to manufacturers tolerances being acceptable without stating what reasonable is. This all in the ?Letters? column on page 10 of this months Professional Roofing mag. I will save my comments for later.
Category: Roofing Post By: KATHERINE ROGERS (Topeka, KS), 03/03/2018

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