This past winter at one of the craft fairs in LSL one of the solar fan people was also promoting attic radiant barrier systems. I asked them what effect redirecting all of that radiant heat back to the roof would ultimately have on the roof decking and roof shingles. I asked a local contractor the same question this week in NY who was also promoting a radiant barrier system. Everyone says it's an excellent question but no one has an answer. I think the Owens Corning and Certainteed people who make the foil system should know but could you trust their test results when they sell the product. We know 25 yr roofs in FL last only 15 years on average. Would adding additional solar heat to the underside of the roof reduce the life of the roof by another 5 years?
George
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