A. Bob Werner, applications sales specialist at CertainTeed Corp., responds: The installation of asphalt felt as a weather barrier under vinyl siding has been common for years and is approved by the Vinyl Siding Institute’s installation guide. I have never heard of any compatibility problems between the two products. During my years as an installer, going back to the late 1970s, I installed vinyl siding over asphalt felt on at least 400 houses and have never heard of any problems arising from the use of felt under vinyl.

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