Roof Underlayment • What It Is, Types, Purpose, and More
https://roofonline.com/roof-underlayment/
WEBApr 15, 2023 · The primary purpose of underlayment is to provide a secondary or back-up layer of protection over the life of the roof, acting as a barrier against moisture and preventing damage to the roof decking ( or sheathing) due to wind-driven rain, ice dams, wind-damaged roofing materials (missing shingles), etc.
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