How to install felt underlayment for a new roof. For decades roofers have fitted a layer of felt over a roof s sheathing or roof deck before installing shingles. Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe.
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