Underlayment Underlayment (roofing felt) protects the roof decking before the finished roofing is applied. An underlayment is also laid before finished flooring, such as hardwood and resilient flooring, is installed.
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Underlayment (roofing felt) protects the roof decking before the finished roofing is applied. An underlayment is also laid before finished flooring, such as hardwood and resilient flooring, is installed.
