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Glossary Residential Construction / Term

Underlayment

A ¼" material placed over the subfloor plywood sheeting and under finish coverings, such as vinyl flooring, to provide a smooth, even surface. Also a secondary roofing layer that is waterproof or water-resistant, installed on the roof deck and beneath shingles or other roof-finishing layer.

Permanent link Underlayment - Creation date 2021-03-05


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