| 摘要 |
A roofing underlayment that includes at least two layers that form a weather resistant barrier between the plywood sheeting and the top roofing layer. The roofing underlayment is fastened to the plywood sheeting and is covered with a roofing material such as shingles. The roofing underlayment is synthetic and includes a polymer is that is extruded or laminated to a woven or non-woven substrate. The use of an extruded polymer provides water proofing, strength, and energy efficiency. The roofing underlayment is embossed by use of an embossment process to allow for trapped water vapor escape and to enhance traction of the roofing surface.
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