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Roof Saver. Surround SR Underlayment is a waterproof synthetic polymer that’s 40 percent lighter than 30-pound roofing felt — as well as more durable and slip-resistant and less prone to tearing, says the maker. It’s unaffected by moisture and has a reflective surface that reduces heat buildup on the roof. According to the company, a 45.25-inch-by-267-foot roll covers 10 squares; the manufacturer declined to provide pricing. Fiberweb, 615/847-7000, surroundtypar.com