spray-foam roof insulation applied to this refinished attic
Photo: Courtesy of Certainteed Corporation
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Splurge on Spray-Foam Roof Insulation

It costs two to three times more than fiberglass batt insulation. But the roof is a major pathway to heat loss—and gain—so it's worth shelling out the extra bucks for spray foam. It forms a much tighter air barrier, and you'll get the same R-value with fewer inches of the stuff, so you'll have extra room overhead.
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