Whether you envision your house's top floor as an away-from-it-all master suite, a quiet home office, or a hangout spot for the kids, don't lift a finger until you've read TOH's expert advice
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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