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ROCKWOOL ComfortBatt R15 is a stone wool batt for 2x4 exterior walls, sized 15.25 in. wide by 47 in. long by 3.5 in. thick, with 59.7 sq ft of coverage per package. Stone wool is denser than fiberglass, so it holds its shape in the cavity, resists moisture and mold, and damps sound better. It cuts cleanly with a serrated blade and friction-fits between studs. It suits DIYers and contractors insulating or soundproofing exterior walls; fiberglass batts cost less and are lighter, but stone wool is more durable and easier to fit tightly.
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Owners and contractors praise ComfortBatt for fitting snugly, cutting easily and quieting rooms noticeably compared with fiberglass. Complaints center on weight, itch and the higher cost per bag.
Rockwool ComfortBatt is an unfaced insulation batt with an R-value of R15. It is sold as a batt rather than a roll and is intended for use in exterior walls.
Each batt is 15.25 inches wide, 47 inches long and 3.5 inches thick. One package covers 59.7 square feet.
