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ROCKWOOL ComfortBatt R-30 is semi-rigid stone wool batt insulation for 16-inch on-center wood framing, sized 7.25 x 15.25 x 47 inches at about 29.86 sq ft per bag. It is built for deep cavities: attics, cathedral ceilings and other spaces that can take a 7.25-inch batt, not shallow 2x4 walls. Its edge over fiberglass is fire performance and moisture tolerance: it is noncombustible per ASTM E136 and rates 0/0 flame and smoke per ASTM E84. It is denser and stiffer than fiberglass batts, so it holds its shape in a cavity and cuts cleanly, but it costs more and is heavier to handle.
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Owners and installers of ROCKWOOL ComfortBatt generally rate it highly for stiffness, easy cutting and fire and moisture resistance. The common complaints are the higher cost than fiberglass and the weight and itch of handling it.
Comfortbatt R-30 is a semi-rigid stone wool insulation batt from ROCKWOOL. Each batt measures 7.25 in. thick, 15.25 in. wide and 47 in. long. It is sized for wood framing with studs spaced a nominal 16 in. on center.
The batts are noncombustible per ASTM E136 and rate 0/0 for flame spread and smoke development per ASTM E84. They are intended for attics, cathedral ceilings and other deep cavities, not shallow 2x4 walls.
