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ROCKWOOL Comfortbatt R-30 is semi-rigid stone wool batt insulation sized 7.25 x 23 x 47 in. for wood studs at 24 in. on center, about 30.03 sq ft per bag. It targets deep cavities such as attics and cathedral ceilings, not nominal 2x4 bays. Stone wool is noncombustible per ASTM E136 and rates 0/0 flame/smoke per ASTM E84, which sets it apart from many foam and fiberglass products. Owners value its density, cut-to-fit handling and sound damping; the main trade-offs are the higher cost than fiberglass and the itch and dust some notice during install.
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Owners and installers praise Comfortbatt for its density, easy cutting and quiet result, and many choose it over fiberglass for fire and sound reasons. Complaints center on cost, dust while cutting and the stiffness of the batts in tight spaces.
ROCKWOOL Comfortbatt R-30 is a semi-rigid stone wool insulation batt. Each batt measures 7.25 in. x 23 in. x 47 in. It is sized for wood studs spaced 24 in. on center, which ROCKWOOL lists as a 23 in. x 47 in. module.
The batts are meant for deep cavities such as attics, cathedral ceilings, and compatible wood framing. They are not for nominal 2x4 stud bays. The insulation is noncombustible per ASTM E136, and manufacturer documentation lists 0/0 flame and smoke ratings per ASTM E84.
