Rockwool Stone Wool Insulation for Floors

Dense mineral-wool batt insulation purpose-built for acoustic performance. Rockwool's tangled stone-wool fibers absorb cavity resonance far more effectively than standard fiberglass — the default cavity fill we specify across every sound-rated wall, ceiling, and floor assembly. Three R-values available for standard 2×4 framing.

Rockwool stone wool insulation batts — dense mineral-wool acoustic and thermal insulation for 2x4 stud and joist cavities.

Available Rockwool Variants

Safe'N'Sound R11

Rockwool Safe'N'Sound R11

Dense, non-combustible stone wool batt engineered for sound absorption inside stud and joist cavities — our default recommendation for walls, ceilings, and floors.

Rockwool Comfortbatt R13

Higher-R stone wool batt that pairs Rockwool's acoustic density with added thermal performance for standard 2×4 cavities.

Rockwool Comfortbatt R13: price on request.

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Comfortbatt R15

Rockwool Comfortbatt R15

Higher-R stone wool batt that pairs Rockwool's acoustic density with added thermal performance for standard 2×4 cavities.

Rockwool Comfortbatt R15: price on request.

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Same stone-wool density, three R-values

Safe'N'Sound R11 is our default recommendation for sound-rated assemblies — engineered specifically for acoustics. Comfortbatt R13 and R15 step up the thermal rating in the same 2×4 cavity depth while keeping Rockwool's acoustic-grade density, ideal for exterior walls where thermal performance also matters.