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Rockwool Comfortbatt R-15 is a semi-rigid stone wool batt for 2x4 wood stud walls, joists and attic floors, sized 16 in. wide by 47 in. long and sold in a 12-pack. Its flexible edge compresses as you push the batt in and springs back against the studs, so it fills gaps left by warped or off-center framing and holds its rated R-value. Stone wool is non-combustible, resists moisture and rot, and absorbs sound well, which is where it beats fiberglass batts. It costs more than fiberglass and is heavier to handle, so it suits builders who want fire and sound performance and a batt that cuts cleanly and stays put.
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Owners and contractors rate Comfortbatt highly for sound deadening, fire resistance and staying in place, and many say it is easier to cut and fit than fiberglass. The main complaints are the higher cost, the itch from the fibers and the extra weight.
Rockwool Comfortbatt is a stone wool insulation for wood studs and joists. It is used in new residential construction and in renovations, in walls, attics, ceilings, and floor frames. This pack has 12 batts, each rated R-15 and measuring 16 in. x 47 in.
The batt is semi-rigid with a flexible edge. The edge compresses as the batt is inserted, then springs back to expand against the studs for a complete fill. This lets the batt adapt to normal variations in stud spacing caused by distortion or warping, so the expected R-value is achieved.
The insulation cuts easily and is non-combustible. It absorbs sound well, resists water, and absorbs little moisture. It does not rot or promote the growth of fungi or mildew. It is made from natural and recycled materials, and the product and process are free of CFCs and HCFCs. It can contribute to earning LEED points.
