ROCKWOOL RXCB551525 COMFORTBATT R23 5.5 In. X 15.25 In. X 47 In (39.82 SQFT)
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ROCKWOOL Comfortbatt R23 is semi-rigid stone wool batt insulation for nominal 2x6 wood-framed walls, attics, ceilings and exposed floors, sized 5.5 in. thick by 15.25 in. wide by 47 in. long for 16 in. on-center framing. It reaches R-23 at 5.5 in., so it fits a 2x6 cavity without the extra depth fiberglass needs for the same R-value. Stone wool is noncombustible (ASTM E136) and rates 0/0 on flame spread and smoke developed (ASTM E84), with a melting point around 2150 F. Against fiberglass batts it costs more and is heavier, but it holds its shape, cuts cleanly and resists moisture and fire better; it is not meant for 3.5 in. 2x4 cavities at full thickness.
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Owners and installers who use stone wool batts like these praise the stiffness, clean cuts and snug fit, and note quieter rooms and better fire peace of mind than fiberglass. Complaints center on weight, dust and the higher cost.
ROCKWOOL Comfortbatt R-23 is a semi-rigid stone wool insulation batt. It is made from basalt and recycled steel slag, and its edges are flexible. Each batt measures 5.5 in. thick, 15.25 in. wide and 47 in. long.
It is sized for nominal 2x6 walls with wood studs spaced 16 in. on center. It can also be used in attics, ceilings and exposed floors when a 5.5 in. R-23 batt fits the cavity. It is not for 3.5 in. 2x4 cavities at full thickness.
The batt is noncombustible per ASTM E136. It has a 0/0 flame spread and smoke developed rating per ASTM E84.
