Blown mineral wool (rock wool) combines non-combustibility, excellent acoustic performance, and good moisture resistance in one product. It is the preferred blow-in material for multi-family buildings, party walls, and assemblies requiring fire-rated insulation.
Mineral wool achieves R-3.0 to R-3.3 per inch as blown material. Its density and composition make it particularly effective at reducing sound transmission — a major benefit in multifamily residential and commercial applications across the Boston area.
Will not burn, melt, or contribute to fire spread — the highest fire resistance of any blown material
Dense fiber structure absorbs sound waves — critical for party walls and multifamily floors
Repels water while remaining vapor permeable — ideal for New England climate conditions
Does not settle, compress, or lose R-value over time
Assembly requirements confirmed — fire rating, STC target, and thermal requirements.
Blown to specified density for both thermal and acoustic performance.
Fire rating and acoustic documentation provided for permit and compliance purposes.
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