15" Safe 'n' Sound Insulation for 2"x4" Wood Framing (59.73 Sqft per bag)SAFEnSOUND sound proof insulation is a stone wool insulation product for use in interior wall partitions of residential wood and steel stud construction. It is especially useful when superior fire resistance and acoustical performance are required. This non combustible, lightweight product has excellent acoustical dampening properties and is dimensionally stable which makes it ideal for friction fit in wall, ceiling and floor applications. The product