Rockwool Safe'N'Sound® Fire & Sound Insulation (Specific for 2" by 4" WOOD framed walls with joists spaced 24" apart) Dimensions: 3" x 23" Coverage: 60.1 sq. ft./bag Application: Walls (interior partitions), Floors, Ceilings Rockwool Safe'N'Sound® is a stone wool insulation that offers superior fire resistance (melting point of 1177° C), sound absorption, and moisture resistance. As an alternative to fiberglass, this mineral wool insulation is easy to cut and fits into walls using friction. Data Sheet