Rockwool Comfortbatt® Thermal Batt Insulation (Specific for 2" by 4" WOOD framed walls with joists spaced 24" apart) R-Value: 14 Dimensions: 3½" x 23" Coverage: 60.1 sq. ft./bag Application: Exterior Walls Rockwool Comfortbatt® is a semi-rigid stone wool insulation that is non-combustible (melting point of 1177° C), sound reducing, and moisture resistant. As an alternative to fiberglass, this mineral wool insulation is easy to cut and maintains its R-Value after compression during installation. Data Sheet