Have this Owens Corning R21 Thermafiber Fire and Sound Guard Plus Mineral Wool Insulation Batt delivered to your job site. Can be used in a variety of applications, including interior and exterior walls, ceilings, basement walls and crawl spaces. Sound control: mineral wool provides superior sound control in critical areas such as bedrooms, home theaters and bathrooms. Fire resistant: fire resistant to temperatures above 2,000°F (1,093°C). Thermal comfort: mineral wool provides excellent thermal properties in a variety of R-values to meet building codes and wall types (2 x 4 and 2 x 6). Recycled content: composed of up to 70% recycled material, recycled content verified by ICC-ES. Measure and cut – fire and sound guard plus insulation is easy to cut with a serrated knife for custom fitting around electrical boxes, pipes, duct-work, wiring or between non-standard studs and joists. Squeeze and insert – fire and sound guard plus insulation is flexible and pliable, simply squeeze the sides to compress the insulation and insert into the desired wall. Release and expand – once in place, fire and sound guard plus insulation naturally expands to fill in the space, creating a snug, custom fit.