Johns Manville R-23 Mineral Wool Insulation Batt 24" x 48" (40 sq ft)

Johns Manville mineral wool batts are made of inorganic fibers derived from basalt, a volcanic rock and are enhanced with glass fibers. The advanced manufacturing technology ensures consistent product quality with high-fiber density and low shot content for excellent performance. High-density material, with a melting point of 2,000 degrees Fahrenheit, inhibits the spread of smoke or flame and gives extra time for evacuation. Save up to 15% on heating and cooling costs.