JM TempControl® Mineral Wool insulation is made from high-density, non-combustible fibers that helps delay the spread of fire in exterior walls, basements, and heated crawl spaces. It also delivers exceptional thermal performance for the life of your home to keep your family warm in the winter and cool in the summer while reducing your heating and cooling bills to save you money year- round. JM mineral wool batts are made of inorganic fibers derived from basalt, a volcanic rock, and are enhanced with glass fibers. Advanced manufacturing technology ensures consistent product quality, with high-fiber density and low shot content for excellent performance. JM mineral wool batts are inorganic, non-combustible, moisture resistant, non-deteriorating, and will not mildew or support corrosion.