Specifically engineered to use in exterior walls, cathedral ceilings, attics, basement walls, exposed floors, and heated crawl spaces. Easily cut, non-combustible, excellent sound absorbency. Does not rot or sustain vermin, does not promote growth of fungi or mildew. Chemically inert, non-corrosive, water resistant. CFC and HCFC-free product. Made from natural and recycled materials. 5.5 x 15.25 x 47". Covers upt to 39.8 sq.ft. R22. Wood fibers.