Homasote 440 SoundBarrier 5/8" x 4'

440 SoundBarrier® controls sound in floors, walls and ceilings. Independently lab tested and time-proven in millions of square feet of residential and commercial structures, 440 SoundBarrier® is a special-density, structural board made from 100 percent environmental Homasote®cellulose fiber, a homogeneous composition manufactured with uniformly distributed protection against termites, rot and fungi and resistance to moisture. It also insulates, with twice the R-value of wood. Made with FSC® certified material.