Acoustiblok® is a unique 1.1 lb. psf U.L. Classified, high S.T.C. reinforced dense noise isolating material which is utilized as a structural treatment for reducing sound transmission. It contains no lead or asbestos materials. It is specifically formulated to meet rigid requirements such that is approved by U.L. for walls, ceilings and floors. Acoustiblok® is typically applied as part of layered wall, ceiling or floor construction. It is usually stapled to wood studs or screwed to metal studs prior to drywall.