An improved acoustical damping wall (ceiling or floor) or door material
comprises a laminar structure having as an integral part thereof one or
more layers of viscoelastic material which also functions as a glue and
one or more constraining layers, such as metal, cellulose, wood, or
petroleum-based products such as plastic, vinyl, plastic or rubber. In
one embodiment, standard wallboard, typically gypsum, comprises the
external surfaces of the laminar structure; and one or more constraining
layers are fabricated between the gypsum exterior. The resulting
structure improves the attenuation of sound transmitted through the
structure.