Flexible sound barrier sheets formed of a polymer, asphalt or ethylene copolymer composition for use in the manufacture of wall, floor and ceiling panels; acoustical panels for buildings; sound absorbing flooring underlayment; acoustical insulation for buildings; substances for insulating buildings against moisture including tapes; acoustic underlayment for buildings; insulating tapes for buildings which act as an acoustic barrier; thermoplastic sheets for use in the manufacture of partition ...