Acoustical insulation for buildings, namely, [ sound absorbers and diffusers; ] mineral wool for use in and around the void spaces above the tops of building walls created by the intersection of the wall and the metal or concrete deck to serve as an acoustical barrier between rooms or floors; high temperature mineral wool insulation, including pre-formed blocks, for use in areas above and around windows and in vertical spaces between metal or concrete decks to delay the spread and/or transfer of flames, hot gases and heat between floors and add fire protection to the underside of the decks; when installed in combination with classified smoke seal products to provide a sealed barrier against spread and/or transfer of particulate smoke and air