Ceiling panels of mineral fibres; non-metal cladding in the nature of mineral wool boards for use in building; non-metal roof vents comprised of mineral wool boards for ventilation of residential and commercial buildings, non-metal roof flashing comprised of mineral wool boards, non-metal construction materials, namely, soffits and fascias comprised of mineral wool boards; non-metal building materials, namely, wall, floor and ceiling panels made of mineral wool and mineral wool fibres; proces...