19 Non-metallic building materials, namely, building panels and building panels for floors, sub-floors, walls, partition walls, ceilings, roofs and foundations for buildings; building and construction boards not of metal, namely, of glass, wood, hardwood, granite, stone, timber, cement, concrete, and porphyry, and wall boards; decorative moldings and decorative trim made of rigid foam materials for use in building; non- metal wall, floor and ceiling panels for use in building; non-metallic structural building systems comprised of non-metal building panels and materials not of metal, namely, building glass, wood, hardwood, granite, stone, timber, cement, concrete, porphyry and wall boards and panels, structural timber and wood, structural concrete slabs; non-metallic structural building panels; and non-metallic structural building materials, namely, glass, wood, hardwood, granite, stone, timber, cement, concrete, porphyry and wall boards and panels, structural timber and wood, structural concrete slabs