19 Lumber; plywood; wooden floor boards; building stone; slate; plasterboard; cement; cement slabs; roofing tiles, not of metal; tiles, not of metal, for building; tiles, not of metal; fireproof cement coatings; refractory construction materials, not of metal; bitumen; non-metal water-resistant boards and panels for construction; water-pipes, not of metal; drain pipes, not of metal; rigid plastic pipes for use in building; rigid aluminum-plastic composite pipe; ducts, not of metal, for ventilating and air-conditioning installations; roof gutters, not of metal; water-pipe valves, not of metal or plastic; windows, not of metal; doors, not of metal; building materials, not of metal in the nature of stone veneers, PVC trim, marble, concrete-based slabs; cladding, not of metal, for building; rigid plastic board for construction; shutters, not of metal; rigid plastic rod for construction; advertisement columns, not of metal; building glass; coatings being building materials in the nature of non-metal cladding; works of art of stone, concrete or marble; memorial plaques, not of metal; binding agents for making stones, namely, concrete and mortar mix