19 Building glass; explosion-resistant building and constructional materials and construction elements, not of metal, in particular facade panels and glass panes; non-metal building boards, namely, fiber glass boards, floor boards, boards of wood, ceiling boards of wood, exterior boards, gypsum boards, fire-resistant boards for construction, water-resistant boards for construction, paper board for building, wall boards, sheathing boards, plaster boards, and plywood boards; transportable buildings, not of metal; roofing, not of metal, in particular filigree roof structures of glass; gutters, not of metal; windows, not of metal; non-metal window frames; window glass, for building; plate glass windows, for building; insulating glass for building; roof flashing, not of metal, for building; wall claddings, not of metal, for building; casement windows, not of metal; props, not of metal, namely, beams and supports for construction and building purposes; wainscoting, not of metal; joists, not of metal; framework for building, not of metal; stairways, not of metal for use in buildings, in particular staircases of glass; stair-treads, not of metal, in particular stair-treads of glass; stringers as parts of staircases, not of metal, in particular stringers of glass; door structures and elements, not of metal namely, doors, door panels, door units, door frames, door casings, and door jambs; surfacings, not of metal, for building, namely, wall claddings; wall linings, not of metal, for building, namely, plastic foils and textile membranes for wall linings; non-metallic rigid gutter pipes for building; asphalt, pitch and bitumen; transportable buildings and monuments, not of metal; non-metallic prefabricated building elements for on-site assembly, namely, wall, ceiling and facade panels; non-metallic prefabricated building components, namely, wall, ceiling and facade panels; non-metallic molds for forming wall, ceiling and facade panels for building