19 Beams, not of metal; balustrades, not of metal; concrete; bitumen; joists, not of metal; building paper; stained-glass windows; felt for building; geotextiles; gypsum [building material]; plaster; chimney pots, not of metal; prefabricated houses [kits], not of metal; chimney shafts, not of metal; jalousies, not of metal; framework, not of metal, for building, including framework, not of metal, for installation of stretch ceilings; bricks; pillars, not of metal, for building; brackets, not of metal, for building; buildings, not of metal; buildings, transportable, not of metal; roofing, not of metal; building timber; reinforcing materials, not of metal, for building; bituminous products for building; tar; pitch; building materials, not of metal; refractory construction materials, not of metal; mosaics for building; mouldings, not of metal, for cornices; mouldings, not of metal, for building; flashing, not of metal, for building; roof flashing, not of metal; duckboards, not of metal; wall claddings, not of metal, for building; coatings [building materials]; laths, not of metal; wall linings, not of metal, for building; props, not of metal; wainscotting, not of metal; building panels, not of metal; partitions, not of metal; tarred strips for building; planks of wood for building; wall tiles, not of metal; floor tiles, not of metal; tiles, not of metal, for building; cement slabs; tile floorings, not of metal; slabs, not of metal, for building; roof coverings, not of metal; roofing, not of metal, incorporating photovoltaic cells; cladding, not of metal, for building; linings, not of metal, for building; floors, not of metal; ceilings, not of metal, including stretch ceilings, not of metal; agglomerated cork for building; grout; vinyl siding; building glass; insulating glass for building; enamelled glass, for building; hips for roofing; ducts, not of metal, for ventilating and air-conditioning installations; rigid pipes, not of metal, for building; angle irons, not of metal; cement; pantiles, not of metal; roofing tiles, not of metal; roofing slates; concrete building elements