19 Rails, not of metal; framework, not of metal, for buildings; beams, not of metal; structures and structural support elements, not of metal; bricks; roof tiles of glass; roof tiles of cement mortar; roof tiles, not of metal; transparent roof tiles of plastics; coverings, not of metal; coverings for buildings, not of metal; non-metal woven coverings for use as geotextile materials; non-metal woven coverings for use as geotextile materials for building purposes; roofing shingles; roofing materials [building materials, not of metal]; pantiles of glass; pantiles, not of metal; plastic roofing sheets; roofing sheets, not of metal; roofing, not of metal; roof coverings, not of metal; shingles, not of metal.