Silica (quartz); paving blocks, not of metal; building stone; stone; quartz; tile floorings, not of metal; floor tiles, not of metal; tiles, not of metal; mosaics for building; wall tiles, not of metal, for building; tiles, not of metal, for building; building materials, not of metal; framework, not of metal, for building; cladding, not of metal, for building; facings, not of metal, for building; paving slabs, not of metal; slabs, not of metal; staircases, not of metal; stringers (parts of staircases), not of metal; floors, not of metal; cabanas not of metal; buildings, not of metal; roof coverings, not of metal; door casings, not of metal; door frames, not of metal; shutters, not of metal; props, not of metal; roofing, not of metal; wall claddings, not of metal, for building; wall linings, not of metal, for building; stair-treads (steps),not of metal; arbours (structures); pools (swimming-)(structures, not of metal); buildings, transportable, not of metal; greenhouses, transportable, not of metal; aquaria (structures); wainscoting, not of metal; panels (building-) not of metal; flashing, not of metal, for building; window frames, not of metal