Non-metallic building materials, namely, bricks, natural stone, building stone, non-metallic paving tiles, sand, concrete, fly ash, cladding, undersides of stone, cement, and lime; paving blocks, slabs, posts and panels, veneers of stone, cement, plaster and mortars, natural lime; non-metallic rigid pipes for building; asphalt, pitch and bitumen; transportable buildings not of metal; monuments not of metal; building panels, not of metal; scaffolding, not of metal; building glass; insulated gl...