19 [ Glass for building purposes; non-metallic building materials, namely, wood and concrete beams, bricks, cement mixes, felt roof coverings, gravel, hardboard, joints for floors and walls, joists, laminated beams, lumber, mortars, particle board, plaster, plywood, roofing cement, tarred and asphalted roofing paper, roofing sealants, shingles, shutters, siding, skylights, stucco, studs, trusses; non-metallic articles for use in building, namely, bifolds, wooden window casements, ceramic tiles, door frames, doors, fencing gates and panels; fireplace mantels, garage doors, gutter pipes, millwork, patio doors, pavers, sliding doors, stained glass windows, screen doors, tiles, window screens; non-metallic articles for use in building repair and building decoration and in civil engineering construction, namely, asphalt, concrete blocks, ceiling panels, column posts and railings; concrete beams, fiberboard, flashing, granite, molding, paneling, plywood, roofing panels, shutters, trusses, vinyl flooring; non-metallic pipes for water supply, drainage, rainwater and sanitary purposes ]