Building materials and building envelope products made wholly or primarily of glass, cement, and synthetic materials, namely, prefabricated building wall framing, composite panels, cladding for buildings, curtain walls, door frames and casings, doors, windows, wall boards and wall panels not of metal; non-metal curtain walls, non-metal prefabricated walls; building envelope products, namely, finishing panels made of cement, synthetic materials, or glass for building construction purposes; con...