19 Building materials, namely, pre-cast concrete wall forms; concrete wall panels; concrete walls for building; facade claddings, not of metal, for building; non-metal building construction materials namely, roof, façade, wall and floor coverings and their parts and fittings, namely, paving slabs; non-metal building construction materials namely, roof, façade, wall and floor coverings and their parts and fittings, namely, polycarbonate and bitumen corrugated sheets; non-metal building construction materials namely, roof, façade, wall and floor coverings and their parts and fittings, namely, self-adhered and synthetic roofing underlayment; non-metal building construction materials namely, roof, façade, wall and floor coverings and their parts and fittings, namely, weatherboards; non-metal building materials, namely spacer stocks and frames made of plastic for spacing glass and metal sheets; plastic façade panels for construction purposes; wall panels, not of metal; Smart windows, non-metal; safety windows; self-tinting windows