Drain pipes, not of metal; aluminium alloy plastic-lined pipe; non-metal building materials, namely, soffits, fascia, plastic pipe supports, semi-worked woods; water pipes, not of metal; non-metal pipe fittings; reinforcing materials not of metal for building purposes; bituminous products for building, namely, bituminous roof coatings; refractory materials, namely, fire resisting wood, fireclay, non-metal fire-resistant boards and panels for construction; non-metal coating materials for build...