Non-metallic building materials, namely, rigid pipes made of plastics for building or industry; non-metallic piping for water distribution, sewage, drainage, irrigation, and rainwater; non-metallic rain gutters and trench drains; ventilation devices, namely, non-metal wall and roof vents for commercial building ventilation; non-metal roofing accessories, namely, roofing for use as roof ridges and eaves

Building materials made wholly or primarily of metal, namely, pipes and couplings and fittings therefor, metal valves not being part of machines

Building materials made wholly or primarily of metal, namely, pipes and couplings and fittings therefor, stairways and parts and fittings therefor, fences, hot and cold rolled sections in tube, bar, strip, flat, sheet, plate, block, rod and billet form drainpipes and parts and fittings therefor, gratings and parts and fittings therefor, manhole covers and parts and fittings therefor, manhole steps, gutters, hopper heads downpipes, handrails, access covers for underground pipework and replacem...