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Construction elements made of metal namely, metal struts, metal strut channel framing, metal strut framing systems comprised primarily of metal channels, metal channel screws, metal brackets, metal clamps, inserts and fittings, metal channel nuts, rod couplers, lock washers, bolts, seismic rod stiffeners, all-thread rods, channel end caps, metal strut channel and framing accessories, namely, brackets, nuts, washers, fittings, inserts, clamps and end caps; Construction elements made of metal, namely, metal supports for supporting pipes, conduits, solar racking, ducts, cable tray systems, rooftop walkways and HVAC systems on rooftops

Heating elements; Hot water heating installations; Parts for hot water heating installations, namely, baseboards, fins, baseboard end caps, baseboard corner caps, baseboard brackets, baseboard joiners, expansion tracks, cover extensions, dampers, and heating elements

Non-metal building material, namely, rubber roof-top supports, rubber roof-top supports with attached strut channels, rod clamps or rod extensions, rubber slip sheets for roof-top supports, and rubber pipe hanger supports