Metal building materials and systems for walling, roofing, framing, flooring, ceilings and cladding; common metals and alloys of common metals; precoated metal sheet, coil and strip; precoated metal building materials; metal roof and wall cladding; metal ceiling battens, trusses, purlins, joists and structural decking; metal formwork and reinforcing materials for buildings; metal mesh, expanded metals; metal rainwater products, namely metal fascias, guttering, ridge capping, downpipe and metal rainwater tanks; metal building frames, framing sections and accessories thereto for houses and commercial buildings; transportable buildings of metal