As the name suggests, steel is processed while cold. It is manufactured from hot rolled coil that has been chemically cleaned before being rolled. The coil is initially cold, however while being reduced, the coil will get hotter as the steel work hardens. The cold rolling reduces the thickness of the steel and at the same time changes the mechanical properties of the steel. Cold rolled steel must be further processed, as the steel will react with water in the air and form rust. In most cases, it is covered with a thin layer of oil to prevent oxygen reacting with surface. The steel coils can be annealed (heated in a controlled atmosphere) to make the steel more formable (cold rolled annealed) or further processed on the metallic coating line, with a coating of either zinc (galvanised) or zinc-aluminium alloy (ZINCALUME® steel) applied. Cold rolled steel is available in a range of grades, each with a range of properties for differing applications.
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
The product meets the requirements set out in the following documents, or relevant parts of cited standards within the documents:
Frame suppliers will be able to advise which steel framing system they use, provide frame and truss detail drawings and a Producer Statement (PS1) to demonstrate compliance with NZBC Clause B1 - Structure. NASH 3405 an Alternative Solution is the current standard referred to by local Building Consent Authorities NASH Standard Residential and Low-Rise Steel Framing Part 1: Design Criteria Version 2: October 2010. 50-year Durability Statement for AXXIS Steel for framing is available from New Zealand Steel. Steel is non-combustible. GIB® Fire Rated Systems are available for load bearing and non load bearing steel frame walls and load bearing floor/ceiling systems (www.gib.co.nz). The Steel Construction Institute (SCI) in the UK has recently carried out a fire test on a light steel floor that achieved 90 minutes fire resistance to the BS EN 1365 fire test. See www.steelconstruction.org
The product has and can make available the following additional evidence to support the above statements:
See:
Co-ordination Ensure details and fixings required are provided for in the steel fabricators framing system. Refer to all drawings and calculations. Installation Install AXXIS roll formed framing to any technical recommendations or instructions given by the steel frame fabricator. Qualifications Work to be carried out by tradespeople experienced, competent and familiar with the materials and techniques specified. Information The steel frame supplier will provide a territorial authority- approved producer statement(design) and supplementary drawings showing dimensions, bracing and assembly
Environmentally sustainable manufactured from locally mined iron-sand New Zealand Steel is ISO14001 accredited Minimal manufacturing & rollforming wasteage. Steel is100% recyclable and/or able to be reassembled at another site. www.sustainablesteel.co.nz