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The NCC 2022 Volume 2 provides a transition period enabling users to continue to use the corrosion protection requirements in NCC Volume Two 2019 Amendment 1 until adoption on 1 May 2024.
NCC 2022 Volume Two Part H1D6 provides several deemed-to-satisfy (DTS) options for steel structures, which satisfy performance requirement H1P1 and cover corrosion protection:
As the NCC is a performance-based code, it is also valid to develop a Performance Solution supported by appropriate evidence of suitability.
Clause 6.3.9 of the ABCB Housing Provisions Standard (HPS) replaces the old Clause 3.4.4.4 and contains extensive changes to the corrosion protection tables to include greater detail and additional options.
The environmental corrosion classifications have been updated to align with corrosion categories used in other DTS provisions and AS 4312. Four environmental classifications are defined depending on proximity to the coast – Low, Medium, High and Very High. Users should refer to the new NCC table to ensure the appropriate corrosion protection options are selected for their location.
The provisions now require structural steel not built into a masonry wall to be protected against corrosion using one of the options provided in Table 6.3.9a. Options for galvanising and duplex coatings per AS 2312.2, and paint coatings per AS 2312.1 are provided for the four different environment classifications.
New Tables 6.3.9b and 6.3.9c provide more detail about the paint and duplex coating systems nominated in Table 6.3.9a.
The HPS clause also provides information on surface preparation and repair to on-site damage including being free of rust prior to painting, preparations for the surface where zinc is applied, and recoating with the required coatings when cut or welded on-site.
Table 6.3.9a recommends four different minimum hot-dip galvanising classifications. The coating mass in g/m2 for each environment ranges from Low (HDG75) to Very High (HDG900).
However, these classifications do not necessarily reflect actual products available on the market. The Australian Galvanisers Association has advised that when approaching a galvaniser the following specifications are applicable (based on AS/NZS 2312.2 and AS/NZS 4680):
AS 4100 has undergone revision and the 2020 version of the Standard has now been adopted. Corrosion protection requirements are covered within Clause 3.8.6 and guidance in Appendix C, refers to the following secondary reference standards:
Using AS 4100 will generally align with the HPS provisions but provides a broader range of options for coating systems using secondary reference standards.
HIA notes that HPS Clause 6.3.9 no longer references internal environments, which has prompted several questions to HIA from members. AS 4100 provides options for structural steel elements located in dry internal environments:
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