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Example of corrosion on steel pole

NCC 2022 Introduces Robust Changes to Steel Corrosion Protection

Starting from 1 October 2023, the National Construction Code (NCC) 2022 has introduced major revisions to the Deemed-to-Satisfy (DtS) Provisions concerning corrosion protection. This article, will delve into the purpose behind the alterations  and explore the specifics of the changes to provide valuable insights into ensuring compliance with the updated regulations.

What problem will it fix?

The inadequate protection of structural steel has been leading to premature structural failure, especially when exposed to ground level moisture.  It is important to note that the use of bituminous paint as corrosion protection for exposed steel columns will no longer meet the acceptable standards.

Example of Corrosion on Steel Beam
Example of Corrosion on Steel Beam

What is changing?

The NCC 2022 encompasses extensive modifications to corrosion protection requirements, both for exposed structural steel and non-conforming building products. Key revisions include:

  • Structural steel members not built-in to a masonry wall must be protected. This includes steel beams and steel cleats in roof spaces.
  • New tables to outline specific corrosion protection demands based on exposure conditions (see image and links below)
  • Barrier coat for zinc coatings to prevent peeling of domestic enamels.

TBAC Tip: We deem beachside suburbs of Far North and North Queensland to be sheltered bays. Whilst wind may cause white tips at times, we do not consider this to be “breaking surf”.

Table 6.3.9a Minimum Protective Coatings for Structural Steel Members
Table 6.3.9a Minimum Protective Coatings for Structural Steel Members
Table 6.3.9b Paint Coating System Specification
Table 6.3.9b Paint Coating System Specification
Table 6.3.9c Paint Coating System Specification
Table 6.3.9c Paint Coating System Specification

TBAC Tip: Where zinc coatings are applied, a barrier coat must be first applied to prevent domestic enamels from peeling.

What do you need to do?

To ensure adherence to the updated corrosion protection regulations in the NCC 2022, stakeholders should undertake the following measures:

Building Designer/ Architect: Align specifications with the newly introduced tables within Part 6.3.9 of the ABCB Housing Provisions. These tables detail corrosion protection requirements based on exposure conditions.  Methods such as hot dip galvanizing, duplex systems, or paint systems must adhere to AS 2312 standards.

Builders:  Inform trades about the NCC changes. Contact steel fabricators to ensure proper protection of prefabricated steel products.

The changes apply to approvals issued after the 1 October 2023. If you would like more information or further training just email.

Useful Links

National Construction Code 2022 | ABCB Housing Provisions

Non-Conforming Building Products Code of Practice

Non-conforming building Products QBCC Fact Sheet

Remember the advice given in this article is of a general nature and may vary upon individual construction circumstances. Always obtain your own advice to ensure it is specific to your individual construction needs.

For more on the NCC 2022 changes