Compliance Update: May 2026
While this article discusses the logic established under NCC 2019, the prohibition of coatings to achieve fire hazard properties has been further strengthened in NCC 2022 Clause C2D11 (NSW) and remains a critical focus in the NCC 2025 Preview.
Looking for verified fire data? Explore our Fire Hazard Properties & Compliance Page to see how we achieve Group 1 and 2 ratings without risky on-site coatings.
Some companies are promoting the use of fire intumescent coatings in order to achieve a Fire Group 1 or Fire Group 2 rating when using timber wall or ceiling products. This includes claims of compliance for slotted, perforated, and slatted panels. On the face of it, there doesn’t seem to be a problem with this as it is generally in accordance with AS5637.1 and NCC 2022 Specification 7 (formerly C1.10).
However, note the following regarding this:
- These products have never been fire tested on perforated, slotted, or slatted panels.
- The coating must be inspected annually to ensure it has not been removed, covered over, or tampered with. (Note that most maintenance managers would not be able to ensure this. How could they when this instruction is buried in a maintenance manual somewhere, and not in a large sign on the relevant wall!).
- The coating typically takes 3 weeks to cure.
- Perforations or slots must be free of dust.
- A 230-micron paint film is required for the base coat. This would be very hard to achieve on the edges of holes and slots of MDF panels as they are so porous and this would even be hard to achieve on the edges of interior timber battens. (Note this is typically applied on site – see diagrams below showing the effect of this).
The fact that a Codemark certificate is available is cold comfort. After all, a Codemark certificate can be withdrawn at any time.
Don’t leave your compliance to a theoretical paint film.
Work through your specific lining system and fire requirements with our technical team to find a factory-certified pathway.
As at the writing of this article, 46 Codemark certificates have been withdrawn, over against just 183 Codemark certificates that are still valid.
Thus, while the paperwork may be accepted by a BCA consultant, you would not have the assurance that there would not be a problem if there was a fire affecting your timber wall panels interior.
How intumescent paint must be applied as per certification (in red)
How intumescent paint is applied in reality (in red)
The above listed variances between theory and what is practically achievable is why NSW has excluded coatings for use to achieve fire ratings in the BCA.
NCC 2022 Clause C2D11 NSW (b): “Paint or fire-retardant coatings must not be used to achieve compliance with the required fire hazard properties.”
Unfortunately, even though the NSW government has specifically excluded intumescent paints from their version of the BCA, anyone with a fire safety engineering qualification and general fire safety engineering experience, can register under the DBPA and approve its use!
“As of 2026, the reliance on performance solutions involving intumescent coatings is under increased scrutiny by building surveyors across all states, not just NSW. The industry is moving away from ‘theoretical’ safety toward verified, factory-tested systems.”
Such is the sad state of the compliance legislation in our country. Thankfully, due to the Shergold Weir Report, all states are now addressing these problems and omissions in their legislation, although these changes may take years to filter through and affect real change.
The variances between theory and what is practically achievable with intumescent paints is also why SUPAWOOD and other professional linings companies will not use or promote the use of intumescent paints to achieve fire compliance.
SUPAWOOD ensures all our fire certifications align with how our panels are actually installed on site. We give you peace of mind that one of our fire certifications represents exactly what gets installed in your project.
To see how we achieve Group 1 and 2 ratings without risky on-site coatings. Explore our Fire Hazard Properties & Compliance Page
If you have any questions about achieving fire compliance in your project. Schedule a session with our experts to review specifications and shop drawings.