Non-combustible cladding in Australia is no longer a preference — it’s a regulatory baseline for a significant portion of the building stock. Since the 2019 amendments to the National Construction Code, the requirements around external wall materials have become more prescriptive, more enforced, and considerably better understood by the industry.
Yet confusion persists. The term “non-combustible” is used loosely in marketing, inconsistently in specifications, and sometimes incorrectly on site. This guide sets out what the NCC actually requires, what non-combustible means in a testing context, and how architects, specifiers, and installers can verify compliance with confidence.
What Does Non-Combustible Actually Mean?
In Australian construction, “non-combustible” has a specific, testable definition. A material is deemed non-combustible if it satisfies the criteria of AS 1530.1 — Combustibility Tests for Materials. This standard subjects a small sample of the material to a furnace test at 750°C and measures temperature rise, flaming, and mass loss.
A material that passes AS 1530.1 is classified as non-combustible. One that doesn’t, isn’t — regardless of what its marketing says.
This distinction matters because the NCC doesn’t use the word “fireproof” or “fire-resistant” interchangeably with non-combustible. Each term has a different regulatory meaning, and conflating them creates real compliance risk on projects.
Common Materials That Are Non-Combustible
Solid aluminium (3mm and above), steel, concrete, brick, stone, fibre cement, and glass are generally accepted as non-combustible. Aluminium composite panels (ACPs) with polyethylene cores are not non-combustible — and this is the material at the centre of the cladding crisis in Australia and globally.
It’s worth noting that the composition matters as much as the material category. Not all aluminium products are equal. A solid aluminium panel tested to AS 1530.1 meets the standard. An aluminium-faced composite with a combustible core does not, even though both might be described as “aluminium cladding” in casual conversation.
What the NCC Requires for External Walls
The NCC sets out requirements for external walls through its Performance Requirements and the Deemed-to-Satisfy (DtS) provisions. For fire safety in external walls, the key provisions sit within NCC Volume One, Section C — Fire Resistance, specifically the performance requirements relating to the spread of fire between buildings and within a building via external walls.
For Type A and Type B construction — which covers most multi-storey residential (Class 2), commercial, and institutional buildings — the NCC requires that external wall assemblies meet specific fire performance criteria. The most straightforward way to demonstrate this is through the Deemed-to-Satisfy (DtS) pathway.
The Deemed-to-Satisfy Path: How Most of the Industry Complies
The DtS provisions in the NCC specify acceptable materials and construction methods that are deemed to satisfy the Performance Requirements without further analysis. For external cladding on Type A and Type B buildings, the DtS path is clear: use materials that are non-combustible as determined by AS 1530.1.
This is the compliance pathway that the vast majority of the Australian construction industry uses — comfortably more than 95% of projects. The reason is straightforward: if the cladding material itself is inherently non-combustible, the material-level fire compliance question is resolved at the point of selection. There’s no need for expensive full-scale testing of the wall assembly, no need for complex fire engineering assessments of the cladding material, and no ambiguity about whether the product meets the code.
Solid aluminium is a good example. As a material, 3mm solid aluminium is inherently non-combustible — it doesn’t need a test to become non-combustible; it simply is. Testing to AS 1530.1 confirms what the material’s properties already demonstrate. This is why solid aluminium cladding, including Valmond & Gibson’s element13 and interloQ systems, meets the DtS non-combustibility requirement without qualification.
The Verification Method: AS 5113 (CV3)
The NCC also provides a Verification Method — specifically CV3, which references AS 5113 — Fire Propagation Testing of External Walls. This is a full-scale test of an entire wall assembly, and it’s important to understand what it is, what it isn’t, and why most of the industry doesn’t use it.
AS 5113 tests a complete wall system — cladding, insulation, cavity, fixings, membrane, the lot — by exposing it to a simulated fire and measuring heat release and flame propagation. It was introduced to provide a pathway for wall assemblies that include some combustible components (certain insulation types, membranes, or coatings) to demonstrate acceptable fire performance as a system.
However, there are practical realities that limit its use:
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Cost — A single AS 5113 test can cost upwards of $100,000, and any change to the assembly (different insulation, different cavity depth, different fixing method) requires a new test.
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Specificity — The result applies only to the exact assembly tested. It doesn’t cover variations, substitutions, or alternative configurations.
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It doesn’t equal compliance on its own — The ABCB has confirmed that passing AS 5113 alone does not demonstrate full NCC compliance. The Verification Method is one piece of a broader compliance assessment that a fire engineer must evaluate.
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Rarely used — In practice, very few projects in Australia rely on AS 5113 results. The overwhelming majority use the DtS path via AS 1530.1, because it’s simpler, more certain, and more practical.
This isn’t a criticism of AS 5113 — it serves a legitimate purpose for assemblies that genuinely need system-level testing. But it’s important that specifiers and builders understand it for what it is: a specialised tool, not a standard compliance pathway. Most cladding suppliers — including Valmond & Gibson — use the DtS route because their products are inherently non-combustible materials. That’s normal, and it’s the approach the NCC was designed around.
Type A vs Type B vs Type C Construction
The NCC classifies buildings into construction types based on their size, height, and use:
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Type A — the most stringent. Typically buildings over 25 metres effective height, or buildings of certain classifications (e.g., Class 2, 3, and 9 above 4 storeys). External wall requirements are tight.
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Type B — moderate requirements. Covers many mid-rise buildings. External walls still need to meet fire performance criteria, but some concessions apply depending on the specific DtS provisions.
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Type C — the lightest requirements. Typically low-rise buildings. Fewer restrictions on combustibility, though other performance requirements still apply.
The practical effect: if you’re working on anything multi-storey in Australia, the external cladding question is almost certainly one you need to get right from a non-combustibility perspective.
Beyond Combustibility: What Else the NCC Requires
Fire performance gets the headlines, but the NCC’s requirements for external walls extend well beyond combustibility. Specifiers need to account for several additional performance criteria — and reputable suppliers should be able to provide evidence across all of them.
Weatherproofing
NCC provisions require external walls to prevent water penetration that could cause damage to building elements or loss of amenity. The referenced testing standard for facade systems is AS/NZS 4284:2008 — Testing of building facades. This is a rigorous standard that tests for air infiltration, water penetration, and structural adequacy under simulated wind loads.
For context, Valmond & Gibson’s interloQ system has been tested to AS/NZS 4284:2008 for weatherproofing performance at 900 Pa service pressure — tested and reported by Ian Bennetts & Associates (Report 2022-031-S1). That 900 Pa figure represents significant wind loading, well above what most facade installations will experience in service.
Impact Resistance
External cladding needs to withstand in-service loads — wind pressure, live loads, and impact. The NCC addresses impact resistance through provisions like C1.8, which sets performance criteria for resistance to impact from external sources.
Valmond & Gibson’s element13 panels were tested to NCC C1.8 impact requirements by Ian Bennetts & Associates (Report 2021-083). The results: 18.87mm deflection against a 30mm limit, and 0.04mm residual deformation against a 0.5mm limit. Both comfortably within the code requirements — and the kind of margins that give facade engineers confidence in the system’s robustness.
Durability and Maintenance
The NCC requires that building materials and systems maintain their performance over their intended service life. For cladding, this means considering UV stability, corrosion resistance, moisture performance, and maintenance access. These aren’t typically tested to a single standard — they’re addressed through material selection, design detailing, and manufacturer guidance.
How to Verify That a Cladding Product Is Non-Combustible
Verifying compliance is not as simple as taking a supplier’s word for it. Here’s what to look for:
1. AS 1530.1 Test Report
Ask for a current test report from an accredited laboratory — typically a NATA-accredited facility in Australia. The report should test the specific product being supplied, not a generic material. A test on “3mm aluminium” doesn’t automatically cover a different alloy, finish, or manufacturing process.
As an example of what this looks like in practice: Valmond & Gibson’s solid aluminium products are tested to AS 1530.1 and confirmed non-combustible. The testing is specific to the products supplied, and the certificates are available on request. This is the standard the industry should expect from any supplier making non-combustibility claims.
2. CodeMark or Other Third-Party Certification
Some products carry CodeMark certification, which provides independent evidence of NCC compliance. While CodeMark is not mandatory, it’s a useful shortcut for specifiers looking for pre-assessed compliance evidence.
3. Product Technical Manual
A well-documented product should come with a technical manual covering installation, compliance testing references, and performance data. If a supplier can’t provide this, that’s a signal worth paying attention to.
4. Supply Chain Traceability
Can the supplier demonstrate that the material arriving on site is the same material that was tested? This is particularly relevant for aluminium products, where alloy grade, thickness, and coating can all affect the test result. Responsible suppliers maintain traceability from testing through to delivery.
Why This Matters Beyond Compliance
The cladding crisis — from Grenfell Tower in London to Lacrosse in Melbourne — demonstrated that non-compliance with fire performance requirements has real consequences. Lives are at risk when combustible materials are used in external walls on buildings where non-combustible materials are required.
Beyond life safety, there are significant financial and legal exposures. Building owners with combustible cladding face remediation costs, insurance complications, and in some jurisdictions, mandated rectification programs. Specifying compliant materials from the outset is not just a regulatory obligation — it’s risk management.
State-based programs like Cladding Safety Victoria and NSW’s Project Remediate have made it clear that regulators are taking enforcement seriously. The industry is responding, but the volume of buildings requiring rectification remains substantial.
Choosing Non-Combustible Cladding: Practical Considerations
When selecting a non-combustible cladding system, compliance is the baseline — not the finish line. Other factors that matter in practice include:
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System design — How does the cladding attach? Is it a direct-fix system, a rainscreen, or a cassette system? Each has implications for weatherproofing, thermal performance, and installation efficiency.
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Durability — What’s the expected service life? How does the material perform in coastal, industrial, or high-UV environments?
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Finish options — PVDF and powder coat finishes offer different aesthetic and performance characteristics. The specification should match the project’s exposure conditions.
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Installation method — Concealed fixings, interlocking panels, and unitised systems each have different labour requirements and skill implications for the installer.
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Documentation — Does the supplier provide installation manuals, engineering data, and ongoing technical support?
These aren’t secondary considerations. A product that’s non-combustible but poorly designed, poorly documented, or poorly supported creates different problems — but problems nonetheless.
What’s Ahead
The regulatory environment around cladding in Australia continues to evolve. The NCC is reviewed and updated on a regular cycle, and each edition has tended to tighten rather than loosen the requirements around external wall fire performance. Specifiers and installers who stay current with these changes are better positioned to deliver compliant work efficiently.
The broader direction is clear: non-combustible cladding is the expectation for multi-storey buildings in Australia. Understanding what that means in practice — from material testing to the DtS compliance pathway to supply chain traceability — is fundamental to working confidently in this space.
Valmond & Gibson’s element13 and interloQ are 3mm solid aluminium cladding systems, tested non-combustible to AS 1530.1. For technical documentation or to discuss a project, get in touch.
Related Reading
- AS1530.1 Explained: Non-Combustible Cladding in Australia
- Non-Combustible vs Fire Retardant: The NCC Distinction
- Solid Aluminium vs Composite Panels
- Evidence of Suitability Under NCC 2022: What Certifiers Actually Need
Last updated: 10 February 2026