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Non-Combustible Cladding: A Specification Guide for Architects and Builders
Non-Combustible Cladding: A Specification Guide for Architects and Builders
Non-combustibility has become one of the first questions in almost any multi-storey or commercial facade brief, and for good reason.
External wall fire spread has had real regulatory attention in Australia over the last decade, and the rules that came out of it are now a standard part of specification rather than a niche compliance issue.
This article is a starting point for the conversation, not a substitute for a certifier, fire engineer, or the current edition of the National Construction Code.
Compliance pathways depend on a number of factors, so always confirm the current requirements for your project rather than relying on general guidance alone.
What "Non-Combustible" Actually Means
In Australian building regulation, non-combustible is a defined test outcome.
Materials are assessed against AS 1530.1, the standard combustibility test used under the National Construction Code (NCC).
A material either passes this test and is deemed non-combustible, or it doesn’t.
You might hear “non-combustible”, “fire-retardant” and “fire-rated” used fairly loosely in general conversation, but they’re not interchangeable when it comes to compliance.
A fire-retardant coating can improve a timber product’s fire performance, but it’s solving a different problem to a material that’s non-combustible by nature.
Fire-rated is often used to describe a system’s Fire Resistance Level (FRL) — in other words, how long it will hold back fire and heat — which is a separate performance measure again, and applies more to whole wall or floor systems than to a single cladding product.
When a spec calls for a genuinely non-combustible material, it’s worth asking for the actual AS 1530.1 test report rather than relying on a product description alone.
Which Buildings This Actually Applies To
In broad terms, buildings required to be of Type A or Type B construction must have non-combustible external walls, including the facade covering, framing, and insulation.
What determines Type A, B or C construction?
– Your building’s Class. The NCC’s building-use categories, ranging from Class 2 apartments through to Class 9 healthcare and assembly buildings
– Your building’s rise in storeys
Broadly, the taller and higher-occupancy the building is, the more likely it is to fall into Type A or B and trigger the non-combustibility requirement. But the exact threshold varies, so you need to check against the current NCC tables for your specific project.
It’s worth flagging that houses (Class 1a) and simple outbuildings (Class 10) generally sit outside this framework. The requirement is specifically about the type of construction triggered by class and height, not a blanket rule that applies to every building over a certain number of storeys
Why the rule is structured this way
The logic makes sense once you break it down. Taller buildings and higher-occupancy building classes generally mean:
– Longer evacuation times
– More people at risk
– Less accessible firefighting response
Non-combustible external walls are one of several measures, alongside things like fire-resistance levels and compartmentation, that reduce the chance of a fire spreading up or across a facade before people can get out.
Deemed-to-Satisfy vs Performance Solutions
There are two ways to demonstrate compliance under the NCC.
The Deemed-to-Satisfy (DTS) pathway is the more prescriptive route. If your building requires Type A or B construction, the DTS provisions simply require the external wall and its components to be non-combustible, full stop. This is the pathway most projects default to because it’s straightforward to document and certify.
A Performance Solution is developed with a fire engineer to demonstrate that the building meets the underlying performance requirement (safe evacuation, limiting fire spread) through some other combination of design measures, rather than by meeting the DTS provisions item by item.
Once a Performance Solution is adopted for an element, the DTS type-of-construction framework doesn’t apply to that element in the same way, which is how some buildings retain combustible or partially combustible facade elements in situations where a strict DTS reading wouldn’t allow it.
This is a fire engineering exercise, though, not a workaround, and it needs to be led by a suitably qualified consultant.
Where Real Material Choice Still Exists
A DTS non-combustibility requirement doesn’t mean the facade has to look industrial or one-dimensional. You just need products with genuine, tested compliance, which still leaves architects with a real range of material and finish options across a few different product categories.
Aluminium cladding and battens
Non-combustible by nature. Modinex’s Alu Selekta Channel and Castelation Screenclad ranges are tested to AS 1530.1 and CodeMark certified, and are available in a wide range of solid powder coat colours as well as realistic timber-grain finishes if you’re looking for a warm, textured look without compromising on the non-combustibility requirement.
Concrete-look panels
A well-established category in its own right. Modinex’s Viroc range offers non-combustible properties suited to commercial, civic, education and multi-residential projects, with a raw, tactile finish that reads very differently to a typical aluminium or ACP facade.
What to Actually Look For in a Compliant Product
Given how much scrutiny cladding compliance has been under in Australia, it’s worth being a bit sceptical of “fire-safe” or “non-combustible” language on a spec sheet until it’s backed up. A few things genuinely worth asking for:
– An actual AS 1530.1 test report from a NATA-accredited testing laboratory
– Third-party product certification, such as CodeMark, which involves an independent certifier assessing the product against the NCC rather than the manufacturer self-declaring compliance
– Documentation specific to the exact product, finish and configuration you’re specifying. A coating or finish applied over a certified substrate can sometimes change the compliance position, so it’s worth confirming the certification covers the actual product build-up you intend to use, not just the base material
If any of this is unclear for a product you’re considering, that’s a reasonable thing to raise directly with the supplier or your certifier before it goes into a spec — it’s a much easier conversation to have at design stage than after documentation is submitted.
How Modinex Supports Specification
We carry test reports, CodeMark certification and technical documentation for our compliance-relevant ranges, and our team can talk through which products suit a given class, construction type or DTS/Performance Solution pathway.
If you’re working through a facade compliance question on a current project, it’s easier to loop us in while the design is still flexible rather than after a material’s already locked into the drawings.
For product-specific test reports, CodeMark certificates, or general guidance on non-combustible options for your project, get in touch with our team.
Article By Joel Leitch | July 2026
Joel Leitch
Project Consultant
Joel is an integral team member of NSW projects division with over a decade as a consultant to architects and builders. With extensive experience as a head of projects, Joel Leitch combines deep knowledge of natural timber, aluminium, and concrete to provide innovative and inspiring design solutions.
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