If you live on the Sunshine Coast hinterland in areas like the Glass House Mountains, Maleny, Montville, Kenilworth, Pomona, or anywhere with bush on the boundary, bushfire isn’t an abstract risk. It’s something you think about when the wind picks up in dry season, when you smell smoke on the horizon, and when you start reading your council’s planning overlays more carefully than you used to.
One question we hear more and more from homeowners in these areas: “If I already have Crimsafe, does it help in a fire?” And increasingly from those building new: “Can I use Crimsafe to meet my bushfire building requirements?”
The honest answer is: yes – significantly, but with important nuances that are worth understanding properly. This post covers what Crimsafe actually does in a fire, the testing behind it, how it fits into Australia’s Bushfire Attack Level system, and where its limits are.
Important: This post is intended to inform and educate, not to substitute for a site-specific bushfire assessment. If your property carries a BAL rating or falls within a bushfire hazard overlay, always work with a qualified fire safety engineer or building certifier. We’re happy to discuss Crimsafe’s fire performance as part of your project – contact our team for guidance.
First, Understand How Bushfires Actually Damage Homes
To understand what Crimsafe does, and doesn’t do, in a fire, you first need to understand how bushfires typically cause damage to buildings. Research consistently shows three main attack vectors:
1. Ember Attack
This is the most common and, in many ways, most insidious cause of home loss in bushfires. Burning embers can travel kilometres ahead of the fire front, landing on roofs, in gutters, under decks, and critically, entering homes through gaps in windows, vents, and door frames. Once inside, a single ember on a curtain or carpet can start an internal fire that destroys the home even before the fire front arrives.
2. Radiant Heat
As a fire front approaches, the intense heat it radiates can cause windows to crack, glass to fail, and combustible materials on the outside of your home to ignite, even without the flames making direct contact. This is why standard glass is such a vulnerability in bushfire-prone homes.
3. Direct Flame Contact and Flying Debris
At the most severe end, direct flame exposure and burning debris, tree branches, airborne material, can directly strike and breach openings in a home. This is the threat addressed by the highest BAL ratings.
Windows and doors are the most vulnerable openings in a home during a bushfire event. They’re where all three of these threats converge. This is exactly where Crimsafe operates.
What Crimsafe Actually Does in a Fire
Crimsafe screens are made from Tensile-Tuff® mesh, a tightly woven 304 grade stainless steel mesh with an aperture size of less than 2mm. That mesh size, combined with the stainless-steel construction, delivers specific and tested fire performance benefits:
Ember Blocking
The Australian Standard AS3959-2009 (Construction of buildings in bushfire-prone areas) requires that screening over openings be made from corrosion-resistant steel, with an aperture that will not allow a circular probe of 2mm diameter to pass through. Crimsafe’s mesh aperture is less than 2mm, meaning it meets this requirement across all BAL levels. In practice, this means Crimsafe screens act as a physical barrier to floating embers at windows and doors – the single most important entry point for ember-related house fires.
Radiant Heat Reduction
This is where Crimsafe’s performance is particularly impressive. When placed over a window opening, Crimsafe screens have been independently tested by CSIRO and found to reduce the intensity of radiant heat by up to 59%. For context: it’s radiant heat that causes standard window glass to fail. A Crimsafe screen placed over that glass dramatically reduces the heat load reaching the glazing, significantly delaying or preventing glass failure.
Crimsafe is formally recognised as an ‘alternative solution’ for fire attenuation under Australian building standards. This means it can be specified and approved as a fire protection measure, not just incidentally – when signed off by a qualified fire engineer or building certifier.
Protection from Flying Debris
Because the Crimsafe mesh is locked into its frame using the patented Screw-Clamp® technology, the screen holds together under impact, including the impact of burning debris such as tree branches. The stainless-steel construction means there are no plastic components that could melt under heat exposure and compromise the integrity of the screen.
Summary: Crimsafe screens block embers, reduce radiant heat by up to 59% (CSIRO tested), and physically protect glazing from the impact of debris – all without any plastic parts that could melt and fail under heat.
What Is a BAL Rating and Does Your Sunshine Coast Property Have One?
Before we get into how Crimsafe maps to each level, it’s worth explaining what a Bushfire Attack Level is, because it’s a term that gets used a lot in building conversations without always being clearly explained.
The Short Version
A BAL rating is a site-specific measure of how much bushfire risk a property is exposed to. It takes into account the type and density of surrounding vegetation, how close that vegetation is to the building, the slope of the land, and the fire weather conditions typical of the region. The result is one of six classifications, ranging from BAL-LOW (minimal risk) through to BAL-FZ, which stands for Flame Zone – the most severe level, meaning the site could be directly exposed to flame contact.
The rating directly determines what construction standards apply to new buildings or significant renovations on that site, under Australian Standard AS3959-2009 (Construction of buildings in bushfire-prone areas). The higher the BAL, the more stringent the requirements – covering everything from wall cladding and roofing to window glazing, vents, and, critically for our purposes, screening over openings.
How Is a BAL Determined?
A BAL assessment is carried out by a qualified bushfire consultant or, in some cases, a building certifier. It involves a site inspection and assessment against the methodology set out in AS3959. In Queensland, if your property falls within a mapped Bushfire Hazard Overlay under the relevant council planning scheme, a BAL assessment is required as part of any development application. You can’t self-assess for compliance purposes; it needs to be done formally and documented.
The Sunshine Coast Specifically
The Sunshine Coast has significant mapped bushfire hazard areas, and many homeowners are surprised to discover their property is within one. The Sunshine Coast Planning Scheme 2014 identifies areas subject to medium and high bushfire hazard, and the affected areas are not limited to deep rural properties. Semi-rural lots, lifestyle acreage, and homes on the edges of hinterland townships can all fall within the overlay.
Areas commonly affected include the Glass House Mountains, Maleny, Montville, Mapleton, Kenilworth, Pomona, Cooroy, and the broader hinterland corridors. But the overlay isn’t limited to hinterland properties, coastal suburbs with adjacent bush corridors are captured too. Peregian Beach and Peregian Beach South both appear in the Queensland Fire and Rescue Service’s Sunshine Coast Bushfire Risk Analysis mapping, a reminder that BAL risk exists closer to the coast than many homeowners assume.
That said, being in a suburb that appears on the risk map doesn’t automatically mean every property within it carries a BAL rating requiring construction compliance. It depends on the specific lot, its proximity to vegetation, the slope of the land, and the density of surrounding bush. A Peregian property that backs directly onto a bush corridor is in a very different position to one surrounded by established suburban development a few streets away. A formal site assessment is the only way to know for certain.
The Queensland Fire Department provides a publicly accessible postcode checker that gives an indication of bushfire potential in your neighbourhood, it won’t give you a BAL rating, but it’s a useful starting point to understand whether your area carries elevated risk. The definitive answer for compliance purposes requires a formal assessment.
Quick check: Visit fire.qld.gov.au/postcode-checker to see the bushfire potential for your Sunshine Coast suburb. If the map shows medium or high potential in your area, it’s worth talking to your building certifier about whether a formal BAL assessment applies to your property or planned works.
Why does this matter for screens and doors? Because once a BAL is assigned to your property, the screening over your windows and doors is one of the elements that must comply. That’s directly where Crimsafe comes in.
Crimsafe and the Bushfire Attack Level (BAL) System
Here’s how Crimsafe maps to each of the six BAL classifications and what that means in practice:
| BAL Level | Risk Description | Crimsafe Suitable? | Key Notes |
| BAL-LOW | Minimal bushfire risk | Yes | No specific construction requirements. Standard Crimsafe installation applies. |
| BAL-12.5 | Ember attack + radiant heat up to 12.5 kW/m² | Yes | Crimsafe meets AS3959 screening requirements on all windows, hinged, bi-fold and sliding doors. |
| BAL-19 | Ember attack + radiant heat up to 19 kW/m² | Yes | As above. Crimsafe’s ember-blocking mesh and radiant heat reduction are well suited to this level. |
| BAL-29 | Ember attack + radiant heat up to 29 kW/m² | Yes | Crimsafe continues to perform. Additional consideration for glazing specification behind the screen is advisable. |
| BAL-40 | Ember attack + likely flame contact + heat up to 40 kW/m² | Yes | Crimsafe meets requirements. Glazing specification behind the screen becomes increasingly important at this level. |
| BAL-FZ | Direct flame contact + ember attack + heat >40 kW/m² | Yes* | Crimsafe can be used, BUT only on a window system tested to a Fire Rating Level of -/30/- or compliant with AS1530.8.2 when tested from outside. Fire Engineer/Certifier sign-off required. |
* BAL-FZ is the most severe classification. Crimsafe can still be used at this level, but the glazing system it sits over must meet specific tested fire-rating requirements. This is a whole-system assessment, not just the screen in isolation. A qualified fire safety engineer or building certifier must be involved in any BAL-FZ specification.
What Crimsafe Cannot Do in a Fire
Being honest about this is as important as explaining what Crimsafe can do. A Crimsafe screen is not a fire-rated wall, door, or barrier in the traditional building sense. There are clear limits:
- It cannot protect against direct flame contact indefinitely. At extreme heat levels and prolonged direct flame exposure, even stainless steel will ultimately be compromised.
- At BAL-FZ, it cannot work alone. The window glazing system it sits over must independently meet fire-rating requirements. Crimsafe over standard float glass is not a compliant BAL-FZ solution.
- It does not protect other parts of the building. Roofing, vents, gutters, subfloor areas, and wall cladding all have separate requirements under AS3959. Crimsafe over your windows and doors is one important layer, not a whole-home solution on its own.
- Approval at higher BAL levels requires professional sign-off. Crimsafe’s status as an ‘alternative solution’ for fire attenuation means a Fire Safety Report from a Fire Protection Engineer or Certifier is required. That assessment is site and application specific.
Crimsafe significantly enhances a home’s resilience in a bushfire event, but it is one layer of a broader approach. Never rely on any single product as your sole protection strategy. Consult a qualified fire safety professional for site-specific advice.
Is the Sunshine Coast a Bushfire Risk Area?
Many Sunshine Coast homeowners are surprised to learn how much of the region falls within bushfire hazard overlays. The Sunshine Coast Regional Council’s 2014 Planning Scheme identifies areas subject to medium and high bushfire hazard, and the hinterland contains some of the most at-risk locations in South East Queensland.
Areas including the Glass House Mountains, Maleny, Montville, Mapleton, Kenilworth, Pomona, and surrounding rural and semi-rural corridors are well documented as carrying elevated bushfire risk. The 2019–2020 bushfire season, which affected parts of the D’Aguilar Range and Sunshine Coast hinterland, was a reminder that fire risk in this region is real and can escalate rapidly in dry conditions.
If your property is within a mapped bushfire hazard area on the Sunshine Coast, any new building work or renovation triggering a development application will typically require a Bushfire Hazard Assessment and, where relevant, construction to the applicable BAL standard. You can check your property’s bushfire overlay status through the Sunshine Coast Council’s planning tools or the Queensland Fire Department’s postcode checker.
Not sure whether your property falls within a bushfire hazard overlay? Check via the Sunshine Coast Council’s planning maps or the Queensland Fire Department’s postcode checker at fire.qld.gov.au/postcode-checker.
Beyond Bushfires: Crimsafe’s Year-Round Benefits
One of the reasons Crimsafe is such a compelling choice for Sunshine Coast hinterland homes, as opposed to traditional bushfire shutters or bars, is that it earns its value every single day, not just during fire season.
Homes in the hinterland often don’t need the level of urban security screening that a coastal suburb might, but they absolutely benefit from:
- Security: Crimsafe’s Tensile-Tuff® mesh and Screw-Clamp® technology deliver tested protection against forced entry, independent of any fire application.
- Insect protection: In rural and semi-rural settings, insect pressure is significantly higher. The sub-2mm mesh aperture keeps out mosquitoes, flies, and other insects while maintaining full airflow, no separate fly screen needed.
- Solar heat reduction: Crimsafe blocks up to 53% of solar heat gain, relevant in hinterland homes that can receive intense western and northern sun exposure through summer.
- Cyclone debris protection: Wide ranges of Crimsafe products are approved for cyclone regions C and D, relevant for properties in exposed elevated hinterland positions.
This combination; security, fire attenuation, insect protection, and solar performance, in a single, professionally installed product makes Crimsafe genuinely different from purpose-built bushfire shutters that offer fire protection but nothing else year-round.
Why a Licensed Manufacturer Matters for Bushfire Applications
Crimsafe’s fire performance is tied to correct specification and installation. The tested results, the 59% radiant heat reduction, the ember blocking, the BAL compliance, are achieved when the product is fabricated and installed to Crimsafe’s specifications.
As a licensed Crimsafe manufacturer on the Sunshine Coast, North Coast Blinds & Security fabricates every screen here, to Crimsafe’s exact requirements. This isn’t just a quality assurance point, in the context of bushfire compliance, it’s directly relevant. An improperly installed screen, or a screen that looks like Crimsafe but isn’t manufactured to specification, may not perform as the tested product does.
If you’re specifying Crimsafe for a bushfire application at higher BAL levels, we can provide the product documentation and installation records that a fire engineer or certifier may need as part of their assessment.
Related reading: What Is a Licensed Crimsafe Manufacturer and Why Does It Matter? explains the difference between a licensed manufacturer and a standard supplier or installer.
Questions About Crimsafe for Your Property?
Whether you’re building new in a bushfire zone, upgrading an existing hinterland home, or simply want to understand how your current Crimsafe screens perform in a fire, we’re happy to talk it through. We know the product, we know the Sunshine Coast, and we work alongside certifiers on bushfire-rated projects.
Get in touch with the team at North Coast Blinds & Security for an obligation-free conversation.