Why bushfire resilience in Class 9 buildings matters
Bushfires are a growing threat across Australia, and the stakes are highest for our most vulnerable communities—children in early learning centres, students in schools, and elderly residents in aged care or hospitals. Ensuring occupant safety in Class 9 buildings during bushfire events has become a critical design consideration.
Recent disasters, such as the Black Saturday and Black Summer fires, have shown that traditional evacuation isn’t always possible for these groups. That’s why Australia’s building codes now require these facilities to be designed so people can shelter safely inside if evacuation isn’t an option.
But meeting these requirements isn’t always straightforward. The rules are complex, and the one-size-fits-all approach often doesn’t work for every site or building type. That’s where a smarter, performance-based approach can make all the difference.
How and why bushfire regulations have changed: The story behind Specification 43
In response to recent tragic events and new research , the National Construction Code (NCC) introduced Specification 43. It’s a set of rules specifically for Class 9 buildings in bushfire-prone areas. The aim? To make sure these buildings can withstand bushfire hazards and keep people safe, even in the most extreme scenarios.
Why the change?
- Vulnerable occupants: Many people in these buildings can’t always evacuate quickly or on their own.
- More frequent, severe bushfires: Climate change is making fire seasons longer and more intense.
- Gaps in old rules: Previous codes didn’t address the unique needs of schools, aged care, or hospitals in bushfire zones.
What does Specification 43 require?
If your building is in a bushfire-prone area, Specification 43 sets out detailed design and construction standards, including:
- Minimum distances from vegetation to reduce direct flame and radiant heat risks.
- Fire-resistant materials and construction to protect against embers and heat.
- Active and passive fire safety systems, including backup power for critical systems.
- Emergency access and water supplies for firefighting.
- Managing risks from nearby structures or combustible materials.
The goal: to ensure the building can provide a safe place to shelter in cases where evacuation isn’t possible.
The limits of the “Deemed-to-Satisfy” approach
What is Deemed-to-Satisfy (DTS)?
DTS provisions are essentially a checklist. If you follow every rule exactly, your building is considered compliant. For bushfire resilience, this means following Specification 43 to the letter.
But there are challenges:
- DTS only applies to moderate-risk sites: If your building’s Bushfire Attack Level (BAL) is above 12.5, DTS doesn’t apply; you must use a Performance Solution.
- Assumptions don’t always fit reality: DTS assumes every site is moderate risk, which isn’t always true for urban or semi-urban locations.
- Rigid requirements: The rules can be overkill for some buildings, leading to unnecessary costs or impractical designs.
- All areas treated the same: Even storage rooms must meet the same comfort standards as occupied areas, which isn’t always logical.
Why Performance Solutions are a smarter way forward
Performance Solutions offer a flexible, tailored alternative to the rigid DTS pathway. Instead of following a checklist, you work with experts to demonstrate that your design meets the requirements of the code, keeping people safe, but allowing for smarter, more cost-effective solutions.
What does a DDEG Performance Solution involve?
At DDEG, we guide you through a structured process to deliver a solution that’s both compliant and practical:
- Site-specific bushfire risk assessment
- We work with bushfire consultants to analyse your site’s unique risks—vegetation, slope, wind, and likely fire behaviour.
- We consider the actual use of your building (e.g. schools may be empty on high-risk days).
- Advanced fire modelling and engineering
- We use cutting-edge tools to predict how fire, heat, and smoke could impact your building.
- Our team models credible worst-case scenarios and tests how your design will perform, ensuring it meets both asset protection and occupant safety requirements.
- Design optimisation
- We collaborate with your architects, mechanical engineers, and other specialists to refine the design.
- We focus on solutions that balance safety, usability, and cost, avoiding unnecessary overengineering.
- Stakeholder engagement and approvals
- We liaise with authorities, fire brigades, and certifiers early to streamline the approval process.
- Our clear, well-documented reports make it easy for decision-makers to understand and approve your solution.
Real-world example
DDEG provided an alternative solution by showing that targeted bushfire resistant construction and site management could enable practical building placement, while maintaining alternative access for emergency services to meet the building code and regulatory requirements. Additionally, suitable evacuation pathways and external assembly areas were identified and verified to offer a higher level of safety than a typical DTS design.
Ongoing collaboration with the design team and bushfire risk experts ensured prompt fire brigade approvals without unexpected delays. This approach met safety goals, allowed the project to proceed, and resulted in cost savings for the construction budget.
What’s at stake if you get it wrong?
- Delays and cost blowouts: Rigid DTS requirements can force expensive redesigns or upgrades that may not be needed.
- Non-compliance risks: If you don’t meet the right standards, you could face approval delays, insurance issues, or even legal action.
- Safety and reputation: Above all, getting bushfire resilience wrong puts vulnerable people’s lives at risk, which could be catastrophic. It can also damage your organisation’s reputation.
Key takeaways for your next Class 9 project
- Don’t assume the standard rules will fit your site. Specification 43 is complex and often overly rigid.
- Performance Solutions give you flexibility and peace of mind. They allow for smarter, site-specific designs that still meet the highest safety standards.
- Early engagement is critical. Bring in bushfire and compliance specialists like DDEG early in your project to avoid costly surprises.
- Clear, practical advice saves time and money. DDEG’s expertise means you get a solution that’s robust, approved, and right for your needs.
Ready to make your building bushfire resilient?
If you’re working on a school, aged care facility, hospital, or any Class 9 building in a bushfire-prone area, DDEG can help you find the smartest path to compliance, without unnecessary cost or compromise.
Our team specialises in performance-based solutions that keep projects moving and people safe. Contact us today for a tailored bushfire compliance strategy, or to discuss your next project.