windows & doors
windows & doors
Understanding Bushfire Ratings
Bushfire Attack Levels
- BAL – LOW
This is not a bushfire risk zone. There are no related construction requirements.
- BAL – 12.5
This zone is concerned with protection from radiant heat up to 12.5kW/m2. Ember attack and radiant heat are the main concerns, especially as sites may be less than 100m from the source of the bushfire attack.
- BAL – 19
This zone is mainly concerned with ember attacks and radiant heat up to 19kW/m2.
- BAL – 29
This zone has an increased risk of both ember attack and radiant heat over BAL 19 zones. The heat flux may be up to 29kW/m2.
- BAL – 40
This zone faces the same risks as BAL 29, with increased heat flux up to 40kW/m2. Burning debris is also a risk, as well as exposure to bushfire flames.
- BAL – FZ
This is the highest BAL rating. It has a high risk of exposure to bushfire flames on the fire front. There is a risk of ember attack as well as heat flux greater than 40kW/m2, with no upper limit to the flux that may be experienced.
Our Timber Species
- Spotted Gum
- Grey Ironbark
- New Guinea Rosewood (up to BAL 19)
- Manilkara (Pacific Jarrah)
Frequently Asked Questions
How does the BAL impact window construction?
Depending on the BAL of an area, there are specific types of timber and glass that must be used during the construction process.
How do I determine the best materials for my construction project with regards to the BAL in my region?
It is always recommended to speak with a professional who has experience with window construction in the region. Not only will such professionals understand the various materials on offer, but their knowledge of the BAL means they can inform you about the best options within your budget.