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Calculating the Bushfire Attack Level (BAL)

Burning house

There are two methods for determining BALs: Method 1—A simplified procedure that involves five steps listed in AS3959 or PBP2019 to determine BALs, which is subject to limitations on the circumstances in which it can be used. Method 2—A detailed procedure, set out in Appendix B (AS3959), using calculations to determine BALs, appropriate where a more specific result is sought or where the site conditions are outside of the scope of Method 1. BALs are used to determine which, if any, construction requirements contained in Sections 3 to 9 of the Australian Standard are appropriate for a particular site.