BAL means Bushfire Attack Level. There are six Bushfire Attack levels from low to extreme. Information on BAL assessments are contained in the Australian Standard AS3959-2009 Construction of Buildings in Bushfire Prone Areas for further information please refer to this standard.
The following shows the six bushfire attack levels and their predicted risk levels:
BAL-Low: This is insufficient risk to warrant specific construction requirements – Risk Level -Very low.
BAL-12.5: Ember attack- Risk Level – Low.
BAL-19: This is insufficient risk to warrant specific construction requirements – Risk Level – Moderate.
BAL-29: Increasing levels of ember attack and burning debris ignite by windborne embers together with radiant heat exposure between 12.5 and 19kW/m2 – Risk Level – High.
BAL-40: Increasing levels of ember attack and burning debris ignite by windborne embers together with radiant heat exposure between 29 and 40kW/m2 – Risk Level – Very High.
BAL-FZ: Direct exposure to flames from fire front in addition to radiant heat exposure of Extreme greater than 40kW/m2 and ember attack- Risk Level – Extreme.
For more information on Bushfire Attack Levels, please click here.
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