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I have noticed the letters BAL appear when I am looking at bush fire rated windows. What does BAL stand for?

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.

Posted in: General FAQs

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Bushfire Attack Levels

In the Australian Standards As 3959, they have classified different bushfire intensity levels that a home may experience during a bushfire.

These are referred to as Bushfire Attack Levels, or BAL’s for short.

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