BUSHFIRE ALERT RATINGS:
As a result of the 2009 devastating bushfires around the country, state governments have implemented new standards for preventative methods against Bushfire relating to the general construction of residential homes nationwide.
Guidelines are set based on the BAL (Bushfire Attack Level) rating given to each property. Using AS 3959 – 2009 local councils determine the BAL rating based on the proximity of each property to local bushland.
Understanding Bushfire Attack Levels:
- BAL – LOW: this level has no special construction requirements as there is such a low risk of Bushfire attack
- BAL – 12.5: this is principally concerned with protection from ember attack and radiant heat up to and including 12.5kW/m2 and where the site is less than 100m from the source of bushfire attack
- BAL - 19: this is principally concerned with protection from ember attack and radiant heat but at an increased level to a maximum radiant heat flux of up to 19kW/m2
- BAL – 29: This is identified as having an increased level of ember attack together with anincreased heat flux than BAL 19 , but not having heat flux greater than 29kW/m2
- BAL – 40 : Further increased load of ember and burning debris ignited by wind-borne emes; together with an increasing heat flux , but not greater that 4kW/m2. There is a likelihood of exposure to bushfire flames
- BAL – FZ is the top most exposure and has a direct risk to flames from the fire front. Ember attack and a heat flux is greater than 40kW/m2 and no upper heat flux is given
How does this effect the construction of windows?
Depending on the BAL (Bushfire Attack Level) rating, there certified timber specie, glass types, and screening methods to be followed.
Shamrock Joinery is a member of WADIC (Window and Door Industry Council Inc). WADIC have carried out extensive testing on windows and doors. As a result, they have come up with detailed guidelines to follow for the manufacture of timber windows and doors to comply with BAL ratings
Shamrock Joinery is certified to manufacture windows and doors with a BAL rating up to BAL – 29
Some certified timber species we use are:
- Spotted Gum
- Grey ironbark
- Kwila (Merbau)
- New Guinea Rosewood (up to BAL 19)
Shamrock Joinery glaze all windows and doors to comply with Australian Standard (AS 1288 – 2006)