Bushfire Resistant Timber Cladding

The BAL ratings consider various factors that influence the risk posed by a fire, such as the specific vegetation, the proximity of a property to the vegetation, wind speed, and slope of the surrounding land. The lower BAL rating levels (BAL-Low to BAL-12.5) generally require preparation related to fuel reduction near the property and building material selection. The higher levels (BAL-19 to BAL-FZ) require additional measures like thicker glass windows, specific gutter guard systems, and water storage provisions.

It’s important to note that BAL ratings can vary by location, specific property, and a range of individual factors. Builders should seek professional guidance to identify a property’s specific BAL rating to ensure compliance with local standards and requirements.

The requirements include factors such as roof design, windows, and the areas surrounding the property, including vegetation and buffer zones.”

How BAL Affects Material Selection
The BAL rating dictates the materials and design elements to consider when constructing in a bushfire-prone area. For instance, from a BAL rating of 19 and upwards, external walls must be made from specific materials—namely, non-combustible materials or bushfire-resistant timber.

Non-combustible materials, such as steel, must be used for roofing materials in buildings with a BAL-40 rating. Roofs with a BAL rating of 12.5 and up must be fully sarked, and the junction between the roof and walls must be completely sealed.

Glass openings, including windows and doors, should use thicker, toughened glass and frames made from materials that match the criteria of the corresponding BAL rating. 

Decks should be made with non-combustible materials or fire-resistant cladding, depending on the required BAL rating. They should be built as standalone structures, not directly connected to the house, to ensure that if they ignite, they can detach from the house and reduce the chances of spreading fire into the main structure.