Not sure but here is some info
The requirements of AS 3959 are intended to improve the performance of buildings when subjected to bushfire attack. The standard applies to residential buildings and non-habitable buildings structures such as private garages, carports, sheds and decks associated with the main residential building, and considers such elements as:
? External doors, windows and screens
? Walls
? Roofs
? Flooring
? Eaves, gutters and downpipes
any associated structures such as garages, carports, decks or verandas that are attached or adjacent to your house will need to comply with the requirements of the BCA