Reference Document - RAL26/0011 (As Published)

7. Hazard Mitigation Measures
Bushfire hazard mitigation requires an integrated approach of various best practices and mutually supportive protective
measures to protect against bushfire attacks. The following sections provide an integrated approach for the proposed
development to minimise risk to people and property and ensure that development is compatible with the level of bushfire
hazard present within the study area following State and Local policies. Figure 11 below details the various attack mechanisms
posed by bushfire hazards.

Figure 11 - Bushfire Attack Mechanisms on Houses (DELWP 2017)




7.9      Minimum Construction Standards
Based on the fire modelling undertaken per Method 2 of AS3959:2018 (as detailed in Section 6.8), The southern lot is exposed to
a maximum radiant heat level of under 10 kW/m² predominantly from HA1. As such, any future dwelling built within this area is
recommended to be constructed a minimum construction standards of BAL12.5 as per AS3959:2018. Any dwelling built outside
of the BAL10 contour does not require to be built to a minimum construction standard as the resultant distance from HA1
supplies adequate mitigation. Thus, the southern lot can achieve a tolerable level of bushfire, and protect from indirect impacts
of wildfire in HA1 or HA2 (i.e. smoke, ash, ember and burning debris attack mechanisms).

Table K - Effects of Radiant Heat Exposure (QFD 2019)
 Radiant Heat
 Flux (kW/m2)      Potential Effects
 Greater than 40   ▪    Unpiloted ignition of timber walls and fences
                   ▪    Direct flame contact likely
                   ▪    Extreme levels of radiant heat
 29-40             ▪    Failure to toughened glass
                   ▪    Direct flame contact is possible
                   ▪    Extreme levels of radiant heat
                   ▪    Unpiloted ignition of some timber species after prolonged exposure (e.g. several minutes)
 19                ▪    Failure to screened float glass
 16                ▪    Blistering of skin with > 5 seconds exposure
 12.5              ▪    Failure to plain glass
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