Appendix F - Bushfire Hazard Assessment and Managment Report

Bushfire Report


3.3 AS 3959:2018 Construction of Buildings in Bushfire-Prone Area
Where development is proposed in designated bushfire prone areas, AS 3959:2018
provides construction requirements designed to enhance resistance against bushfire
attack. These construction specifications are determined by specific heat flux
exposure thresholds and are categorized into six Bushfire Attack Levels (BAL):

                             Radiant Heat
 Bushfire Attack Level                                        Description of Predicted
                              Exposure
        (BAL)                                         Bushfire Attack and Levels of exposures
                            (AS3959:2018)
                                                  Minimal attack from radiant heat and flame due to
                                                  the distance of the building from the vegetation,
       BAL – Low              Insignificant
                                                  although some attack by burning debris is possible.
                                                  There is insufficient threat to warrant specific
                                                  construction requirements

                                                  Attack by burning debris is significant with radiant
                                                  heat (not greater than 12.5kW/m²). Radiant heat is
       BAL - 12.5           0 to 12.5kW/m2        unlikely to threaten building elements (such as
                                                  unscreened glass). Specific construction
                                                  requirements for ember protection and accumulation
                                                  of debris are warranted.

                                                  Attack by burning debris is significant with radiant
                                                  heat flux (not greater than 19kW/m²) threatening
        BAL - 19           12.5 to 19kW/m2
                                                  some building elements (such as screened glass).
                                                  Specific construction requirements for embers and
                                                  radiant heat are warranted.

                                                  Attack by burning debris is significant and radiant
                                              2   heat flux (not greater than 29kW/m²) threatens
        BAL – 29            19 to 29kW/m
                                                  building integrity. Specific construction requirements
                                                  for ember and higher levels of radiant heat are
                                                  warranted. Some flame contact is possible.

        BAL – 40            29 to 40kW/m2         Radiant heat flux and potential flame contact could
                                                  threaten building integrity.


                             40kW/m2 plus         Significant radiant heat and significantly higher
        BAL - FZ                                  likelihood of flame contact from the fire front will
                           (Flame Contact)        threaten building integrity and result in significant
                                                  risk to residents.



             Table 1: AS3959:2018 Using BAL to determine construction requirements



3.4 Noosa Shire Council Planning Scheme
The Bushfire Hazard Overlay, under the Council’s Planning Scheme reflects SPP
State and Local level interests by identifying designated bushfire prone areas. Where
assessable development is proposed on land mapped as containing bushfire hazard
areas, a site-specific bushfire hazard assessment prepared in accordance with the
planning scheme is required.


Max Bushfire Protection Consulting                                                                        14