BAL Assessments & Reports
If a bushfire occurs, being prepared could make all the difference. A BAL Assessment ensures your property is prepared for a bushfire. Our Bushfire Consultants will assess the site of your development, and deliver an accurate and extensive BAL Assessment. We aim to reduce the impact of a bushfire, and keep you and your family safe in an emergency situation.
With over 50 years of experience, we’re expert Bushfire Consultants.
Perth is prone to bushfires. This is a fact. At Entire Fire Management, we have one priority–reducing the risks and effects of bushfires.
FPAA approved and BPAD accredited, we know Western Australian bushfire behaviour. We want to give your property an accurate and extensive BAL Assessment. Perth-focused and personalised, our recommendations will ensure bushfire safety in Western Australia.
BAL Assessments are required by law. If you’re a property owner looking to build, or a developer planning for the next subdivision within a bushfire prone area in Perth, BAL Assessments are the first step in determining the bushfire risks associated. A determined BAL rating will inform the construction of your new home to ensure the safety of its occupants. If you’re building or planning a new development in a bushfire prone area in Perth, BAL Assessments are essential for proposals that comply with the State Planning Policy 3.7 and the Australian Standard 3959 Construction of Buildings in Bushfire-Prone Areas (AS 3959).
What is a BAL? How high is my risk?
A BAL (Bushfire Attack Level) is a calculation of the potential exposure of a bushfire to a building or development, and the radiant heat potentially emitted.There are six BAL ratings (AS 3959):
- BAL-LOW – Low risk, no requirement to modify building design.
- BAL-12.5 – Maximum radiant heat output = 12.5 kW/m², exposed to ember attack.
- BAL-19 – Maximum radiant heat output = 19 kW/m², exposed to increasing levels of ember attack ignited by windborne embers together with increasing heat flux.
- BAL-29 – Maximum radiant heat output = 29 kW/m², exposed to increasing levels of ember attack ignited by windborne embers together with increasing heat flux.
- BAL-40 – Maximum radiant heat output = 40 kW/m², exposed to increasing levels of ember attack ignited by windborne embers, together with increasing heat flux and increased likelihood of exposure to flames.
- BAL-FZ – Direct exposure to flames from fire front, in addition to heat flux and ember attack.
As highly qualified Bushfire Consultants, we can prepare either a BAL Assessment-Method 1 or a BAL Assessment-Method 2. We also provide BAL Contour Maps (potential radiant heat impacts to any classified vegetation remaining on a site), if required. Entire Fire Management are happy to advise you on the most suitable method for your development.
BAL – Method 1
When preparing a BAL Assessment-Method 1, we:
- Conduct a site analysis of all the vegetation within 150 metres of the development location;
- Classify all vegetation types within the surrounding area;
- Measure the distances between the classified vegetation types and proposed building;
- Determine the effective slope under the classified vegetation plots;
- Calculate the BAL (Bush Fire Attack Level) of your building/proposed development; and
- Recommend appropriate construction requirements and/or provide a Bushfire Management Plan (link) and/or BAL Contour Map, if required.
A BAL Report-Method 2 is a comprehensive assessment using calculations for obtaining a more accurate BAL rating. Method 2 assessments are typically used when it is not possible to reduce a rating through mitigation methods within the boundaries of your own lot.
As part of BAL Assessment-Method 2, we:
- Determine the relevant Fire Danger Index or wind speed;
- Analyse the vegetation classification, fuel loads and vegetation height;
- Determine the effective slope under the classified vegetation;
- Calculate the slope of the land between the site and the classified vegetation;
- Measure the distance of the site from classified vegetation;
- Calculate the flame length;
- Calculate flame width;
- Determine the elevation of receiver;
- Calculate the radiant heat flux;
- Determine the BAL (Bushfire Attack Level) of your property/proposed property;
- Recommend appropriate construction requirements and/or implement a Bushfire Management Plan (link) and/or BAL Contour Map, if required.
Bushfire Attack Level (BAL) Contour Map
BAL Contour Maps are typically used in strategic planning proposals to illustrate the BAL ratings and potential impacts of a bushfire within larger lots, and help to highlight bushfire risk management measures that will reduce them.
*Higher BAL ratings may require a Bushfire Management Plan (link) to reduce the risks and effects of a bushfire.
We’re experienced Bushfire Consultants in Perth
The Western Australian Planning Commission recommends accredited Bushfire Consultants to complete a BAL Assessment and/or BAL Contour Map. BPAD accredited and FPAA approved, Entire Fire Management are leading Bushfire Consultants with over 50 years of experience. We take bushfires seriously. Our goal is to reduce the risks of bushfires, and keep Western Australian communities safe.