Main Menu

Bushfire Screening

What is Bush Fire Protection?

Bush fire Protection is the protection of buildings, as specified in the Australian Standard AS3959-2009 “Construction of buildings in bushfire-prone areas“, against burning embers, radiant heat or flame generated by a bushfire. The 2009 edition of AS 3959 explains Bushfire Attack Levels (BALs) as follows.

SCREENING REQUIREMENTS

BAL DESCRIPTION SUITABLE MESH
12.5 Screens for windows and doors shall have a mesh or perforated sheet with a maximum Aluminium, Bronze or Stainless steel
Aperture of 2mm, made of corrosion-resistant steel,bronze or aluminium. Gaps between
The perimter of the screen assembly and the building element to which it is fitted shall not
Exceed 3mm.The frame supporting the mesh or perforated sheet shall be made from metal
or bushfire resistant timber.
BAL 19 Same as Above Aluminium, Bronze or Stainless steel
BAL 29 Same as Above Aluminium, Bronze or Stainless steel
BAL 40 Screens for windows and doors shall have a mesh or perforated sheet with a maximum
Aperture of 2mm, made of corrosion-resistant steel or bronze. Gaps between
The perimter of the screen assembly and the building element to which it is fitted shall not Bronze or Stainless steel
Exceed 3mm.The frame supporting the mesh or perforated sheet shall be made from metal. Bronze or Stainless steel
BAL FZ Same as Above Bronze or Stainless steel

Explaining the numbers:

  1. BAL – Low The risk is considered to be Very Low
  2. BAL – 12.5 (protection from ember attack and radiant heat up to and including 12.5kW/m²) there is a risk of ember attack. The risk is considered to be Low
  3. BAL – 19 (protection from ember attack and radiant heat greater than 12.5kW/m² up to and including 19 kW/m²) There is a risk of ember attack and burning debris ignited by wind borne embers and a likelihood of exposure to radiant heat. The risk is considered to be Moderate
  4. BAL – 29 (protection from ember attack and radiant heat greater than 19 kW/m² up to and including 29 kW/m²) There is an increased risk of ember attack and burning debris ignited by windbourne embers and a likelihood of exposure to an increased level of radiant heat. The risk is considered to be High
  5. BAL – 40 (protection from ember attack, increased likelihood of flame contact and radiant heat greater than 29kW/m² up to and including 40 kW/m²) There is a much increased risk of ember attack and burning debris ignited by windbourne embers, a likelihood of exposure to a high level of radiant heat and some likelihood of direct exposure to flames from the fire front. The risk is considered to be very high
  6. BAL – FZ (protection from flame contact, together with ember attack and radiant heat of more than 40 kW/m²) There is an extremely high risk of ember attack and burning debris ignited by windborne embers, and a likelihood of exposure to an extreme level of radiant heat and direct exposure to flames from the fire front. The risk is considered to be Extreme

Quick Contact Form

Complete this form and we will call you back!
  • This field is for validation purposes and should be left unchanged.

Showroom & Head Office

Get in touch with us. We can’t wait to renovate your house

  • This field is for validation purposes and should be left unchanged.

"These days it is hard to find reliable tradesmen but when you do you hold onto them and highly recommend them."

GET A FREE QUOTE