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Bushfire Resisting Timbers

2/7/2017

 
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Australia has a number of high density timbers that provide an inherent natural bushfire resistance Seven of these are defined by AS 3959–2009 as bushfire-resisting timbers (BRTs). They are solid, dense hardwoods that performed well in extensive fire testing.

The timber species have been tested and found to meet the required parameters without having to be subjected to fire retardant treatment. There are 7 hardwoods recommended by the building commission for bushfire prone areas
  1. Spotted Gum
  2. Red Ironbark
  3. Blackbutt
  4. Turpentine
  5. Merbau
  6. River Red Gum
  7. Silvertop Ash

Jarrah has bushfire resistance properties (BAL 12.5 and 10 per all AS3959 applications; BAL 29 when used in conjunction with non-combustible wall cladding and enclosed subfloor. Exova Warrington have issued a fire Certificate of Assessment - BAL‒29 assessment of tested jarrah and karri decking used on a deck with an enclosed subfloor adjacent to non-combustible wall cladding in accordance with AS1530.8.1-2007 as appropriate for decks. 

This site gives a nice summary of decking timbers.

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