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9.3.2.9.(6)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS2 Structural Safety
Attribution
[F20,F60-OS2.3]
Application
Application 1: 
Protection of structural wood elements that have been treated with borates, where these elements are:
  • in termite-prone localities, where the clearance between structural wood elements and the ground is less than 450 mm or not all sides of supporting elements are visible,
  • in termite-prone localities, where a barrier is not installed through finish materials on insulated foundations or not all sides of the finished supporting assembly are visible,
  • in all localities, where the vertical clearance between structural wood elements and the ground is less than 150 mm,
  • in all localities, where
    • the wood elements are not protected from exposure to precipitation,
    • the configuration is conducive to moisture accumulation, and
    • the moisture index is greater than 1.00, and
  • in all localities, where structural wood elements are used in retaining walls and cribbing, and where
    • the retaining wall or cribbing supports ground critical to the stability of building foundations, or
    • the retaining wall or cribbing is greater than 1.2 m in height.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that performance, with respect to the protection of structural wood elements from termite infestation or decay, will fall significantly below expectations.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • where structural wood elements support or are used in an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
Intent 2: 
To limit the application of the standard to situations where the limited protection provided by borates will be adequate.
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