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9.3.2.9.(4)
OS2OP2OH1OH4OS3OS1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Pressure treatment--with a preservative--of structural wood elements in retaining walls and cribbing, where:
  • the retaining wall or cribbing supports ground that is 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 of wood decay.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • where the cribbing or retaining walls support 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.
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