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9.3.2.9.(4)
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F80-OS1.2] Applies where cribbing or retaining walls support assemblies that are required to provide fire resistance.
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.
Where structural wood elements are used in assemblies that are required to provide fire resistance, this is to limit the probability of the compromised fire resistance of the assembly, which could lead to harm to persons.
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