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9.3.2.9.(4)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS3 Safety in Use
Attribution
[F80-OS3.1] Applies where cribbing or retaining walls support floors.
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, 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, which could lead to compromised structural integrity.
Where the cribbing or retaining walls support floors, this is to limit the probability of excessive deflection or vibration of floors, which could lead to persons losing their balance, tripping or falling, which could lead to harm to persons.
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