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9.3.2.9.(4)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F80,F61,F55-OH1.1,OH1.2] [F80,F61-OH1.3] Applies where cribbing or retaining walls support an environmental separator.
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 cribbing or retaining walls support an environmental separator, this is to limit the probability of the compromised performance of the building envelope, which could lead to:
  • condensation,
  • precipitation ingress, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of indoor air and surface temperatures, drafts, relative humidity, or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable upon wetting, or
  • deterioration, which could lead to further compromised integrity of environmental separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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