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9.23.13.10.(2)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Minimum depth of lumber ceiling joists supporting struts or dwarf walls that in turn support roof rafters, where the roof slope is 1 in 4 or less, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
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Intent
Intent 1: 
To limit the probability of inadequate strength, which could lead to an inability to resist bending stress imposed by struts or dwarf walls in addition to other expected gravity and lateral loads, which could lead to:
  • the failure of the roof or of the ceiling joists, or
  • the excessive deflection of the roof, which could lead to the opening of joints.
Where wood-frame construction supports or is part of an environmental separator, this is to limit the probability of the displacement or failure of required environmental separation elements, which could lead to:
  • condensation,
  • precipitation ingress,
  • excessive heat transfer,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.
This is to limit the probability of:
  • inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on 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.
Intent 2: 
To limit the application of Sentence (1) for constructions where support for increased roof loads has to be provided.
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