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9.23.13.4.(3)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Fastening together of lumber rafters at ridges of roofs where each half of the roof is assembled separately, such as for factory-built buildings, 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 the inadequate connection of rafters at ridges, which could lead to:
  • an inability to transfer expected gravity loads or positive wind loads at their upper ends, or
  • an inability to resist expected negative wind loads, which could lead to tension separation of roof peaks.
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 exempt situations from the application of Sentence 9.23.13.4.(2) where the roof framing on opposite sides of the peak is assembled separately.
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