9.23.14.4.(3)

Objective

OH1 Indoor Conditions

Attribution

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 9.23.14.4.(2) where the roof framing on opposite sides of the peak is assembled separately.

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