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9.3.2.8.(1)
ApplicationIntent
OS2OP2OH4OH1OS1OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F20,F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Size tolerances for wood joists, rafters, lintels and beams, up to 5% less than the actual Canadian standard sizes, in 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 the failure to adjust spans for undersized joists, rafters, lintels or beams, which could lead to inadequate strength or rigidity, which could lead to an inability to resist expected gravity, lateral or wind uplift loads.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • where lumber supports or is used in an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
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