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9.23.9.9.(3)
ApplicationIntent
OS2OP2OH1OH4OS1OS3
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.5]
[F22-OS2.5]
[F20,F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Minimum inward extension and fastening of cantilevered lumber floor joists that are installed at right angles to the main floor joists and that support roof loads, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], and that are:
  • cantilevered not more than 400 mm beyond their supports, where 38 mm by 184 mm joists are used, or
  • cantilevered not more than 600 mm beyond their supports, where 38 mm by 235 mm or larger joists are used.
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Intent
Intent 1: 
To limit the probability of:
  • inadequate leverage provided by the inboard portion of cantilevered joists,
  • inadequate resistance, by headers and fasteners, to upward reactions, or
  • inadequate fastening of the inboard portion of cantilevered joists.
This is to limit the probability of:
  • the excessive movement, deformation or failure of floor assemblies, or
  • the excessive deflection of the roof.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction, or
  • for exterior floors or floors supporting environmental separators, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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