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9.23.9.9.(3)
ApplicationIntent
OS2OP2OH1OH4OS1OS3
ObjectiveOS3 Safety in Use
Attribution
[F22-OS3.1]
[F22-OS3.7] Applies to walls, and elements that support walls, that contain doors or windows required for emergency egress.
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,
  • where elements support or are part of an environmental separator, the failure of required environmental separation elements, which could lead to deterioration, or
  • an inability to resist expected loads, which could lead to:
    • the excessive deflection or vibration of floors, or
    • the excessive movement or deformation of walls.
This is to limit the probability of:
  • compromised operation of doors or windows required for egress in an emergency, and
  • persons losing their balance, tripping or falling.
This is to limit the probability of harm to persons.
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