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9.23.9.9.(2)
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: 
Allowable loads for cantilevered lumber floor joists supporting roof loads and loads from other storeys, 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 overloading cantilevered floor joists, which could lead to excessive bending moments, which could lead to an inability to resist expected roof loads, which could lead to the excessive movement, deformation or failure of floor or roof assemblies.
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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