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9.23.12.3.(1)
ApplicationIntent
OS2OP2OH1OH4OS1OS3
ObjectiveOS3 Safety in Use
Attribution
[F22-OS3.1] Applies to floors and elements that support floors.
[F22-OS3.7] Applies to walls, and elements that support walls, that contain doors or windows required for emergency egress.
Application
Application 1: 
Maximum spans for wood lintels, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.]:
  • in buildings of residential occupancy,
  • where wall studs exceed 38 mm by 64 mm in size,
  • where the spans of supported joists do not exceed 4.9 m, and
  • where the spans of trusses do not exceed 9.8 m.
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Intent
Intent 1: 
To limit the probability of excessively long spans, which could lead to an inability to resist expected gravity and lateral loads around openings.
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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