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9.23.11.3.(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: 
Minimum number of top wall plates in loadbearing stud walls, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
Exceptions: 
except as stated in Sentences 9.23.11.3.(2) to (4), which apply where studs are directly beneath the supported framing above, or where lintels provide the required support.
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Intent
Intent 1: 
To limit the probability of inadequate capacity to transfer loads from supported floor and roof framing members, which could lead to an inability to resist expected gravity and lateral loads, which could lead to:
  • the inadequate distribution of vertical loads to and from studs, which could lead to the excessive deflection of wall plates, or
  • inadequate diaphragm action of plates, which could lead to the excessive deflection of walls.
Where walls support floors, this is to limit the probability of:
  • the excessive deformation of floors, which could lead to compromised operation of doors required for egress in an emergency, or
  • the excessive deflection or vibration of floors, which could lead to persons losing their balance, tripping or falling.
This is to limit the probability of harm to persons.
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