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9.4.3.1.(1)
ApplicationIntent
OS2OP2OH4OS3OH1
ObjectiveOS2 Structural Safety
Attribution
[F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Maximum deflection of roof rafters, roof joists, roof beams and roof decking of plank and beam construction, ceiling joists, floor joists, floor beams, and floor decking, beams, joists and decking for balconies, decks and other accessible exterior platforms, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of the excessive deflection of structural members.
This is to limit the probability of:
  • for roof framing, rainwater ingress, and
  • for roof framing, ceiling joists or floor framing supporting air barrier materials, vapour barriers or insulation, the displacement or failure of these elements, which could lead to condensation.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of roofs, walls or floors, or of elements supported or protected by roofs, walls and floors, which could lead to structural failure, which could lead to harm to persons.
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