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9.23.4.4.(3)
OS2OP2OH1OS1OH4OS3
ObjectiveOS2 Structural Safety
Attribution
[F20,F22-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Reduction in maximum spans for lumber beams or in maximum supported length of floor joists used to support floors with a concrete topping not more than 51 mm thick, in residential applications or where the live load on any floor does not exceed 1.9 kPa, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.].
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Intent
Intent 1: 
To limit the probability of excessively long spans of beams or joists, which could lead to beams being unable to resist the additional weight of a concrete topping, which could lead to excessive deflection or failure.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural collapse of wood-frame construction, or
  • where wood-frame construction supports or is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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