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9.23.14.5.(2)
OS2OS3OH4OP2
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum thickness and material for subfloors supporting wood strip finished flooring that is 19 mm thick or greater and is installed at right angles to joists spaced not more than 600 mm o.c., 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 an inappropriate grade or thickness of subflooring relative to joist spacing, which could lead to inadequate stiffness or strength, which could lead to an inability to resist expected gravity loads, which could lead to the excessive deflection of subfloors, which could lead to an uneven walking surface, which could lead to persons tripping or falling, which could lead to harm to persons.
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