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9.23.2.3.(1)
OS2OP2OH1OS1OH4OS3
ObjectiveOS3 Safety in Use
Attribution
[F80-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Moisture protection for untreated wood joists, beams, sill plates, columns and other members supported on concrete or masonry in contact with the ground, 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 Sentence 9.23.2.3.(2), which applies where the wood is at least 150 mm above the ground.
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Intent
Intent 1: 
To limit the probability of inadequate resistance to or protection from surface water or water from the ground transferred by capillary action through masonry or concrete, which could lead to wood decay, which could lead to an inability to resist expected gravity or lateral loads.
For floors and elements supporting floors, this is to limit the probability of:
  • compromised structural integrity, or
  • where members support or are part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration.
This to limit the probability of excessive deflection or vibration of floors, which could lead to persons losing their balance, tripping or falling, which could lead to harm to persons.
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