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9.30.2.2.(1)
OS3OS2OH1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum thickness and properties of panel-type underlay in floors, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 9.30.2.2.(2), which applies to the minimum thickness of panel-type underlay under ceramic tile applied with adhesive.
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Intent
Intent 1: 
To limit the probability:
  • of inadequate rigidity of underlay panels, or
  • that the performance of underlay will fall significantly below expectations.
This is to limit the probability that the underlay will be unable to bridge any irregularities in the subfloor and will telegraph them to the finished flooring, which could lead to the displacement or cracking of finished flooring.
This is to limit the probability of:
  • rough or uneven finished floor surfaces, which could lead to persons tripping or falling, or
  • where finished flooring is required to provide water resistance, the ingress of water into the subfloor, which could lead to compromised physical integrity of the supporting structure, which could lead to uneven finished floor surfaces, which could lead to persons tripping or falling.
This is to limit the probability of harm to persons.
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