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9.30.2.2.(2)
OS2OS3OH1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum thickness of panel-type underlay under ceramic tile applied with adhesive in floors, 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 inadequate rigidity of underlay panels, which could lead to the deformation or displacement of underlay at joints, which could lead to the cracking of ceramic tile.
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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