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9.30.2.1.(3)
ApplicationIntent
OS3OH1OS2
ObjectiveOS3 Safety in Use
Attribution
[F81-OS3.1]
Application
Application 1: 
Underlay for ceramic tile flooring applied with adhesive, 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 bridging of subfloor joints, which could lead to differential movement between adjoining subfloor panels, which could lead to the displacement or 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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