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9.13.3.1.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F61-OS2.3]
Application
Application 1: 
Waterproofing of exterior surfaces of:
  • floors-on-ground that are subject to hydrostatic pressure, and
  • walls below ground level that are subject to hydrostatic pressure, where the finished ground level outside is higher than the ground level inside.
This applies to 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 an inadequate resistance to water from the ground, under hydrostatic pressure, which could lead to the ingress of moisture from the ground, which could lead to deterioration, which could lead to compromised structural integrity of floors or of elements protected or supported by floors-on-ground or foundation walls, which could lead to harm to persons.
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