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5.8.1.1.(1)
OH1OS2+
ObjectiveOS2 Structural Safety
Attribution
[F60-OS2.3,OS2.2] Applies to portion of Code text: “… the bottom of every exterior foundation wall and every floor-on-ground shall be provided with drainage.”
Application
Application 1: 
Drainage for exterior foundation walls and floors-on-ground.
This applies to building materials, components or assemblies and their interfaces described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Exceptions: 
except where:
  • the foundation wall or floor is subject to continuous hydrostatic pressure, or
  • drainage can be shown to be unnecessary.
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Intent
Intent 1: 
To limit the probability of excessive moisture loading on below-ground assemblies, which could lead to moisture ingress from the ground, which could lead to deterioration, which could lead to compromised structural integrity of the separators or of elements supported or protected by the separators.
Intent 2: 
Where floors are supported on ground, to limit the probability of reducing the soil-bearing capacity due to saturation, which could lead to structural failure, which could lead to harm to persons.
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