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9.18.5.1.(1)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Grading or drainage of crawl spaces whose exterior walls have less than 25% of their total area above exterior ground level open to the outdoors, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except where grading or drainage can be shown to be unnecessary.
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Intent
Intent 1: 
To limit the probability of:
  • the ingress of rainwater, or
  • the ingress of surface water.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of building components, which could lead to harm to persons.
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