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9.18.2.1.(2)
ApplicationIntent
OH1OS2OH2
ObjectiveOS2 Structural Safety
Attribution
[F63-OS2.3] Applies where crawl spaces are unheated and access is from the interior.
[F42,F61-OS2.3] Applies where crawl spaces are heated or unheated and access is from the exterior.
Application
Application 1: 
Closures for access openings for 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 for heated crawl spaces that are accessible from the interior.
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Intent
Intent 1: 
To limit the probability of unprotected access openings, which could lead to:
  • where crawl spaces are unheated and access is from the interior, moisture transfer from the interior, or
  • where crawl spaces are heated or unheated and access is from the exterior:
    • the ingress of precipitation, or
    • an infestation of insects or vermin.
This is to limit the probability of compromised structural integrity, which could lead to:
  • structural failure, or
  • for environmental separators or elements supporting an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
This is to limit the probability of harm to persons.
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