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9.18.2.1.(2)
ApplicationIntent
OH1OS2OH2
ObjectiveOH1 Indoor Conditions
Attribution
[F51,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, where:
  • crawl spaces are unheated and access is from the exterior,
  • crawl spaces are unheated and access is from the interior, or
  • crawl spaces are heated and access is from the exterior.
This applies to 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,
    • an infestation of insects or vermin, or
    • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces, relative humidity or drafts,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of environmental separators or of elements protected by the separators.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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