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9.18.2.1.(1)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F82-OH1.1,OH1.2]
Application
Application 1: 
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].
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Intent
Intent 1: 
To limit the probability of an inability to inspect conditions or services in crawl spaces, which could lead to:
  • malfunctioning or inoperable building services, or
  • the ingress of water from the ground going undetected.
This is to limit the probability of:
  • an inadequate control of the temperature of interior spaces, relative humidity or the accumulation of moisture,
  • inadequate ventilation,
  • the production of hazardous by-products of combustion,
  • 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, and
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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