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9.14.2.1.(1)
ApplicationIntent
OH1OS2OP2
ObjectiveOH1 Indoor Conditions
Attribution
[F60-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Drainage of the bottom of exterior foundation walls of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for:
  • the foundation walls of crawl spaces whose exterior walls have 25% or more of their total area above exterior ground level open to the outdoors [see Sentence 9.18.1.1.(1)],
  • foundation walls that are subject to continuous hydrostatic pressure, and
  • foundation walls that are effectively drained by the native soil, or that have otherwise demonstrated that they do not require drainage.
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Intent
Intent 1: 
To limit the probability of excessive moisture loading, including hydrostatic pressure, on foundation walls and basement floors.
This is to limit the probability of:
  • the ingress of moisture from the ground, 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 water ingress and accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of elements protected by the environmental 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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