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9.27.2.4.(1)
ApplicationIntent
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F61,F80-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Minimum clearance between finished ground and cladding that is adversely affected by moisture, for cladding assemblies to which Subsection 9.27.2. applies [see Article 9.27.1.1. for application of Subsection 9.27.2.].
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Intent
Intent 1: 
To limit the probability that precipitation or meltwater will splash, soak or pool against the lower portions of cladding, which could lead to the accelerated deterioration and premature failure of cladding.
This is to limit the probability of precipitation or meltwater ingress, which could lead to:
  • compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to an inadequate control of the temperature of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, or
  • contact with moisture.
This is to limit the probability of harm to persons.
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