9.27.3.8.(2)

Objective

OH1 Indoor Conditions

Attribution

(b)(i), (c)(ii)[F61,F62-OH1.1,OH1.2,OH1.3]Applies to cladding installed outboard of a drained and vented air space.

Intent

Intent 1:

To limit the probability of an inadequate dissipation of precipitation or meltwater to the exterior, which could lead to the excessive accumulation of moisture.

This is to limit the probability of:

  • 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, and
  • contact with moisture.

This is to limit the probability of harm to persons.

Intent 2:

To limit the application of Sentence 9.27.3.8.(1), where the wall assembly is constructed such that:

  • precipitation or meltwater ingress at horizontal joints will be minimized, or
  • moisture that bypasses the cladding will be dissipated.

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