9.27.3.8.(2)

Objective

OH1 Indoor Conditions

Attribution

(a),(b)(ii),(c)(i)[F61-OH1.1,OH1.2,OH1.3]Applies to detailing of horizontal joints.

Intent

Intent 1:

To limit the probability of precipitation or meltwater ingress at horizontal joints between cladding elements.

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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