9.27.5.6.(1)

Objective

OH1 Indoor Conditions

Attribution

Intent

Intent 1:

To limit the probability that cladding, which is made of a material with a high coefficient of thermal expansion, will be restrained from expanding and contracting within the expected range of service temperatures, which could lead to:

  • buckling of cladding,
  • tearing of cladding at fastener locations, or
  • deformation, loosening or pullout of fasteners.

This is to limit the probability of the displacement of cladding, trim and flashing, opening of joints or failure of caulking, which could lead to:

  • precipitation or meltwater ingress, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.

This is to limit the probability of:

  • an inadequate control of temperatures of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls, or
  • water accumulation in interior spaces.

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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