9.20.3.2.(5)

Objective

OH1 Indoor Conditions

Attribution

[F20-OH1.1,OH1.2,OH1.3]Applies to elements that support or are part of an environmental separator and to masonry used in chimneys and fireplaces.

Intent

Intent 1:

To limit the probability of inadequate compressive or bond strength, which could lead to cracking at mortar joints or inadequate bonding to masonry units.

This is to limit the probability of:

  • excessive moisture transfer through masonry units, or
  • deformation or cracking, which could lead to:
    • where masonry units support or are part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, or
    • where masonry is used in chimneys and fireplaces, compromised integrity of chimneys or fireplaces.

This is to limit the probability of:

  • condensation,
  • precipitation ingress,
  • moisture ingress,
  • pollutant ingress, or
  • compromised thermal performance of components intended to resist heat transfer.

This is to limit the probability of:

  • an inadequate control of temperatures of interior spaces, drafts, relative humidity or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to further compromised integrity of environmental separators, or
  • where masonry is used in chimneys and fireplaces, the leakage of combustion products.

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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