9.20.3.1.(1)

Objective

OH1 Indoor Conditions

Attribution

[F20,F80-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 that the performance of cement and aggregate under expected structural and environmental loads will fall significantly below expectations, which could lead to cracking at mortar joints and 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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