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9.20.2.3.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OP1
ObjectiveOH1 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.
Application
Application 1: 
Glass blocks used in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of an inability to resist gravity, lateral or impact loads and high temperatures.
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,
  • excessive heat transfer,
  • 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 in 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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