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9.20.9.1.(1)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F20-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Vertical joints in adjacent courses in:
  • above-ground, nominally unreinforced masonry, and
  • above-ground masonry reinforced with the equivalent of not less than 2 corrosion-resistant steel bars of 3.76 mm diam placed in the horizontal joints at vertical intervals not exceeding 460 mm.
This applies to masonry construction to which Section 9.20. applies [see Sentence 9.20.1.1.(1) for application of Section 9.20.], in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of an inadequate resistance to in-plane and transverse shear stresses, which could lead to cracking or structural failure of vertical mortar joints.
Where masonry units support or are part of an environmental separator, this is to limit the probability of:
  • excessive moisture transfer through masonry units, or
  • deformation or cracking, which could lead to the displacement or failure of required environmental separation elements.
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, or
  • deterioration, which could lead to further compromised integrity of environmental separators.
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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