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9.20.9.3.(2)
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: 
Maximum spacing of masonry units that bond the wythes of above-ground masonry walls that consist of 2 or more wythes, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except:
  • for masonry veneer walls [see Sentence 9.20.9.2.(1)], and
  • 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 inadequate load distribution among the wythes of masonry-bonded, multiple-wythe walls, which could lead to an inability to resist transverse or vertical loads, which could lead to cracking or buckling.
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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