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9.20.8.4.(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: 
In buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], support of beams and columns bearing on:
  • above-ground, unreinforced masonry walls and nominally reinforced masonry where vertical joints in adjacent courses are aligned [see Article 9.20.9.1.]:
    • where the wall height above the foundation wall does not exceed 11 m,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm,
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.55, loadbearing masonry elements of buildings more than 1 storey in building height [see Sentence 9.20.1.2.(1)]:
    • not exceeding 11 m in height above the foundation wall,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm, and
  • in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55, loadbearing masonry elements of buildings 3 storeys in building height [see Sentence 9.20.1.2.(2)]:
    • not exceeding 11 m in height above the foundation wall,
    • in which the roof or floor system above the first storey is not of concrete construction, and
    • where the thickness of the masonry wall or wythe is less than 190 mm.
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 that masonry walls will be unable to resist the concentrated loads imposed by beams or columns, which could lead to cracking of masonry.
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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