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9.20.9.5.(1)
OH1OS2OP2OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22,F80-OH1.1,OH1.2,OH1.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Corrosion resistance, minimum thickness, minimum width, shape and spacing of straps for masonry veneer 75 mm or more in thickness and resting on a bearing support, 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 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:
  • excessive corrosion of straps,
  • inadequate strength of straps, or
  • failure of the bond between mortar and straps under lateral loads.
This is to limit the probability of buckling or tensile failure of the straps under lateral loads, which could lead to the excessive flexing of masonry veneer, 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 mortar joints or cracked masonry.
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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