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9.20.11.3.(1)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
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: 
Material, minimum diameter and maximum spacing of rods for tying transverse wood-frame walls providing lateral support to above-ground masonry walls, 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:
  • failure of steel-rod ties, or
  • inadequate lateral load distribution, which could lead to failure of the connection between intersecting walls.
This is to limit the probability of an inability to transfer lateral loads from framed walls to intersecting walls, which could lead to inadequate lateral stiffness, which could lead to an inability to resist lateral loads or inadequate distribution of gravity loads, which could lead to cracking or buckling.
Where transverse wood-frame walls support an environmental separator, this is to limit the probability of 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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