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9.20.6.4.(1)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3] Applies to elements that are part of an environmental separator.
Application
Application 1: 
Minimum thickness of units of masonry veneer not individually supported by the structural backing, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the walls are not in contact with the ground,
  • the wall height above the foundation wall does not exceed 11 m, and
  • the roof or floor assembly above the first storey is not of concrete construction.
Exceptions: 
except as stated in:
  • Sentence 9.20.1.1.(2), which applies to masonry walls other than those described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states, and
  • Sentence 9.20.6.4.(4), which applies to masonry veneer required to be individually supported by the backing material.
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Intent
Intent 1: 
To limit the probability of:
  • the veneer being unable to support its own weight or lateral loads,
  • insufficient bonding area between ties and mortar in loadbearing or non-loadbearing masonry cavity walls, which could lead to an inability to resist lateral, tensile and compressive loads, or
  • insufficient bond strength between masonry veneer units in loadbearing or non-loadbearing cavity walls, which could lead to an inability to resist tensile stresses due to lateral loads.
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,
  • 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 of 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.
Intent 2: 
To exempt masonry veneer in which the units are not designed to provide vertical support to each other from the minimum thickness requirement of this Sentence.
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