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9.20.13.9.(1)
OH1OS2OP2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Protection of the interior finish of exterior masonry walls where it is of a type that may be damaged by moisture, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • not exceeding 11 m in height above the foundation wall, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except:
  • for cavity walls,
  • for walls that are protected for their full height by the roof of a carport or porch,
  • as stated in Sentence 9.20.13.9.(3), which applies to walls where the finish is protected by insulation that effectively limits the passage of water and is applied by a waterproof adhesive or mortar directly to parged masonry, 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 moisture protection of interior finishes, which could lead to rainwater penetrating the interior surface of solid masonry walls and contacting vulnerable interior finishes.
This is to limit the probability of:
  • water ingress and accumulation, 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 or relative humidity,
  • 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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