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9.20.6.4.(3)
ApplicationIntent
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3,OS2.5] [F22-OS2.3,OS2.5]
Application
Application 1: 
Minimum thickness of units of masonry veneer with raked mortar joints, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • the masonry veneer is not individually supported by the structural backing,
  • the masonry veneer is 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 insufficient contact area between mortar and masonry veneer, which could lead to:
  • the wall being unable to support its own weight or lateral loads,
  • insufficient bonding area between ties and mortar, or
  • insufficient bond strength between masonry units.
This is to limit the probability of:
  • the structural failure of masonry veneer, or
  • where masonry is exposed to precipitation, the cracking of masonry or mortar, which could lead to excessive water ingress, which could lead to the deterioration of building elements, which could lead to compromised structural integrity.
This is to limit the probability of harm to persons.
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