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9.20.6.4.(1)
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
[F20,F22-OS2.3] 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.
This is to limit the probability of:
  • structural failure of masonry veneer, or
  • where masonry veneer 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.
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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