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9.20.4.3.(3)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1]
[F20-OS2.3] Applies to elements that support or are part of an environmental separator.
Application
Application 1: 
Mortar joints of solid masonry units, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], used in:
  • unreinforced masonry and masonry veneer walls, 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,
  • foundation walls [see Sentence 9.15.2.2.(2)], and
  • interior masonry foundation walls not subject to lateral earth pressure [see Sentence 9.15.4.10.(1)].
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 discontinuity in the mortar joints of solid masonry units, which could lead to mortar joints of inadequate tensile and compressive strength.
This is to limit the probability of compromised structural integrity, which could lead to:
  • the structural failure of masonry construction,
  • where masonry construction is part of an environmental separator, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity, or
  • in assemblies exposed to moisture or the exterior, damage and deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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