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9.20.4.3.(3)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20-OS1.2] Applies to assemblies required to provide fire resistance.
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.
Where masonry construction is required to provide fire resistance, this is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
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