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9.20.9.4.(4)
ApplicationIntent
OH1OS2OP2OS1OH4OS3
ObjectiveOS1 Fire Safety
Attribution
[F20,F80-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Individual rod-type metal ties that tie together the wythes of above-ground masonry walls that consist of 2 or more wythes, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except:
  • for masonry veneer walls [see Sentence 9.20.9.2.(1)], 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:
  • concentrations of stress from horizontal loads acting on ties that are vertically aligned, which could lead to cracking, or
  • inadequate embedment of ties in mortar.
This is to limit the probability of:
  • buckling or tensile failure of the ties,
  • an inadequate resistance to tensile or compressive loads,
  • water ingress from rain or melting snow along ties, which could lead to the corrosion or rotting of structural building elements, or
  • the exposure of ties to water, which could lead to the corrosion of ties.
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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