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9.20.5.2.(2)
ApplicationIntent
OH1OS2OP2OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F22-OS1.2] Applies to assemblies required to provide fire resistance.
Application
Application 1: 
Steel angle lintels supporting masonry veneer over openings, 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 does not exceed 11 m in height above the foundation wall, and
  • in which the roof or floor system above the first storey is not of concrete construction.
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Intent
Intent 1: 
To limit the probability of:
  • lintels that are inadequate in size or have an excessive span, which could lead to the excessive deflection or failure of lintels, which could lead to the cracking or structural failure of masonry veneer over openings, or
  • an inadequate bearing area between lintels and supported masonry veneer, which could lead to shear or compression failure of masonry veneer.
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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