9.20.6.4.(1)

Objective

OS1 Fire Safety

Attribution

[F20,F22-OS1.2]Applies to assemblies required to provide fire resistance.

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.

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.

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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