1. OH1
  2. OS2
  3. OP2
  4. OS1
  5. OH4
  6. OS3


OS1 Fire Safety


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


Intent 1:

To limit the probability of:

  • concentrations of stress in areas that typically experience higher levels of lateral stress (e.g. around openings), which could lead to an inability to resist transverse or vertical loads, and
  • inadequate load distribution among the wythes of multiple-wythe masonry walls.

This is to limit the probability of cracking or buckling.

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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