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


OS1 Fire Safety


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


Intent 1:

To limit the probability of:

  • inadequate width of masonry units in loadbearing contact with each other, which could lead to an inability to resist expected gravity or lateral loads,
  • insufficient bond strength to resist tensile stresses in non-loadbearing masonry cavity walls, or
  • inadequate bonding of ties with mortar, which could lead to inadequate pullout and pushout resistance.

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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