1. OS2
  2. OP2
  3. OH1
  4. OS1
  5. OH4
  6. OS3
  7. OP1


OS1 Fire Safety


[F20,F80-OS1.2]Applies to assemblies required to provide fire resistance.
[F01-OS1.1,OS1.2]Applies to masonry used in chimneys and fireplaces.


Intent 1:

To limit the probability that concrete blocks will be unable to resist expected structural or environmental loads.

This is to limit the probability of:

  • where masonry construction is required to provide fire resistance, excessive deformation or cracking, which could lead to compromised fire resistance of the assembly, or
  • for chimneys and fireplaces, excessive heat transfer, which could lead to the ignition of combustible building components.

This is to limit the probability of harm to persons.

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