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


OS3 Safety in Use


[F20,F80-OS3.1]Applies to floors and elements that support floors.
[F20,F80-OS3.4]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:

  • compromised structural integrity of masonry construction,
  • where masonry construction is part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to deterioration, or
  • in assemblies exposed to moisture or the exterior, damage and deterioration.

This is to limit the probability of:

  • for floors and elements supporting floors, excessive deflection, which could lead to persons losing their balance, tripping or falling, or
  • where masonry is used in chimneys and fireplaces, the cracking of masonry units, which could lead to the leakage of combustion products, which could lead to asphyxiation or acute poisoning.

This is to limit the probability of harm to persons.

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