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


OH4 Vibration and Deflection Limitation


[F20,F21,F61-OH4]Applies to floors and elements that support floors.


Intent 1:

To limit the probability of:

  • an excessively high cement/aggregate ratio, which could lead to poor workability, excessive compressive strength and attendant high shrinkage, which could lead to tensile stresses and cracking of mortar or masonry units, or
  • an excessively low cement/aggregate ratio, which could lead to weak, porous mortar and inadequate bonding with masonry units.

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.

For floors and elements supporting floors, this is to limit the probability of excessive movement, deflection or vibration, which could lead to negative effects on the psychological well-being of persons.

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