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9.20.14.1.(1)
OS2OP2OH1OS1OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F80-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Minimum temperature, during and following installation, of mortar and masonry, including mortar and masonry in foundations, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
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Intent
Intent 1: 
To limit the probability of inadequate curing conditions, which could lead to a weak mortar-to-masonry bond or an inadequate resistance to freeze-thaw stresses.
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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