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9.15.5.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F40,F61-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Foundation walls of hollow masonry units supporting floor joists on soils having an allowable bearing pressure of 75 kPa or greater, for buildings of wood-frame or masonry construction to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in:
  • Sentence 9.15.5.1.(2), which applies to the capping of foundation walls
    • in localities where termites are not known to occur,
    • where the joists are supported on a wood plate not less than 38 mm by 89 mm, and
    • where the top of the foundation wall is protected from water ingress by siding overlapping the foundation wall not less than 12 mm, and
  • Sentence 9.15.1.2.(1), which applies to buildings that are erected on permafrost.
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate distribution of roof or floor loads transmitted through framing elements, which could lead to overstressing of hollow masonry units,
  • an inadequate barrier, which could lead to termites accessing structural wood elements, or
  • the ingress of water into the cores of hollow masonry units.
This is to limit the probability of:
  • compromised structural integrity, or
  • where elements support or are part of an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements.
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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