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9.15.2.2.(1)
ApplicationIntent
OS2OS3OH4OH1OP2
ObjectiveOH4 Vibration and Deflection Limitation
Attribution
[F20,F21,F61-OH4] Applies to floors and elements that support floors.
Application
Application 1: 
Concrete block used in foundations for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where the foundations are:
  • not subject to surcharge, and
  • erected on stable soils with:
    • for standard foundation construction and for buildings of wood-frame construction [see Article 9.23.1.1.] or masonry construction, an allowable bearing pressure of 75 kPa or greater, and
    • for flat insulating concrete form foundation walls and for buildings of light-frame construction [see Article 9.4.2.1.] or flat insulating concrete form construction that are not more than 2 storeys in building height, with a maximum floor-to-floor height of 3 m, and contain only a single dwelling unit, an allowable bearing pressure of 100 kPa or greater.
Exceptions: 
except as stated in Sentence 9.15.1.2.(1), which applies to foundations and footings for buildings erected on permafrost.
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Intent
Intent 1: 
To limit the probability that concrete block of inadequate compressive strength will be used, which could lead to:
  • an inadequate resistance to water absorption, which could lead to excessive water absorption, which could lead to blocks cracking due to freeze-thaw stresses, or
  • an inability to support loads, which could lead to blocks cracking.
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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