9.20.6.2.(2)

Objective

OH4 Vibration and Deflection Limitation

Attribution

[F20,F22-OH4]Applies to floors and elements that support floors.

Intent

Intent 1:

To limit the probability of:

  • excessive spacing between wythes, which could lead to:
    • compromised ability of wythes to act as a single, structural element, or
    • buckling of wall ties under compressive loads due to lateral loads from wind or earthquakes, or
  • an inadequate width of cavities, which could lead to extruded mortar bridging the cavity, which could lead to water crossing the cavity and penetrating the interior wythes by capillary action, which could lead to the deterioration of the interior wythes.

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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