ARCHIVED - 9.23.4.4.(1)

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9.23.4.4.(1)


Objective	OH4 Vibration and Deflection Limitation
Attribution	[F22-OH4] Applies to floors and elements that support floors.
Application	Application 1: Reduction in maximum spans or spacing of lumber joists used to support floors with a concrete topping, in residential applications or where the live load on any floor does not exceed 1.9 kPa, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.]. Exceptions: except as stated in Sentence 9.23.4.4.(2), which applies where the concrete: is 38 to 51 mm thick, is of normal weight, is placed directly on the subflooring, and has not less than 20 MPa compressive strength after 28 days.
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Intent	Intent 1: To limit the probability of excessively long spans, which could lead to inadequate strength to support the additional weight of a concrete topping, which could lead to excessive deflection or failure. For floors and constructions supporting floors, this is to limit the probability of: compromised structural integrity, or for exterior floors or environmental separators supporting a floor, the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to further compromised structural integrity. This is to limit the probability of excessive movement, vibration or deflection of floors, which could lead to negative effects on the psychological well-being of persons.
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