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9.3.2.5.(1)
ApplicationIntent
OS2OP2OS3OH1OS1OH4
ObjectiveOS3 Safety in Use
Attribution
[F21,F80-OS3.1] Applies to floors and elements that support floors.
Application
Application 1: 
Maximum moisture content of lumber at the time of its installation in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of the entrapment of moisture inside closed building envelopes, which could lead to:
  • excessive post-installation shrinkage and warping,
  • wood decay, which could lead to a loss of lumber strength, or
  • the exposure of other materials that are moisture-sensitive and susceptible to decay to high moisture levels and decay fungi.
This is to limit the probability of:
  • compromised structural integrity, or
  • where lumber supports or is used in an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, which could lead to compromised structural integrity.
Where lumber supports or is used in floors, this is to limit the probability of excessive deflection or vibration of floors, which could lead to a loss of balance, tripping or falling, which could lead to harm to persons.
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