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9.27.3.6.(2)
ApplicationIntent
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
[F20,F61,F55-OS2.3]
Application
Application 1: 
Installation of plywood, hardboard, OSB, waferboard, or fibre cement cladding, in cladding assemblies to which Subsection 9.27.3. applies [see Article 9.27.1.1. for application of Subsection 9.27.3.], where no sheathing membrane is installed.
Exceptions: 
except as stated in:
  • Sentence 9.27.2.2.(4), which applies to exterior walls that enclose spaces of residential occupancy or spaces that directly serve spaces of residential occupancy,
  • Clause 9.27.2.2.(5)(a), which applies to cladding assemblies where the number of degree-days is less than 3400 and the moisture index is greater than 0.90, or
  • Clause 9.27.2.2.(5)(b), which applies to cladding assemblies where the number of degree-days is 3400 or more, and the moisture index is greater than 1.00.
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Intent
Intent 1: 
To limit the probability of:
  • precipitation ingress, or
  • excessive air infiltration or “wind-washing,” which could lead to condensation or excessive heat transfer.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of exterior walls, which could lead to harm to persons.
Intent 2: 
To clarify the application of Sentence 9.27.3.6.(1).
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