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9.27.2.4.(2)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Minimum clearance between roof surfaces and cladding that rises above roof surfaces and is adversely affected by moisture, for cladding assemblies to which Subsection 9.27.2. applies [see Article 9.27.1.1. for application of Subsection 9.27.2.].
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Intent
Intent 1: 
To limit the probability that precipitation or meltwater will splash, soak or pool against the lower portions of cladding, which could lead to the accelerated deterioration and premature failure of cladding.
This is to limit the probability of:
  • precipitation or meltwater ingress, which could lead to deterioration, which could lead to compromised structural integrity of exterior walls or elements protected by exterior walls, which could lead to structural failure,
  • falling cladding components, or
  • where panel-type siding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i), an inability of the cladding to resist lateral loads, which could lead to racking of exterior walls, which could lead to
    • the deformation of the building, or
    • the displacement of cladding, trim and flashing, the opening of joints or the failure of caulking, which could lead to precipitation or meltwater ingress, which could lead to further deterioration, which could lead to further compromised structural integrity.
This is to limit the probability of harm to persons.
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