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9.27.3.8.(3)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Installation of flashing over exterior wall openings through cladding assemblies to which Subsection 9.27.3. applies [see Article 9.27.1.1. for application of Subsection 9.27.3.], where the vertical distance from the bottom of the eave to the top of the trim is more than one-quarter of the horizontal overhang of the eave.
Exceptions: 
except as stated in Sentence 9.27.3.8.(6), which applies to openings for windows and doors provided with an integral exterior flange and designed to be installed on the exterior of essentially flat lock-seam metal siding without a head or sill flashing.
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Intent
Intent 1: 
To limit the probability of:
  • precipitation or meltwater ingress at the heads of openings through cladding, and
  • an inadequate dissipation of precipitation or meltwater to the exterior, which could lead to the excessive accumulation of moisture.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of exterior walls or elements protected by exterior walls, which could lead to harm to persons.
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