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9.26.11.10.(3)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Flashing for built-up roofs, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where a cant strip has been installed at the edge of the roof.
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate protection for roofing membranes carried over the perimeter cant strip, which could lead to mechanical damage or exposure to ultraviolet radiation from the sun, which could lead to membrane failure, or
  • water overflowing the flashing and returning under the edge of the roofing membrane by capillary action or wind pressure.
This is to limit the probability of water accumulating and penetrating exterior walls, which could lead to deterioration, which could lead to the structural failure of roofs or assemblies protected by roofs, which could lead to harm to persons.
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