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9.26.4.3.(4)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Flashing for open valleys on roofs of 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:
  • insufficient width, which could lead to water flowing down valleys, spreading horizontally beyond the edges of the flashing and penetrating the roof assembly, or
  • inadequate flexibility, strength or durability, which could lead to damage under snow and impact loads or exposure to the elements.
This is to limit the probability of precipitation or meltwater ingress, 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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