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9.26.4.1.(1)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Installation of flashing at junctions between roofs and:
  • walls that rise above roofs, and
  • guards that are connected to the roof by more than pickets or posts.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except where the omission of flashing will not adversely affect adjacent supported or supporting constructions.
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Intent
Intent 1: 
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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