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9.26.4.4.(2)
ApplicationIntent
OH1OS2OS1OP1OS3
ObjectiveOS1 Fire Safety
Attribution
[F61-OS1.1] Applies where counter flashing is installed between a shingle roof and a masonry chimney.
Application
Application 1: 
Installation of required counter flashing at the intersection of shingle roofs and chimneys, on 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: 
Where counter flashing is installed between a shingle roof and a chimney, to limit the probability of:
  • water running down the face of masonry and entering behind primary flashing, or
  • the intersection being unable to accommodate differential vertical movement of chimneys and roof surfaces, which could lead to the displacement of or damage to flashing.
This is to limit the probability of precipitation or meltwater ingress into chimneys, which could lead to damage to chimney liners from freeze-thaw stresses, which could lead to the escape of heat or flames, which could lead to the ignition of combustible building components, which could lead to harm to persons [see analysis for Sentence 9.21.4.6.(1)].
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