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9.26.4.4.(1)
ApplicationIntent
OH1OS2OS1OP1OS3
ObjectiveOS3 Safety in Use
Attribution
[F61-OS3.4] Applies where a shingle roof intersects with a masonry chimney.
Application
Application 1: 
Flashing at intersections 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 the intersection is between a shingle roof and a chimney, to limit the probability of precipitation or meltwater ingress into chimneys, which could lead to damage to masonry or to chimney liners from freeze-thaw stresses, which could lead to the premature failure of chimney liners, which could lead to carbon monoxide gas leaking into living space, which could lead to the acute poisoning or asphyxiation of persons.
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