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9.26.4.4.(4)
ApplicationIntent
OH1OS2OS1OP1OS3
ObjectiveOS3 Safety in Use
Attribution
[F61-OS3.4] Applies where a shingle roof slopes upward from a masonry chimney.
Application
Application 1: 
Minimum extension up the roof slope of flashing at intersections of shingle roofs sloping upwards from masonry walls or chimneys whose upper side is not more than 750 mm wide, 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 shingle roof slopes upwards from a masonry chimney, to limit the probability of an insufficient upwards extension of flashing, which could lead to precipitation or meltwater ingress, 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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