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9.26.4.8.(5)
ApplicationIntent
OH1OS2OS1OP1OS3
ObjectiveOP1 Fire Protection of the Building
Attribution
[F61-OP1.1]
Application
Application 1: 
Sheet metal flashing at the intersections of roofs sloping upwards from masonry chimneys that are not provided with a saddle, 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: 
To exempt situations from the application of Sentence 9.26.4.8.(1) where sufficient protection is provided by flashing and counter flashing.
Intent 2: 
To limit the probability that the flow of water down a roof's surface will be interrupted by a wide chimney, which could lead to a temporary increase in water depth beyond the depth protected by roofing or by the vertical leg of flashing at the chimney, 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 escape of heat or flames, which could lead to the ignition of combustible building components, which could lead to damage to the building [see analysis for Sentence 9.21.4.6.(1)].
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