ARCHIVED - 9.26.4.8.(5)

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9.26.4.8.(5)


Objective	OH1 Indoor Conditions
Attribution	[F61-OH1.1,OH1.2,OH1.3]
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, or compromised thermal performance of components intended to provide resistance to heat transfer. This is to limit the probability of: an inadequate control of relative humidity, temperatures of interior spaces or water accumulation, the generation of pollutants from biological growth or from materials that become unstable on wetting, or deterioration, which could lead to compromised integrity of roofs or assemblies protected by roofs. This is to limit the probability of: negative effects on the air quality of indoor spaces, the inadequate thermal comfort of persons, and contact with moisture. This is to limit the probability of harm to persons.
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