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9.26.11.10.(3)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F61-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Flashing for built-up roofs, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where a cant strip has been installed at the edge of the roof.
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate protection for roofing membranes carried over the perimeter cant strip, which could lead to mechanical damage or exposure to ultraviolet radiation from the sun, which could lead to membrane failure, or
  • water overflowing the flashing and returning under the edge of the roofing membrane by capillary action or wind pressure.
This is to limit the probability of:
  • water accumulating and penetrating exterior walls, 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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