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9.26.3.1.(3)
ApplicationIntent
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F61,F80-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Slopes for profiled metal roof cladding systems specifically designed for low-slope applications for roofs that have lower slopes than the minimum slopes required by Table 9.26.3.1., 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: 
For minimum slope requirements, to limit the probability of an insufficient slope of the roof or construction that serves as a roof, which could lead to inadequate drainage or water pooling, which could lead to:
  • water accumulation, which could lead to damage to roofing material, which could lead to the deterioration of roofing, or
  • water ingress at roofing joints.
This is to limit the probability of the premature failure of roofing, which could lead to precipitation or meltwater ingress.
This is to limit the probability of:
  • compromised thermal performance of components intended to provide resistance to heat transfer, which could lead to an inadequate control of the temperature of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of roofs or assemblies protected by roofs, or
  • water accumulation in interior spaces.
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.
Intent 2: 
To supersede the application of Sentence 9.26.3.1.(1) to allow lower slopes where roofing material specifically designed for lower slopes will be used.
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