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9.26.3.1.(5)
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Maintaining the positive slope of roofs or constructions that effectively serve as roofs, with respect to exterior walls and guards that are connected by more than pickets or posts to roofs or constructions that effectively serve as roofs, of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except where back-slope will not adversely affect adjacent supported or supporting constructions due to water ingress.
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Intent
Intent 1: 
To limit the probability of insufficient positive slope of the roof or construction that serves as a roof after shrinkage and loading of the building, 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.
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