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9.26.4.3.(2)
ApplicationIntent
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F20,F22-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Sheathing to support valley flashing for roofs of 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 limit the probability that roof sheathing will not be installed under valley flashing, which could lead to insufficient support of the flashing, which could lead to excessive deflection or failure of the roofing.
This is to limit the probability of precipitation or meltwater ingress, which could lead to:
  • compromised thermal performance of components intended to resist heat transfer, which could lead to an inadequate control of the temperature of interior spaces,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of environmental separators, 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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