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9.27.7.4.(1)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F61-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Minimum joint offset for shingles and shakes, 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 limit the probability of water, from rain or melted snow running down the face of cladding, entering joints between shingles or shakes, and penetrating the cladding assembly through corresponding joints between shingles or shakes in lower courses.
This is to limit the probability of:
  • 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 temperatures 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 exterior walls or elements protected by exterior walls, 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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