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9.26.7.2.(3)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Asphalt-shingle roofs, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where eave protection of not less than Type M mineral-surfaced roll roofing is provided.
Application 2: 
This also applies to starter strips for asphalt shingles on roofs having a slope of less than 1 in 3, as stated in Sentence 9.26.8.2.(1).
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Intent
Intent 1: 
To limit the probability of inadequate protection against water leakage through cutouts between shingle tabs in the bottom course of shingles, which could lead to:
  • water penetrating directly to roof decking or sheathing, 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 walls or of assemblies protected by roofs or walls.
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 exempt constructions from the application of Sentence 9.26.7.2.(1), where the functions of starter strip and eave protection are combined.
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