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9.26.2.3.(2)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Dimensions for staples used to apply asphalt shingles, on 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 as stated inSentence 9.26.7.4.(2), which applies where shingles are fastened with at least 6 staples having a crown of at least 11 mm.
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate resistance to withdrawal from the substrate, and
  • an inadequate contact area between the staple's crown and the shingle's surface, which could lead to excessive stressing of the staple/shingle interface, which could lead to pull-through failure.
This is to limit the probability of the displacement of shingles, which could lead to:
  • 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 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 assemblies protected by roofs.
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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