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9.26.7.4.(2)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F20-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Minimum number of staples for fastening 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], where staples with an 11-mm crown are used.
Application 2: 
This also applies to asphalt shingles installed as cladding, as stated in Sentence 9.27.1.1.(4).
Application 3: 
This also applies to the fastening of asphalt shingles on roofs with slopes of less than 1 in 3, as stated in Sentence 9.26.8.7.(1).
Exceptions: 
except as stated in Sentence 9.26.7.4.(3), which applies to shingles that are less than 1 m wide.
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate bearing area between the staple's crown and the shingle's surface, which could lead to excessive stress on the staple/shingle interface, which could lead to pull-through, or
  • an inadequate resistance to withdrawal from the substrate.
This is to limit the probability of the displacement 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 supersede the requirement for 4 fasteners stated in Sentences 9.26.2.3.(2) and 9.26.7.4.(1), and increase the number of fasteners to 6 for constructions where relatively narrow staples are used.
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