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9.26.7.4.(2)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
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.
This is to limit the probability of:
  • roofing detaching and falling, or
  • precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of roofs or walls or of assemblies protected by roofs or walls.
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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