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9.26.7.4.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20,F61-OS2.3]
Application
Application 1: 
Fastening of 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].
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.(2), which applies where staples with an 11-mm crown are used, and
  • 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 number of fasteners, which could lead to an inability to resist uplift forces from wind, vibration and gravity, or
  • exposed fasteners, which could lead to the shrinkage and tearing of shingles over time.
This is to limit the probability of 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.
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