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9.26.7.5.(1)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Securing the tabs of asphalt shingles on roofs having a slope of 1 in 3 or greater, on 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).
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Intent
Intent 1: 
To limit the probability of:
  • an inadequate resistance to wind-uplift loads, which could lead to lifting and breakage of shingle tabs, or
  • excessively large spots of cement, which could lead to blistering of shingles due to a reaction with solvents, which could lead to compromised water resistance.
This is to limit the probability of water penetrating directly to roof decking or sheathing.
This is to limit the probability of 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, which could lead to harm to persons.
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