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9.26.10.2.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F61-OS2.3]
Application
Application 1: 
Underlay for wood-shake roofs, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where eave protection is not provided [see Sentences 9.26.5.1.(1) and (2)]:
  • over unheated garages, carports and porches,
  • where the roof overhang exceeds 900 mm measured along the roof slope from the edge of the roof to the inner face of the exterior wall,
  • on roofs with slopes of 1 in 1.5 or greater, or
  • in regions with 3 500 or fewer degree-days.
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Intent
Intent 1: 
To limit the probability of the ingress of water that has accumulated behind ice dams or from wind-driven rain or snow at gaps between shakes in the vicinity of eaves, which could lead to water penetrating directly to roof decking or sheathing, which could lead to deterioration, which could lead to the structural failure of roofs or assemblies protected by roofs, which could lead to harm to persons.
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