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9.26.10.1.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F61-OS2.3]
Application
Application 1: 
Dimensions of wood shakes, on roofs of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • insufficient length, which could lead to an insufficient overlap of wood shakes at the maximum exposure permitted, which could lead to an insufficient number of shake plies over the roof surface, which could lead to coinciding defects,
  • insufficient width or shrinkage and cracking of excessively wide wood shakes, which could lead to an excessive number and proximity of cracks or joints, which could lead to relatively short paths for water penetration past shingles, or
  • significant differences in the thickness of shakes, which could lead to the ingress of wind-driven rain or snow through gaps.
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 assemblies protected by roofs, which could lead to harm to persons.
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