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9.26.9.3.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F61-OS2.3]
Application
Application 1: 
Dimensions of wood 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].
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Intent
Intent 1: 
To limit the probability of:
  • if shingles were too short, insufficient overlap of wood shingles at the desired exposure, which could lead to an insufficient number of shingle plies over the roof surface, which could lead to coinciding defects,
  • if shingles were too narrow, splitting, exposed joints or defects in underlying courses at joints between shingles or shakes, or
  • if shingles were too wide, shrinkage and cracking.
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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