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9.23.15.4.(1)
OS2OP2OH1OS1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Staggered joints of wood-based panels used for roof sheathing, in wood-frame constructions to which Section 9.23. applies [see Sentence 9.23.1.1.(1) for application of Section 9.23.], where:
  • the sheathing is applied with the surface grain parallel to the roof ridge, and
  • the edges of the panels are required to be supported as specified in Article 9.23.15.7.
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Intent
Intent 1: 
To limit the probability of aligned joints, which could lead to inadequate strength, which could lead to an inability to resist expected gravity and lateral loads, which could lead to the excessive deflection of sheathing between roof framing members, which could lead to damage to roofing.
This is to limit the probability of precipitation ingress, which could lead to deterioration, which could lead to compromised structural integrity of the roof, which could lead to harm to persons.
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