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9.27.9.5.(3)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Support for vertical butt joints of plywood siding applied in horizontal lapped strips, where sheathing is not used, on 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 inadequate support for butt joints, which could lead to:
  • an inadequate resistance to impact loads, which could lead to open joints, or
  • misalignment of vertical butt joints.
This is to limit the probability of precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of exterior walls or elements protected by exterior walls, which could lead to harm to persons.
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