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9.27.5.1.(7)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Installation of wood lath used for the attachment of asbestos-cement shingles over sheathing that is not suitable for direct attachment, installed as part of a cladding system, 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 an insufficient length of overlap to permit the secure fastening of the top edges of asbestos-cement shingles, which could lead to inadequate anchorage for fasteners to resist gravity loads and lateral wind loads.
This is to limit the probability of the displacement of cladding, trim and flashing, opening of joints or failure of caulking, which could lead to:
  • 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, or
  • falling cladding components.
This is to limit the probability of harm to persons.
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