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9.27.5.1.(4)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3]
Application
Application 1: 
Asbestos-cement shingles 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].
Exceptions: 
except as stated in:
  • Sentence 9.27.5.1.(1), which applies to cladding that is fastened to framing, furring or blocking, and
  • Sentence 9.27.5.1.(6), which applies to asbestos-cement shingles fastened to wood lath nailed to framing.
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Intent
Intent 1: 
To limit the probability of fastening cladding to an inappropriate substrate, which could lead to an inadequate resistance to expected gravity loads and lateral wind loads.
This is to limit the probability of:
  • the displacement of cladding, trim and flashing, the opening of joints or the 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.
Intent 2: 
To supersede the fastening requirement stated in Sentence (1) and allow some cladding materials to be fastened to sheathing where the sheathing offers sufficient strength to support the specific cladding material.
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