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9.27.5.3.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3]
[F20-OS2.1,OS2.3,OS2.4] [F22-OS2.3,OS2.4,OS2.5] Applies where furring is used for the attachment of panel-type cladding installed to provide the required bracing.
Application
Application 1: 
Minimum dimensions of furring applied over sheathing for the attachment of cladding, 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.(5), which applies to double-course wood shingles or shakes that are permitted to be attached to a wood lath not less than 38 mm by 9.5 mm thick, over sheathing that is securely nailed to the framing, and applied as described in Article 9.27.7.5., and
  • Sentence 9.27.5.1.(6), which applies to asbestos-cement shingles fastened to a wood lath not less than 89 mm by 9.5 mm thick, over sheathing that is securely nailed to the framing, and applied so that it overlaps the preceding shingle course by not less than 20 mm.
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Intent
Intent 1: 
To limit the probability of inadequate anchorage for fasteners to resist:
  • gravity loads and lateral wind loads, or
  • where panel-type siding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i), lateral loads, which could lead to racking of exterior walls.
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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