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9.27.5.1.(1)
ApplicationIntent
OS2OP2OH1OH4OS3
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1,OP2.3,OP2.4] [F22-OP2.3,OP2.4,OP2.5] Applies where panel-type cladding is installed to provide the required bracing.
Application
Application 1: 
Fastening of lumber, wood shingles, shakes, fibre-cement shingles, planks and sheets, plywood, oriented strandboard, waferboard, hardboard, vinyl, aluminum and steel, including related trim and soffits, asphalt shingles or stucco installed as cladding on wood-frame walls exposed to precipitation, 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.(2), which applies to vertical lumber and stucco lath or reinforcing attached to the sheathing,
  • Sentence 9.27.5.1.(3), which applies to vertically applied metal siding and wood shingles and shakes attached to the sheathing,
  • Sentence 9.27.5.1.(4), which applies to asbestos-cement shingles attached to the sheathing,
  • Sentence 9.27.5.1.(5), which applies to wood shingles or shakes that are attached to a wood lath, and
  • Sentence 9.27.5.1.(6), which applies to asbestos-cement shingles that are fastened to a wood lath.
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Intent
Intent 1: 
To limit the probability of fastening cladding to an inappropriate substrate.
Where panel-type siding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i), this is to limit the probability of an inadequate resistance to lateral loads, which could lead to racking of exterior walls, which could lead to:
  • the deformation of the building, or
  • 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.
This is to limit the probability of:
  • the space being unsuitable for its intended use,
  • compromised operation of windows and doors, or
  • damage to the building.
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