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9.27.3.8.(1)
ApplicationIntent
OS2OH1OS2OH1
ObjectiveOS2 Structural Safety
Attribution
(a),(b),(c)(i) [F61-OS2.3]
Application
Application 1: 
Installation of flashing, on cladding assemblies to which Subsection 9.27.3. applies [see Article 9.27.1.1. for application of Subsection 9.27.3.], at:
  • horizontal junctions between cladding elements,
  • horizontal offsets in the cladding, and
  • horizontal lines where the cladding substrates change and the substrates differ sufficiently for stresses to be concentrated along that line.
Exceptions: 
except as stated in:
  • Clause 9.27.3.8.(2)(a), which applies where the upper cladding units overlap the lower cladding units by not less than 25 mm,
  • Clause 9.27.3.8.(2)(b), which applies where the cladding above and below the joint is outboard of a drained and vented air space and the horizontal detail is constructed so as to minimize the ingress of precipitation into the air space, and
  • Clause 9.27.3.8.(2)(c), which applies to horizontal joints in stucco where the joint is finished with an expansion-contraction strip and the cladding is installed outboard of a drained and vented air space.
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Intent
Intent 1: 
To limit the probability of precipitation or meltwater ingress at horizontal joints and offsets in cladding.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of exterior walls or elements protected by exterior walls, which could lead to harm to persons.
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