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9.27.3.8.(2)
OS2OH1OS2OH1
ObjectiveOS2 Structural Safety
Attribution
(a),(b)(ii),(c)(i) [F61-OS2.3] Applies to detailing of horizontal joints.
Application
Application 1: 
Flashing for horizontal joints in cladding, and where cladding substrates change and the substrates differ sufficiently for stresses to be concentrated along the horizontal line of change, in cladding assemblies to which Subsection 9.27.3. applies [see Article 9.27.1.1. for application of Subsection 9.27.3.], and:
  • where the upper cladding units overlap the lower cladding units by not less than 25 mm,
  • where the horizontal detail is constructed so as to minimize the ingress of precipitation into the air space, or
  • for horizontal joints in stucco, where the joint is finished with an expansion-contraction strip.
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Intent
Intent 1: 
To limit the probability of precipitation or meltwater ingress at horizontal joints between cladding elements.
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.
Intent 2: 
To limit the application of Sentence 9.27.3.8.(1), where the wall assembly is constructed such that:
  • precipitation or meltwater ingress at horizontal joints will be minimized, or
  • moisture that bypasses the cladding will be dissipated.
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