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9.27.2.1.(2)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Design and construction of exterior walls to which Subsection 9.27.2. applies [see Article 9.27.1.1. for application of Subsection 9.27.2.], with respect to mechanisms of deterioration.
Exceptions: 
except where exterior walls are protected from specific mechanisms of deterioration.
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Intent
Intent 1: 
To limit the probability that environmental separators will deteriorate at an unacceptable rate, which could lead to their premature failure, which could lead to:
  • precipitation or meltwater ingress, or
  • condensation.
This is to limit the probability of deterioration of the building structure, which could lead to structural failure of exterior walls or elements supported or protected by exterior walls, which could lead to harm to persons.
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