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9.27.2.1.(1)
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 precipitation ingress into building assemblies or interior spaces.
Exceptions: 
except where:
  • exterior walls are protected from precipitation, or
  • it can be shown that precipitation ingress will not adversely affect occupant health or safety.
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Intent
Intent 1: 
To limit the probability of precipitation or meltwater ingress.
This is to limit the probability of deterioration, 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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