9.27.3.1.(3)

Objective

OS2 Structural Safety

Attribution

Intent

Intent 1:

To limit the probability of:

  • precipitation or meltwater ingress through the second plane of protection, and
  • an inadequate dissipation to the exterior of precipitation or meltwater that does bypass the first plane of protection.

This is to limit the probability of deterioration, which could lead to the structural failure of exterior walls or elements supported or protected by exterior walls, which could lead to harm to persons.

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