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9.28.6.3.(1)
ApplicationIntent
OH1OS2OS1OS3OP1
ObjectiveOS2 Structural Safety
Attribution
[F20,F80-OS2.3]
Application
Application 1: 
Minimum thickness of the first coat of stucco, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • drying before hydration is complete (or inadequate curing),
  • the inadequate embedment of lath, which could lead to the corrosion of lath, or
  • the excessive shrinkage of stucco under gravity or lateral loads, which could lead to cracking.
This is to limit the probability of an inadequate bond between lath and stucco, and the inadequate strength of stucco, which could lead to:
  • excessive moisture transfer by capillary action, or
  • inadequate strength to resist gravity, lateral, impact or abrasion loads, or freeze-thaw stresses.
This is to limit the probability of:
  • precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of exterior walls or elements protected by exterior walls, or
  • stucco detaching and falling from the building.
This is to limit the probability of harm to persons.
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