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9.28.1.1.(1)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Substrate for stucco applied over wood-frame walls, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except as stated in Sentence 9.28.4.2.(1), which applies where not less than 1.19 mm diam galvanized wire is applied horizontally to the framing at vertical intervals of not more than 150 mm, or where paper-backed welded wire metal lath is used.
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Intent
Intent 1: 
To limit the probability of inadequate backing support, which could lead to inadequate strength to resist impact or other lateral loads, which could lead to the excessive deformation or cracking of stucco.
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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