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9.28.4.6.(3)
OH1OS2OS1OS3OP1
ObjectiveOS1 Fire Safety
Attribution
[F20-OS1.1] Applies where stucco is applied to masonry chimneys.
Application
Application 1: 
Fastener patterns for stucco lath applied to vertical surfaces, 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 9.28.4.6.(2), which applies where fasteners are spaced at not more than:
  • 150 mm o.c. vertically and 400 mm o.c. horizontally, or
  • 100 mm o.c. vertically and 600 mm o.c. horizontally.
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Intent
Intent 1: 
To limit the probability of an inability to resist gravity and lateral loads, which could lead to the detachment of lath, which could lead to the cracking of stucco.
Where stucco is applied to masonry chimneys, this is to limit the probability of precipitation or meltwater ingress, which could lead to the premature failure of chimney liners, which could lead to the escape of heat or flames, which could lead to the ignition of combustible building components, which could lead to harm to persons.
Intent 2: 
To exempt constructions from the application of Sentence 9.28.4.6.(2), where an alternative acceptable nailing pattern is used.
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