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9.28.4.6.(3)
ApplicationIntent
OH1OS2OS1OS3OP1
ObjectiveOH1 Indoor Conditions
Attribution
[F20-OH1.1,OH1.2,OH1.3]
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.
This is to limit the probability of:
  • precipitation or meltwater ingress, or
  • compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • an inadequate control of temperatures of interior spaces or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls, or
  • water accumulation in interior spaces.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of 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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