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9.28.6.5.(1)
ApplicationIntent
OH1OS2OS1OS3OP1
ObjectiveOH1 Indoor Conditions
Attribution
[F80-OH1.1,OH1.2,OH1.3]
Application
Application 1: 
Dampening of the base (second coat) prior to the application of the finish 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].
Exceptions: 
except for stone-dash finish coats.
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Intent
Intent 1: 
To limit the probability that the base coat will extract and absorb water from a relatively thin finish coat of stucco, which could lead to negative effects on curing of the finish coat, which could lead to an inadequate resistance to abrasion or freeze-thaw stresses, which could lead to delamination.
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, or
  • deterioration, which could lead to compromised integrity of exterior walls or elements protected by exterior walls.
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.
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