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9.26.2.2.(4)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Material and minimum head diameter and shank thickness of nails used to fasten wood shingles or shakes, on roofs of 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:
  • nail head pull-through,
  • nail shanks having an inadequate resistance to withdrawal from their substrate, or
  • an inadequate resistance to corrosion on exposure to water from rain, or melting snow or ice, or to chemicals (introduced or naturally occurring).
This is to limit the probability of the displacement of roofing materials and components, which could lead to:
  • 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 relative humidity, temperatures of interior spaces or water accumulation,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of roofs or assemblies protected by roofs.
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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