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9.19.1.2.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F62,F51-OS2.3]
Application
Application 1: 
Vent areas for attic or roof spaces, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where:
  • insulation is installed above the ceiling and below the roof sheathing,
  • the roof slope is 1 in 6 or greater, and
  • the roof is not constructed with roof joists.
Exceptions: 
except:
  • where attic or roof space venting can be shown to be unnecessary, and
  • as stated in Sentence 9.19.1.4.(1), which applies to the lower portions of mansard or gambrel roofs.
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Intent
Intent 1: 
To limit the probability of an inadequate vent area for roofs, which could lead to:
  • condensation,
  • the accumulation of moisture, or
  • the formation of ice dams.
This is to limit the probability of deterioration, which could lead to compromised structural integrity of attic or roof assemblies or of elements protected by attic or roof assemblies, which could lead to harm to persons.
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