9.26.9.3.(1)

Objective

OH1 Indoor Conditions

Attribution

Intent

Intent 1:

To limit the probability of:

  • if shingles were too short, insufficient overlap of wood shingles at the desired exposure, which could lead to an insufficient number of shingle plies over the roof surface, which could lead to coinciding defects,
  • if shingles were too narrow, splitting, exposed joints or defects in underlying courses at joints between shingles or shakes, or
  • if shingles were too wide, shrinkage and cracking.

This is to limit the probability of:

  • water penetrating directly to roof decking or sheathing, 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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