Back5.6.1.2.(2)

ATTRIBUTION:

Functional Statement:

F61

To resist the ingress of precipitation, water or moisture from the exterior or from the ground.

Objective:

OH1.1, OH1.2, OH1.3

 

APPLICATION:

Grades of western cedar shakes and shingles installed as undercoursing to provide protection from precipitation on vertical assemblies exposed to precipitation.
This applies to building materials, components, assemblies and their interfaces described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
This also applies to cladding assemblies installed on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] where:
  • the cladding assembly is not addressed in Section 9.27., or
  • the cladding assembly does not comply with the prescriptive requirements of Section 9.27.

INTENT:

To limit the probability of defects such as loose knots, large holes, cross-grain areas or checks, which could lead to unevenness or compromised integrity of the undercoursing, which could lead to a reduction in the watertightness of shingle or shake cladding, which could lead to precipitation ingress.
This is to limit the probability of:
  • the inadequate control of relative humidity 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 environmental separators.
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.

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F61

To resist the ingress of precipitation, water or moisture from the exterior or from the ground.

Objective:

OS2.3

 

APPLICATION:

Grades of western cedar shakes and shingles installed as undercoursing to provide protection from precipitation on vertical assemblies exposed to precipitation.
This applies to building materials, components, assemblies and their interfaces described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
This also applies to cladding assemblies installed on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] where:
  • the cladding assembly is not addressed in Section 9.27., or
  • the cladding assembly does not comply with the prescriptive requirements of Section 9.27.

INTENT:

To limit the probability of defects such as loose knots, large holes, cross-grain areas or checks, which could lead to unevenness or compromised structural integrity of the undercoursing, which could lead to a reduction in the watertightness of shingle or shake cladding, which could lead to precipitation ingress, which could lead to deterioration, which could lead to structural failure, which could lead to harm to persons.