(See Appendix A.) (See Part 10)
[Rev. 2, B.C. Reg. 73/2008.]
1) [ . . . ] Where a building component or assembly is exposed to precipitation, the component or assembly shall
a)minimize ingress of precipitation into the component or assembly,
b)prevent ingress of precipitation into interior space, and
c)be designed to drain any accumulated water to the exterior.
2) Deleted.
1) Except as provided in Sentence (2), where western cedar shakes or shingles are installed to provide the
required protection from precipitation,
a)the shakes shall be not less than No. 1 or Handsplit grade, and
b)the shingles shall be not less than No. 2 grade.
2) Where western cedar shakes or shingles are installed
as undercoursing to provide the required protection from
precipitation on vertical assemblies, they shall be not less
than No. 3 grade.
3) Except as provided in Sentence (4), where eastern white cedar shingles are installed to provide the
required protection from precipitation, they shall be not less
than B (clear) grade.
4) Where eastern white cedar shingles are installed as
undercoursing to provide the required protection from
precipitation on vertical assemblies, they shall be not less
than C grade.
1) Where a material applied to a sloped or horizontal
assembly is installed to provide required protection from
precipitation and its installation is covered in the scope of
one of the standards listed below, installation shall conform to
the requirements of the respective standard:
a)CAN/CGSB-37.51-M, “Application for Hot-Applied Rubberized Asphalt for Roofing and Waterproofing”,
b)CGSB 37-GP-55M, “Application of Sheet Applied Flexible Polyvinyl Chloride Roofing Membrane”,
c)CAN3-A123.51-M, “Asphalt Shingle Application on Roof Slopes 1:3 and Steeper”, or
d)CAN3-A123.52-M, “Asphalt Shingle Application on Roof Slopes 1:6 to Less Than 1:3”.
2) Where masonry applied to vertical assemblies is
installed to provide required protection from precipitation,
installation shall conform to the requirements of CSA A371, “Masonry
Construction for Buildings”.
3) Where protective materials applied to assemblies are installed to provide the required
protection from precipitation, the materials shall be installed to shed precipitation,
minimize its entry into the assembly, prevent its penetration through the assembly
and drain any accumulated water to the exterior. [See Appendix A.]
4) Flashings, drips, or overhangs shall be incorporated to deflect accumulated water from the building face where there are changes in planes of walls and roofs, changes in cladding material, or window or door heads or sills. [See Appendix A.]
1) [ . . . ] Materials, components, assemblies, joints in materials,
junctions between components and junctions between assemblies
exposed to precipitation shall be
a)designed to shed precipitation, and
b)drained to direct precipitation to the exterior.
2) Deleted.
1) Where water, snow or ice can accumulate on a
building, provision shall be made to minimize the likelihood of hazardous conditions arising from
such accumulation.
2) Where precipitation can accumulate on sloped
or horizontal assemblies, provision shall be made for
drainage conforming with the relevant provincial or
territorial regulations or municipal bylaws or, in the
absence of such regulations or bylaws, with Article 2.4.10.4. of Division B of the National
Plumbing Code of Canada 2005.
3) Where downspouts are provided and are not connected to
a sewer, provisions shall be made to
a)divert the water from the building, and
b)prevent soil erosion.
4) Junctions between vertical assemblies, and sloped or
horizontal assemblies, shall be designed and constructed to
minimize the flow of water from the sloped or horizontal
assembly onto the vertical assembly.
5) Where a roof or balcony is entirely enclosed by parapet walls, a sufficient number
of overflow outlets shall be installed in such parapet walls to drain the roof or
balcony in the event that any rainwater conductors become obstructed. [See Appendix A.]