Division B
Acceptable Solutions

Part 5 — Environmental Separation

Section 5.6. Precipitation

change begin(See Appendix A and Part 10.)change end

5.6.1. Protection from Precipitation

5.6.1.1. Required Protection from Precipitation
(See Appendix A.)
1) change beginWherechange end a building component or assembly is exposed to precipitation, the component or assembly shall
a) minimize ingress of precipitation into the component or assembly, and
b) prevent ingress of precipitation into interior space.

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2) change beginDeleted.change end

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5.6.1.2. Installation of Protective Materials
1) Intent StatementWhere 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) Intent StatementWhere masonry applied to vertical assemblies is installed to provide required protection from precipitation, installation shall conform to the requirements of CAN/CSA-A371, “Masonry Construction for Buildings.”
3) change beginWhere 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.)

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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.)change end

5.6.2. change beginDeletedchange end Drainage, Accumulation and Disposal

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5.6.2.1. change beginDeletedchange end Drainage

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(See Appendix A.)
1) change beginMaterials,change end components, assemblies, joints in materials, junctions between components and junctions between assemblies exposed to precipitation shall be
a) change begindesigned to shed precipitation, andchange end
b) drained to direct precipitation to the exterior.

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2) change beginDeleted.change end

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5.6.2.2. Accumulation and Disposal
1) Intent StatementWhere 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 Article 2.4.10.4. of Division B of Book II (Plumbing Systems) of this change beginBy-lawchange end.

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3) Intent StatementWhere 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) Intent StatementJunctions 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) change beginWhere a roof or balcony is entirely enclosed by parapet walls, there shall be a sufficient number of overflow outlets installed in the parapet walls in order to properly drain the roof or balcony in the event that any rainwater conductors become obstructed. (See Appendix A.)change end