| 9.20.13. |
Control of Rainwater Penetration |
| 9.20.13.1. |
Materials for Flashing
- Materials used for flashing shall conform to Table 9.20.13.1.
Table 9.20.13.1.
Flashing Materials
Forming Part of Sentence 9.20.13.1.(1)
- Aluminum flashing in contact with masonry or concrete shall be effectively coated or separated from the masonry or concrete by an impervious membrane.
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| 9.20.13.2. |
Fastening of Flashing
- Fastening devices for flashing shall be corrosion-resistant and, where metal flashing is used, shall be compatible with the flashing with respect to galvanic action.
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| 9.20.13.3. |
Location of Flashing
- Flashing shall be installed in masonry and masonry veneer walls
- beneath jointed masonry window sills,
- over the back and top of parapet walls,
- over the heads of glass block panels,
- beneath weep holes, and
- over the heads of window or door openings in exterior walls when the vertical distance between the top of a window or door frame and the bottom edge of the eave exceeds one-quarter of the horizontal eave overhang.
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| 9.20.13.4. |
Extension of Flashing
- When installed beneath jointed masonry window sills or over the heads of openings, flashing shall extend from the front edge of the masonry up behind the sill or lintel.
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| 9.20.13.5. |
Flashing for Weep Holes in Masonry/Masonry Walls
- Flashing beneath weep holes in cavity walls and masonry veneer/masonry backing walls shall
- be bedded not less than 25 mm in the inside wythe,
- extend to not less than 5 mm beyond the outer face of the building element below the flashing, and
- be installed with a nominally horizontal slope toward the outside wythe.
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| 9.20.13.6. |
Flashing for Weep Holes in Masonry Veneer
- Flashing beneath weep holes in masonry veneer over masonry backing walls shall conform to the flashing requirements for cavity walls and masonry veneer/masonry backing walls in Article 9.20.13.5.
- Flashing beneath weep holes in masonry veneer over wood-frame walls shall be installed so that it extends from a point not less than 5 mm beyond the outer face of the building element below the flashing to a point 150 mm up the wood-frame wall.
- Where the frame wall is sheathed with a sheathing membrane, a non-wood-based rigid exterior insulating sheathing or a semi-rigid insulating sheathing with an integral sheathing membrane, the flashing shall be installed behind the sheathing membrane or insulating sheathing.
- Flashing described in Sentence (2) is permitted to conform to the requirements for concealed flashing in Table 9.20.13.1.
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| 9.20.13.7. |
Flashing Joints
- Joints in flashing shall be made watertight.
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| 9.20.13.8. |
Required Weep Holes
- Weep holes spaced not more than 800 mm apart shall be provided at the bottom of
- cavities in cavity walls, and
- cavities or air spaces in masonry veneer walls.
- The cavities or air spaces described in Sentence (1) shall include those above lintels over window and door openings required to be flashed in conformance with Article 9.20.13.3.
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| 9.20.13.9. |
Protection of Interior Finish
- Except as provided in Sentence (3), where the interior finish of the exterior walls of a building is a type that may be damaged by moisture, exterior masonry walls, other than cavity walls or walls that are protected for their full height by a roof of a carport or porch, shall be covered on the interior surface with sheathing membrane conforming to CAN/CGSB-51.32-M, "Sheathing, Membrane, Breather Type," lapped not less than 100 mm at the joints.
- In situations described in Sentence (1), flashing shall be provided where water will accumulate, to lead it to the exterior.
- Where insulation that effectively limits the passage of water is applied by a waterproof adhesive or mortar directly to parged masonry, the requirements for sheathing membrane in Sentence (1) do not apply. (See Note A-9.20.13.9.(3).)
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| 9.20.13.10. |
Mortar Droppings
- Cavity walls shall be constructed so that mortar droppings are prevented from forming a bridge to allow the passage of rain water across the cavity.
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| 9.20.13.11. |
Caulking at Door and Window Frames
- The junction of door and window frames with masonry shall be caulked in conformance with Subsection 9.27.4.
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| 9.20.13.12. |
Drips beneath Window Sills
- Where no flashing is installed beneath window sills, such sills shall be provided with a drip not less than 25 mm from the wall surface.
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