- #Ontario building code sill flashing install#
- #Ontario building code sill flashing series#
- #Ontario building code sill flashing windows#
Figure 8. Install trim and cap flashing above the window. Cover top edge of membrane with sheathing tape. Cover top edge of cap flashing with adhesive membrane strip.
#Ontario building code sill flashing install#
Above top trim, install cap flashing that extends past trim.
Install trim that has been painted or primed on all sides. #Ontario building code sill flashing series#
(Source: Building America Best Practices Series Volume 12.) Figure 7. Air seal the rough opening around the window from the inside.
On the interior side of the window, seal the gap between the window and the rough opening with backer rod or non-expanding foam and caulk. See Figure 6.įigure 5. Flash the sides and top of the window. Tape bottom edge of housewrap across the top window flange and tape down corner seams of housewrap. Unfold the housewrap and lay over the head flashing. Install self-adhesive head flashing extending 1 inch beyond the jamb flashing. Install self-adhesive jamb flashing extending 4 inches above the top of the head flange and even with the bottom of the sill flashing. Install the window plumb, level, and square following manufacturer’s specifications.įigure 4. Caulk the top and sides of the window rough opening, but not the bottom. Caulk the outside edges of the head and side jambs and install the window. (Source: Pan Flashing for Exterior Wall Openings.) Figure 3. Three types of window pan flashing with back dams. Other options for pan flashing include self-adhered non-elastic membrane (see Figure 3), which must be cut and patched at corners, two-piece rigid manufactured pan flashing, which comes with a built-in back dam that must be protected from breakage during window installation, or asphalt-based liquid flashing which is applied with a paint brush or roller. Make sure to press the membrane tightly into the corners to avoid tears later when the window is installed. Begin pressing in the middle of the sill and work toward the sides, removing adhesive covering strips as you go. Sloped pans are required if the sill depth is greater than 6 inches according to ASTM E212207. First install a back dam consisting of a strip of wood or beveled siding nailed along the back (inside) edge of the rough opening (over the flap of housewrap). (Source: Building America Best Practices Series Volume 12.)įor pan or sill flashing, use formable flashing, a stretchable self-adhered membrane that bends at corners so one continuous piece can be used to cover the bottom and sides of the sill. Figure 2. Install self-adhesive sill flashing in the window rough opening. Install back dam and self-adhesive flashing at sill. Figure 1. Cut an I in the house wrap over the window rough opening. Fold it up to expose the sheathing and loosely tape it in place out of the way. Above the window opening, cut a head flap. Fold the side and bottom flaps into the window opening and secure. Cut the house wrap covering the rough opening in the shape of a modified "I." See Figure 1. Other Considerations: When designing the home, walls and doors should be located under overhangs or porch roofs whenever possible these features protect against rain and snow and also minimize unwanted solar heat gain by blocking out high summer sun.Īir and water leaks around doors during high wind events can contribute to building failures see the Climate tab for more information. This task should be included in the contract for the appropriate trade depending on the workflow at the specific job site. #Ontario building code sill flashing windows#
Properly installed flashing that is integrated with the other elements of the wall can help prevent water damage.įlashing materials may be installed by insulators, framers, or subcontractors or vendors hired specifically to install the windows and doors. The wall framing around windows and doors must be protected from any water that finds its way behind the siding at these locations and the water must be directed out to prevent damage to the rest of the wall. Many a homeowner has suffered from water intrusion around doors and windows, often not discovered until considerable damage has been done within the wall. Windows and doors are an interruption in the wall’s house wrap or insulated sheathing drainage plane and thus are a vulnerable spot for water leakage.
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