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Stains on exterior walls indicate water has penetrated behind the siding. In Vancouver’s wet winters, improper window and door flashing allows moisture to rot the opening before it’s visible.
Proper detailing is crucial before new siding or paint. Once cladding is installed, fixing a poor seal requires cutting into finished work. Many older homes in this area need their openings inspected before replacement.
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| Window and Door Flashing Vancouver Flashing Material Type | Sill Pan Flashing Prices | Head Flashing Prices | Weather Barrier Flashing Prices | Fully Adhered Flashing Tape Prices |
|---|---|---|---|---|
| PVC Flashing | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 60 | CAD 60 – CAD 110 |
| Galvanized Steel Flashing | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 60 | CAD 60 – CAD 110 |
| Standard Steel Flashing | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 60 | CAD 60 – CAD 110 |
| Aluminum Flashing | CAD 20 – CAD 50 | CAD 20 – CAD 40 | CAD 40 – CAD 60 | CAD 60 – CAD 110 |
| Prefinished Aluminum Flashing | CAD 20 – CAD 50 | CAD 10 – CAD 20 | CAD 40 – CAD 60 | CAD 60 – CAD 110 |
Moisture protection for exteriors
Water often seeps in around windows and doors not because of a failing frame. The issue usually lies in the area where the opening meets your exterior walls. Proper flashing directs rain away before it can soak into the sheathing or framing. This can mean the difference between a persistent stain and a truly dry wall assembly.
We install layered flashing systems that work with your existing weather barrier. Each piece overlaps the one below it, allowing water to drain down and away. This creates a continuous drainage plane behind your siding, which is key to long-lasting exterior durability. For a closer look at how this works, see our approach to window and door flashing in Vancouver.
Vancouver’s long rainy season tests every exterior opening. One winter can push more water against your walls than some places see in ten years. If the flashing wasn’t installed with this constant moisture in mind, damage can start early and spread quickly.
Older homes in Vancouver often have original flashing that can’t handle modern wind-driven rain. Even newer buildings can have problems if the installer cut corners on the sill pan or head flashing. We consider the city’s unique exposure patterns, making sure every opening can manage the heavy rain we get from October to April.
Flashing Installation in Vancouver
In Vancouver, we start window and door flashing with sloped sill pan flashing. This is made from metal or a strong self-adhered membrane. The pan has end dams that direct water outward, stopping it from moving sideways into the wall. Next, we apply flexible flashing tape up the jambs. This tape overlaps the sill pan so water drains onto it instead of behind it.
We place head flashing over the window or door. It is tucked under the weather-resistant barrier and sloped outward with a drip edge. In Vancouver’s rainy weather, these flashings often work with a rainscreen gap behind the cladding. This setup helps any moisture drain and dry. For older homes with stucco or wood siding, we may use liquid-applied flashing. This bonds directly to the sheathing for a tight seal.
The main idea behind window and door flashing is to create a continuous drainage plane. In Vancouver, where rain can be heavy, every layer must direct water to the outside. Flashing laps function like shingles: each piece overlaps the one below it, allowing gravity to move moisture down and out without trapping it behind the cladding.
Capillary action can pull water into small gaps. A well-designed sill pan stops that capillary action, while back-dams and weep holes give water a way to escape. The assembly must let the wall dry to the outside, so flashings are vapor-permeable when needed. This helps prevent condensation buildup in Vancouver’s damp conditions.
