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Moisture can quickly damage window and door frames. In a damp climate, a soft frame spreads trouble to nearby trim and siding, lifting paint and inviting mold. Capping seals that edge before the repair bill climbs.
For older homes, this upgrade creates neat, clean exterior lines. It hides faded, mismatched trim and gives every opening a sharper finish that requires less upkeep.
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| Window and Door Capping Thornhill Capping Material Grade | Arched Window Prices | Bay Window Prices | High-Access Second-Story Prices | Mitered Corner Prices |
|---|---|---|---|---|
| Heavy-Gauge Aluminum Coil | CAD 1,600 – 4,000 | CAD 1,400 – 3,600 | CAD 1,500 – 3,900 | CAD 1,200 – 3,200 |
| Thin-Gauge Aluminum Coil | CAD 1,200 – 3,000 | CAD 1,100 – 2,800 | CAD 1,200 – 3,000 | CAD 900 – 2,500 |
| Vinyl-Coated Aluminum Coil | CAD 1,500 – 3,700 | CAD 1,300 – 3,300 | CAD 1,400 – 3,600 | CAD 1,100 – 2,900 |
| Standard-Gauge Aluminum Coil | CAD 1,400 – 3,400 | CAD 1,200 – 3,000 | CAD 1,300 – 3,300 | CAD 1,000 – 2,700 |
Durable Protection Against Moisture
When window and door frames are exposed, they soak up water and start to decay. Capping covers those weak spots with a custom aluminum shell that sheds rain before it can get in.
Our teams bend the metal on-site to fit your exact trim profiles. They fasten it tightly against the existing frame. You get a clean, low-maintenance finish that prevents rot for decades without needing paint. It’s the same method we use for window and door capping in Vancouver, improved over hundreds of homes.
Thornhill’s location near the Coast Mountains means it gets heavy, wind-driven rain from October to March. Wood trim around windows and doors doesn’t dry out during those months, which speeds up swelling and rot.
Many homes here were built in the 1980s and 1990s, when builders used untreated finger-jointed pine for exterior trim. That material breaks down quickly when moisture gets in. Capping gives those older Thornhill homes a second chance by sealing every exposed face from the weather.
Capping Installation in Thornhill
We use .024-inch pre-painted aluminum coil that resists corrosion from Thornhill’s heavy rains. Our installers bend it on site with a portable brake to fit your window and door trim profiles. The cap wraps around the head, jambs, and sill, extending past the bottom edge to create a drip line that directs water away from the wood. We seal joints at corners with exterior-grade polyurethane sealant to keep wind-driven moisture out.
For homes with existing rot, we treat the wood with a borate-based preservative before capping. The aluminum is secured with stainless steel trim nails and a continuous bead of sealant under the top edge. A small space behind the cap allows any trapped moisture to escape, preventing condensation that could rot the frame from the inside.
In Thornhill’s rainy climate, the building envelope needs a water-shedding surface that works with the wall assembly. Capping serves as a secondary drainage plane over the trim, lapped under the siding’s weather-resistant barrier at the top and flanged over the window flange at the sides. This layering ensures that any water hitting the capping drains down and out, never behind the frame.
The aluminum’s thermal movement is managed by slip joints at long runs, and its non-porous surface stops moisture absorption. By adding a ventilation gap behind the capping, we prevent vapor build-up that could cause rot in the original wood. This method is standard for wet climates, where protecting the structural integrity of window openings is essential for overall wall performance.
