Skylight Replacement in Montreal: Everything You Need to Know

Thinking about skylight replacement in Montreal? Learn the signs of a failing skylight, costs, materials, and why Toitures Pro is the trusted choice for skylight installation in Montreal, Laval, and the West Island.

3/3/20262 min read

A skylight can transform any room — bringing in natural light, improving ventilation, and adding real value to your home. But in Montreal's demanding climate, freeze-thaw cycles, heavy snow loads, and UV exposure take a serious toll on skylight seals, frames, and glazing over time. Knowing when to replace your skylight can save you thousands in water damage, mold remediation, and structural repairs.

At Toitures Pro, we specialize in professional skylight replacement and installation for residential and commercial properties across Montreal, Laval, the West Island, and surrounding areas.

1. How Long Does a Skylight Last?

Most skylights last between 15 to 25 years, depending on materials, installation quality, and weather exposure. In Quebec, harsh winters accelerate wear significantly. If your skylight is approaching 20 years old, a professional inspection is strongly recommended — even without visible issues.

2. Signs Your Skylight Needs to Be Replaced

Watch for these warning signs:

Visible leaks or water stains around the frame
Condensation forming between double-pane glazing
Cracked, yellowed, or cloudy glazing
Drafts or cold air entering around the frame
Damaged or missing flashing
Bubbling of the surrounding roofing membrane
Increased energy bills due to heat loss

Delaying skylight replacement in Montreal can lead to significant water infiltration, mold growth, and costly interior repairs.

3. Skylight Replacement vs. Repair: Which Do You Need?

Minor issues like resealing flashing or replacing a gasket can extend your skylight's life by a few years. However, full replacement is recommended when:

The glazing is cracked, fogged, or structurally compromised
The frame is warped, corroded, or rotting
Water infiltration has damaged the surrounding roof deck
The skylight is more than 20 years old
Energy efficiency has noticeably declined
4. The Importance of Proper Flashing

Improper or deteriorated flashing is one of the most common causes of skylight leaks in Montreal. During a professional skylight replacement, correct flashing installation includes step flashing along the sides, saddle flashing at the upper edge, and a waterproof membrane extending beneath the roofing material. Always ensure your installation is carried out by a licensed roofing contractor who understands Montreal's specific drainage and weather requirements.

5. Flat Roofs vs. Sloped Roofs

On flat roofs, skylight installation requires a raised curb to prevent water from pooling around the base — especially critical during Montreal's heavy snowmelt season. On sloped roofs, water drains naturally away from the frame. Both require precise installation to ensure long-term weatherproofing and durability.

Should You Repair or Replace?

Not every skylight problem requires full replacement. However, if damage is widespread, the unit is aging, or energy efficiency has declined, replacement is the smarter long-term investment. A new skylight improves natural lighting, thermal performance, and property value.

Why Choose Toitures Pro in Montreal?

At Toitures Pro, we provide: