Ontario experiences some of the most unpredictable and extreme weather in Canada. From icy winters to humid summers and violent windstorms, your roof takes a beating year-round. If you’re a homeowner in Ontario, understanding how the climate affects your roof—and how to protect it—can save you thousands in repairs.
1. Winter: Snow Loads and Ice Dams
❄️ The Problem:
Heavy snow accumulation can add significant weight to your roof, particularly if it’s flat or has poor drainage. The bigger threat, however, is ice dams—when snow melts from attic heat and refreezes at the eaves, causing water to back up under the shingles.
🛠️ What to Do:
- Insulate and ventilate your attic to maintain an even roof temperature.
- Install ice and water shield membranes along eaves during roof replacement.
- Use a roof rake to remove snow from edges after major storms.
2. Spring: Freeze-Thaw Cycles and Rain Damage
🌧️ The Problem:
Ontario’s early spring is notorious for rapid temperature swings, which cause water to freeze and thaw in small cracks or under shingles. This leads to shingle damage and roof leaks. Add in spring rains and your roof may be vulnerable to moisture infiltration.
🛠️ What to Do:
- Inspect your roof for cracked shingles and flashing each spring.
- Clear gutters and downspouts to allow proper drainage.
- Seal any minor cracks or gaps with roofing caulk.
3. Summer: UV Rays and Heat Stress
☀️ The Problem:
Don’t underestimate Ontario’s summer sun. UV rays can cause roofing materials—especially asphalt shingles—to dry out, crack, and lose their protective granules. Combined with high humidity, this leads to premature aging of your roof.
🛠️ What to Do:
- Choose UV-resistant roofing materials like metal or fiberglass shingles.
- Schedule regular inspections to identify sun damage early.
- Keep trees trimmed to reduce direct sun exposure and debris accumulation.
4. Fall: Windstorms and Debris Buildup
🍂 The Problem:
Ontario often sees high winds in the fall, sometimes with storm-force gusts. These can lift or tear shingles and blow debris onto your roof. Clogged gutters from falling leaves can also trap moisture at the roofline.
🛠️ What to Do:
- Secure loose shingles and flashing before the fall storm season.
- Clean gutters and downspouts regularly.
- Install gutter guards to prevent clogs and water backup.
5. Year-Round Threat: Moisture and Mold
💧 The Problem:
Ontario’s varying humidity levels and precipitation make moisture buildup a year-round concern. Water that seeps into roofing layers can lead to rot, mold, and structural damage if left unchecked.
🛠️ What to Do:
- Ensure proper attic ventilation to control moisture levels.
- Fix small leaks immediately to prevent long-term damage.
- Use mold-resistant underlayment when replacing your roof.
Bonus: Professional Roof Inspections Save Money
Ontario homeowners should consider getting a professional roof inspection at least once a year, especially after a harsh winter or major storm. An expert eye can catch problems early—before they become expensive repairs.
Final Thoughts
Ontario’s weather puts your roof to the test in every season. But with proactive maintenance and smart material choices, you can dramatically extend your roof’s lifespan and performance. Whether you’re preparing for winter or recovering from a summer storm, taking care of your roof means protecting your entire home.