Why Is My Roof Leaking? Common Causes, Warning Signs & Repair Tips
Roof leaks never start big. They always start small.
Main reasons your roof is leaking
1. Damaged or Missing shingles
Shingles are the first layer of protection for your roof. If they break, crack, or fall off due to wind or age, rainwater can enter the roof structure.
2. Aging roof
Most roofs last 15–25 years. After this time, materials weaken naturally and small cracks start forming.
3. Clogged gutters
When gutters are full of leaves or ice, water cannot flow properly. It starts overflowing and enters roof edges.
4. Ice and snow damage (very common in Canada)
Snow melts and freezes again, creating ice dams. These block water flow and push water under shingles.
5. Damaged flashing
Flashing is metal installed around chimneys, vents, and roof edges. If it is loose or cracked, water enters easily.
Early warning signs of a roof leak
- Water stains on ceiling
- Paint peeling inside home
- Damp smell in attic
- Small dripping during rain
- Mold spots on walls or ceiling
Even one of these signs means your roof needs attention.
What happens if you ignore a leak
Ignoring a leak can lead to:
- Rotting wood inside roof
- Mold growth (health risk)
- Ceiling collapse in severe cases
- Very expensive repairs
A $300 repair can turn into thousands if ignored.
What you should do immediately
- Place a bucket under the leak
- Move furniture away from wet areas
- Do NOT climb the roof in rain or snow
Call a roofing professional
We inspect at no charge, find the real cause of leaks, and fix them before they become serious damage.
A leaking roof can cause serious moisture and mould problems inside your home if it is not repaired on time. To learn more about preventing moisture damage and protecting indoor air quality, read the official Health Canada guide on moisture and mould prevention: Health Canada – Guide to Addressing Moisture and Mould Indoors