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Common causes of roof leaks in Ontario
A roof leak is stressful, but it doesn’t always mean you need a new roof. Findlay Roofing provides practical, long-lasting roof repairs across the GTA, Golden Horseshoe and rural Southwest Ontario — focusing on correct diagnosis, proper flashing, and clean workmanship.
Best for:
- Active leaks or water stains on ceilings/walls
- Missing, lifted, or cracked shingles
- Wind damage and blow-offs
- Chimney, vent, skylight, or valley leaks
- Small flat-roof leaks on porches/additions
Need certainty first? We’ll inspect the full roofing system and tell you plainly whether a repair is the right call — or if replacement is the smarter investment.
Roof repairs that stop leaks fast — without pushing a full replacement
Most leaks aren’t caused by “bad shingles.” They’re usually caused by transition points where different roof elements meet.
The most common repair issues we see
- Nail pops and shingle blow-offs after wind events
- Flashing failures at chimneys, walls, dormers, and step flashing
- Plumbing vents with cracked rubber boots or loose seals
- Valleys with worn shingles, debris buildup, or exposed nails
- Skylights with aging seals or incorrect flashing
- Ice damming and freeze/thaw movement at eaves
What our roof repair service includes
Every repair starts with finding the real source of the problem.
1) Inspection & leak tracing
We inspect from the roof surface and from inside (attic/upper ceilings where accessible) to identify where water is entering — and where it’s showing up.
2) Clear repair recommendations
You’ll get a straightforward explanation of:
- What failed
- What we recommend fixing (and why)
- What we’d watch in the future
- Whether the roof is a candidate for repair or nearing end-of-life
3) Professional repair work
Depending on the issue, repairs may include:
- Replacing shingles and re-sealing exposed fasteners
- Rebuilding flashing details (chimneys, walls, dormers)
- Replacing vent boots, pipe collars, and caps
- Valley repairs and water-tight underlayment improvements
- Small flat-roof patching where appropriate
When a repair makes sense (and when it doesn’t)
A repair is typically a good fit when:
- The roof is generally in solid condition
- The leak source is localized (flashing/penetration/valley)
- There’s no widespread shingle failure or major decking rot
Replacement is often smarter when:
- The roof is near the end of its expected lifespan
- Shingles are brittle, heavily granule-lost, or curling across large areas
- Multiple leaks are appearing across different roof sections
Frequently Asked Questions
Can you repair a roof in winter?
Often, yes — some repairs are weather-dependent. We’ll be honest about what’s safe, what will hold, and when conditions require waiting.
If I have one leak, do I need a whole new roof?
Not always. Many leaks are flashing-related and very repairable.
Will you repair roofs you didn’t install?
Yes. We regularly repair roofs installed by other contractors.