Dealing with a roof leak? Advice from your Orillia & Muskoka pros

A roof leak is one of the most stressful problems a homeowner faces. Left unaddressed, a small drip escalates into structural damage, mould and costly interior repairs.

Roofers repairing a leak on a residential roof

Published April 5, 2026 · A & G Roofing

A & G has spent almost 60 years helping neighbours across Orillia and Muskoka identify, trace and repair leaks. Here's how to spot one before it becomes a disaster.

1. Identify the tell-tale stains

Look for discoloration, "tea-coloured" rings, or soft spots on ceilings and upper walls. Bubbling paint or dampness around window frames can mean water is travelling down the wall studs.

2. Inspect the attic

During or just after a rainstorm, and only if it's safe, check the attic for wet or matted insulation and dark trails on the underside of the roof deck leading to a roofing nail. On a sunny day, turn the attic lights off and look for pinpricks of daylight — the "pinlight" test reveals holes.

3. Check the exterior safely

From the ground with binoculars, look for shingle damage (missing, curled or "balding" from granule loss), flashing failure around chimneys, skylights and valleys — the #1 leak zones — and clogged gutters that let water back up under the shingles.

4. The northern culprit: ice damming

In Orillia and Simcoe County, ice damming along the eaves is a frequent source of winter leaks as meltwater backs up under the shingles.

When to call a professional

Water often enters at one point and travels ten feet down a rafter before it drips onto the ceiling, which is why "ghost leaks" are so hard to trace. Our technicians find the root cause rather than patching the symptom, make CertainTeed-certified repairs that don't void your existing warranty, and work with professional fall-arrest gear. Call (705) 325-1805 if you suspect a leak.

Questions about your roof?

Request a free estimate or call (705) 325-1805 and our office will follow up.

Request a free estimate

Tell us about your roof and we'll follow up to book an on-site assessment. Prefer to talk? Call or text (705) 325-1805.

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