7 Common Roofing Problems in Ottawa (And How to Fix Them)

Ottawa homeowners know the drill: freeze, thaw, freeze again. Our climate is one of the harshest on roofing materials in Canada, and most roof problems don't announce themselves until water is already dripping through your ceiling.

The good news? Most of these issues are preventable — or at least manageable — if you catch them early. Here are the seven roofing problems we see most often across Ottawa Valley and Lanark County, and what you should do about each one.

Ice dams are the number one roofing complaint we hear from Ottawa homeowners every spring. They form when heat escapes through your attic, melts the snow on your roof, and that meltwater refreezes at the cold eaves. The ice backs up under your shingles and forces water into your home.

Signs you have an ice dam: Icicles hanging from your eaves, water stains on interior ceilings near exterior walls, or visible ridges of ice along your roofline.

What to do: The real fix is improving your attic insulation and ventilation — not just chipping away at the ice (which can damage shingles). A proper attic assessment will tell you where heat is escaping and what it will take to stop it.

Ottawa's freeze-thaw cycles are relentless from November through March. Water seeps into tiny cracks in aging shingles, freezes, expands, and splits the shingle further. Over several seasons, this turns minor surface wear into cracked, curling, or missing shingles.

Signs of shingle damage: Curling or cupping edges, cracked or brittle shingles, granules collecting in your gutters, or bare patches visible from the ground.

What to do: A few damaged shingles can be replaced individually. But if you're seeing widespread granule loss or curling across large sections, it's usually a sign the roof is nearing the end of its lifespan and a full replacement will be more cost-effective than ongoing patchwork.

Flashing is the metal sheeting that seals the joints around chimneys, skylights, vents, and valleys — anywhere two roof surfaces meet or a structure penetrates the roof. It's one of the most common sources of leaks, and one of the most overlooked.

Signs of flashing failure: Water stains on ceilings near a chimney or skylight, visible rust or separation around metal strips at roof joints, or caulking that has cracked and pulled away.

What to do: Flashing repairs are relatively straightforward when caught early. Left alone, a small flashing gap can allow water to rot the decking underneath, turning a $300 repair into a $3,000 one.

This one surprises a lot of homeowners — ventilation problems cause roofing damage from the inside out. Without proper airflow, heat and moisture build up in your attic. In summer, excessive heat degrades shingles from below. In winter, that trapped moisture condenses and rots the decking and rafters.

Signs of ventilation problems: Unusually high energy bills, ice dams forming regularly, a musty smell in the attic, or shingles that are aging faster than expected.

What to do: A ventilation assessment will identify whether you need additional soffit vents, ridge vents, or both. This is often done at the same time as attic insulation work and pays for itself quickly in energy savings and extended roof life.

Your gutters are part of your roofing system. When they're clogged with leaves and debris — which happens fast in the fall around Almonte, Perth, and Carleton Place — water backs up under your shingles and against your fascia boards. Over time, this causes rot, mould, and foundation issues.

Signs of gutter problems: Gutters pulling away from the fascia, water overflowing during rain, visible sagging, or plant growth inside the gutter channel.

What to do: Clean your gutters at least twice a year — once in late fall after the leaves drop, and once in spring. If your gutters are pulling away or showing rust, it may be time to replace them. Properly sloped gutters with downspouts that direct water well away from your foundation are a simple investment that protects your entire home.

The roof deck is the plywood or OSB sheeting that your shingles are nailed to. When moisture gets in — through failed flashing, ice dams, or poor ventilation — the deck can rot. Soft, spongy spots underfoot when walking on the roof are a telltale sign.

Signs of deck rot: Visible sagging or dips in the roofline, soft spots when walking on the roof, dark staining on attic rafters, or a musty smell in upper floors.

What to do: Deck rot needs to be addressed before new shingles go on. If you're replacing a roof and the contractor doesn't inspect the deck first, that's a red flag. Rotted sections need to be cut out and replaced — skipping this step means your new roof is sitting on a compromised foundation.

Ottawa Valley gets its share of summer hailstorms and high-wind events. Hail leaves circular dents in shingles that aren't always visible from the ground, but they break down the granule coating and dramatically shorten the life of the shingle. Wind can lift shingle edges and break the seal strips, allowing water infiltration.

Signs of storm damage: Dented or bruised shingles, missing shingles after a windstorm, granules washing into downspouts after a hailstorm, or dented metal flashing and gutters.

What to do: After any significant storm, it's worth having a professional inspection. Many homeowners don't realize their roof sustained hail damage until a year or two later when leaks start appearing. Documenting damage promptly also matters for insurance claims — most policies have time limits on storm damage claims.

A few loose shingles after a windstorm might be a quick fix. But if you're seeing multiple issues at once — or if your roof is more than 15–20 years old — it's worth getting a professional inspection before the next Ottawa winter arrives.

At Clean Slate Roofing & Renovations, we offer free inspections for homeowners across Ottawa Valley and Lanark County. We'll give you an honest assessment of what needs attention now, what can wait, and what the most cost-effective path forward looks like.

Don't wait for a drip to become a flood. Reach out to our team at [email protected] or call us at (343) 552-8198 — we're here seven days a week.