That thick ridge of ice at your roof's edge isn't caused by the cold — it's caused by heat escaping into your attic. Here's how to prevent ice dams the right way.
Get a free instant quote. Our inspection ties roof, attic, and ventilation together so you know if ice dams are a fluke or a built-in problem.
An ice dam forms when heat escaping into the attic warms the roof deck and melts the snow on top. That meltwater runs down to the cold eaves — which have no attic heat beneath them — and refreezes into a ridge of ice. Water then pools behind the dam and is pushed up under the shingles, leaking into the attic and ceilings. The cause is almost always attic heat loss and poor ventilation, which is why blaming the weather misses the point. See our deep dive in the defect library.
Lasting prevention comes from keeping the roof deck cold and even.
Sealing gaps around lights, ducts, and the attic hatch stops warm air from leaking up to the roof deck — the single most effective step.
Bringing attic insulation up to recommended R-value keeps heat in the living space, where it belongs. Thin insulation is a top cause.
Open soffit and ridge vents let cold air flush the underside of the roof. Missing baffles block this airflow.
Make sure insulation doesn't bury soffit vents, and that ridge vents aren't blocked.
At the eaves, this membrane is a backup that protects the deck if a dam does form.
Roof heat cables only mask the symptom and use a lot of electricity — they don't fix the cause.
It's tempting to climb up and chop at an ice dam, but you'll likely damage the shingles and could get hurt. A roof rake to pull snow off the lower few feet of roof is safer for managing an active dam, but the permanent solution is always in the attic: seal, insulate, ventilate. If your home gets ice dams every winter, an inspection of the attic and roof together will pinpoint exactly where the heat is escaping.
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Ice dams are part of a bigger winter-readiness picture. Browse the full Learning Center, explore our defect library, or see the complete 120-point home inspection. We serve Hutchinson and all of McLeod County.