How to Prevent Ice Dams on Your Michigan Roof
Those icicles look pretty, but they can be a sign of trouble. Here is how ice dams form on Michigan homes and how to keep them away for good.
What is an ice dam?
An ice dam is a ridge of ice that builds up along the edge of a roof. Snow higher up melts, runs down the roof and refreezes at the colder eaves. Over time the ridge traps a pool of water behind it, and that water can work its way under shingles and into the attic, ceilings and walls.
Warning signs to watch for
- Thick ice building along the gutters and roof edge
- Large icicles, especially with water dripping behind them
- Water stains or peeling paint on ceilings and exterior walls near the eaves
- Snow melting quickly on parts of the roof while the rest stays covered
- Frost or damp insulation in the attic
The real cause is a warm attic
Ice dams usually start inside the house. Warm air leaks into the attic through gaps around light fixtures, plumbing stacks, chimneys and the attic hatch, and heat passes through thin insulation. That warmth melts snow on the roof even on freezing days.
- Air sealing: close the gaps between the living space and the attic first.
- Insulation: add enough insulation to keep heat in the rooms below.
- Ventilation: balanced intake and exhaust vents keep the roof deck cold and help moisture escape.
If you already have an ice dam
Safety comes first. Climbing onto an icy roof or hacking at ice with a hammer or shovel is dangerous and can damage shingles.
- Use a long-handled roof rake from the ground to pull fresh snow off the lower part of the roof.
- Keep the area below clear of people, since ice and snow can fall without warning.
- For large dams or active leaks, call a qualified roofing professional who removes ice safely.
Roofing details that help
When it is time to repair or replace a roof, ask about an ice and water protection membrane along the eaves and valleys, proper drip edge, and gutters and downspouts sized and pitched to drain well. These details do not replace a cold, well-sealed attic, but they add an important layer of protection.
Plan ahead before the snow
Fall is the best time to fix the causes: clean the gutters, check the attic for gaps and damp insulation, and book repairs before the first heavy snow. Our roofing upgrade service can help you plan the right fix for your home.
This guide is general information, not professional advice for your specific home. Check local codes and work with licensed professionals. See our terms and conditions.
