Roof Ice Dams: Causes, Risks & Prevention Basics

Ice dams can develop when melting snow reaches a colder roof edge and refreezes, potentially allowing water to back up beneath roofing materials. Insulation, air leakage, ventilation, snow and weather conditions can all play a role.

What you can check safely

From the ground or inside the building, note when the problem started, whether it changes during rain or wind, and whether you can see missing material, staining or dampness. Avoid walking on a roof to investigate a problem.

What the symptom does — and does not — tell you

A symptom can narrow the conversation, but it does not prove the exact source or required scope. Roofing assemblies have overlapping materials and water can move before it becomes visible.

Next step

For a localized issue, see roof repair in New Britain. For recurring or widespread problems, compare repair and replacement.