Ice Dams Keep Coming Back? How to Fix the Cause Before Winter

If ice builds up along the same section of your roof every winter, clearing it once may not solve the problem. In Gunnison and Crested Butte, repeated freeze-thaw cycles can turn a small drainage issue into a recurring leak.

The right fix depends on where the water is coming from, where it freezes, and what is happening beneath the roofing system.

Why does the same ice dam return each winter?

Ice dams often form when melting snow reaches a colder roof edge and refreezes. Warm air leaking into an attic, uneven insulation, blocked drainage, roof valleys, and complicated roof transitions can all contribute.

If ice keeps appearing in one location, the goal is to identify the cause rather than treat the ice alone.

What should a roof inspection check?

• Roof edges, flashing, valleys, and penetrations where water may enter
• Gutters and downspouts for debris or frozen drainage paths
• Existing heat cable and whether meltwater has somewhere to go
• Attic air leakage, insulation, and ventilation concerns that may require an appropriate specialist
  

Will heat cable solve an ice dam problem?

Heat cable can help keep a drainage path open in selected areas, including valleys, eaves, gutters, and downspouts. It does not replace good roof design, insulation, air sealing, or maintenance. Adding heat without a route for water to drain can move the ice to another location.

Learn more about AMC's gutters, snow retention, and heat cable options.

Repair the problem before the next freeze

A small flashing repair or drainage correction may be enough when the roof is otherwise sound. Recurring leaks, deteriorated roof materials, or widespread damage call for a broader assessment. You do not necessarily need a new roof because you have an ice dam.

For the basics on how ice dams form, see AMC's existing Colorado ice dam guide.

The U.S. Department of Energy also explains the role of air sealing, insulation, and ventilation in reducing ice dam risk.

Frequently Asked Questions