Preventing Ice Dams and Handling Roof Snow

What causes ice dams

Heat escaping into the attic warms the roof deck. Snow melts and runs down to the cold overhang, where it refreezes into a ridge of ice. Water trapped behind the ice can work under shingles and into walls and ceilings.

Short-term steps

During a snowy stretch, these steps reduce the risk of a leak:

• Use a long-handled roof rake from the ground to clear the bottom few feet of snow.
• Keep gutters and downspouts clear before winter.
• Never chip ice with an axe or hammer. It damages roofing.
• For a heavy load or an active leak, call a professional instead of climbing.

Lasting fixes

University extension services and energy programs point to the same solution: seal air leaks into the attic, add insulation, and make sure the roof is properly ventilated. A home energy audit can find hidden leaks around chimneys, lights and attic hatches. Ice-and-water barrier along the eaves adds protection when you replace your roof.

After a leak

Dry wet insulation and drywall quickly. If a stain keeps spreading or smells musty, a restoration company can check for hidden moisture.

Finding local help

Below are roofers, energy-efficiency contractors and restoration companies that serve the Upper Valley.