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Before the Snow Flies: An Ice Dam and Gutter Checklist for Waterloo Homes

Ice dams are one of the most common winter roof problems in the Cedar Valley. A few hours of fall prep can keep meltwater from backing up under your shingles in January.

Why ice dams form here

Heat from the house warms the upper roof and melts snow. The water runs down to the cold eaves and refreezes, building a ridge of ice. More meltwater pools behind it and works its way under the shingles. Waterloo's long stretches of below-freezing weather, broken by sunny thaws, make this cycle common.

The fall checklist

• Clean gutters and downspouts after most leaves drop. Clogged gutters freeze solid and give ice dams a head start.
• Point downspouts away from the foundation and walkways so spring melt does not refreeze on steps.
• Look up from the yard for missing or lifted shingles, loose ridge caps, and cracked boots around plumbing vents.
• Check the attic on a cool day. Look for thin or uneven insulation, damp spots, rusty nail tips, or frost on the underside of the deck.
• Seal air leaks around attic hatches, recessed lights and bath fans so warm air stays in the living space.
• Make sure vents are open: soffit vents blocked by insulation and a missing ridge vent are a classic ice dam recipe.
• Trim branches that hang over the roof before ice and snow load them up.

If an ice dam forms

Do not chip at the ice with a hammer or shovel; it is easy to tear shingles. A roof rake used from the ground to pull snow off the bottom few feet helps. For a dam that is already leaking, a pro can steam it off safely. Then plan a fix for the root cause, usually insulation, air sealing, or ventilation, plus ice-and-water shield at the eaves on your next reroof.

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• When to Schedule a Roof Replacement in Waterloo, Iowa