Ice Dams: Why They Cause Leaks & How to Stop Them

Ice dams cause leaks when melting snow refreezes at the eaves and pushes water under shingles. In Lehi this happens most often on homes in North Lehi, South Lehi, and The Preserve where attics lose heat and winters stay below freezing for days. The fix starts with stopping heat loss and clearing dams before water backs up.

How Ice Dams Form in Lehi Winters

Lehi sits in a semi-arid climate with hot summers and cold winters that drop well below freezing. Snow falls on roofs in neighborhoods like Dry Creek and Jordan Willows, then melts from attic heat that escapes through poor insulation or recessed lights. The water runs down to the cold eaves and freezes into a dam that blocks further drainage. Once the dam grows, any additional melt has nowhere to go except under the shingles. Homes near Lehi City Hall and the Lehi Main Street District often show this pattern because many were built before modern insulation standards. The same process repeats in nearby American Fork and Draper when temperatures swing from daytime thaw to overnight freeze.

Why Ice Dams Lead to Roof Leaks

Water trapped behind an ice dam finds every gap in the roof covering. It seeps past shingle edges, works under flashing, and soaks into underlayment. In Lehi this commonly shows up as ceiling stains in upstairs bedrooms or wet insulation above garages. The pressure from the standing water can also lift shingles enough for more water to enter during the next thaw. Over repeated cycles the damage reaches sheathing and can spread to walls. Local roofers see the worst leaks on south-facing slopes that collect the most sun during the day then freeze solid at night.

Practical Steps to Stop Ice Dams Before They Start

Begin by improving attic ventilation and insulation so the roof deck stays close to outdoor temperature. Seal gaps around pipes, wires, and light fixtures that allow warm air to reach the underside of the roof. Keep gutters and downspouts clear so meltwater has a path off the roof. In Lehi's cold winters, adding roof-edge heat cables on problem sections helps on older homes in Thanksgiving Point and the Lehi Cemetery area. Check flashing around chimneys and skylights each fall because these are common entry points once a dam forms. Homeowners in Eagle Mountain and Saratoga Springs report fewer issues after adding ridge vents and baffles that keep airflow moving.

When Professional Ice Dam Removal Helps

When a dam has already formed and water is entering the home, safe removal requires specialized tools that avoid shingle damage. Ice Dam Removal & Prevention crews use steam or hot water to melt the ice from the top down without hammering. This approach protects the roof surface that would otherwise crack under mechanical force. After removal, the same team can inspect for hidden leaks and recommend targeted fixes. Pair this with the Lehi Seasonal Roof Maintenance Checklist (Spring/Fall) to catch insulation gaps before the next winter. For cost ranges on related leak repairs see the Roof Leak Repair Cost in Lehi (2026 Price Guide).