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Lake-Effect Ice Dams: Prevention and Remediation

How do you prevent and fix lake-effect ice dams?

In the older James Street homes around Syracuse, the icicles hanging off the eaves every February are not charming, they are a warning. A lake effect ice dam forms when heat escaping into the attic melts the snowpack, the meltwater runs to the cold eave, and it refreezes into a ridge of ice that backs water up under the shingles and into the house. Chipping the ice off the gutters treats the symptom. Stopping the dam means fixing why the roof is warm in the first place.
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The Dam Starts in the Attic

A uniformly cold roof deck does not form ice dams. The culprits are warm air leaking into the attic and weak insulation that lets heat bake the underside of the deck. We air-seal the ceiling plane, top up insulation to a real R-value, and confirm the airflow with proper attic ventilation balancing so the deck stays the same temperature from ridge to eave. On a century-old James Street home, that air-sealing is usually the single highest-impact fix.

Defense at the Eave

Even a well-managed roof gets edge ice in a brutal CNY winter, so the roofing assembly itself needs a defense. A wide ice and water shield membrane run well past the interior wall line gives a waterproof backstop at the eaves and valleys where dams form. We install it whenever we touch the roof, because it is cheap during a roof replacement and impossible to retrofit without tearing the field off later.

Homeowners want me to heat-cable the gutters and call it solved. Cables manage the symptom and run up the power bill all winter. Seal the attic and balance the ventilation and the dam never forms. Fix the cause, not the icicle.

– Travis O’Connell Byrne, Exterior and Roofing Specialist

When Damage Is Already Done

If a dam has already pushed water inside, remediation means finding every wet path before mold sets in, and checking where ice loaded the structure, which ties into snow load roof engineering on older low-pitch sections. We also inspect the chimney repair flashing, since the chimney is a common entry point for ice-dam water on these older homes.

Stopping Ice Dams in Syracuse?

SAP Construction has been solving lake-effect ice dams across the James Street area and greater Syracuse since 2017. Schedule a consultation and your project manager will inspect the attic and the roof edge, then deliver a transparent estimate within 24 hours.

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Our experts are here to help. Contact us directly for a consultation or any specific questions about your project.

Heat escaping into the attic melts the snowpack, and the meltwater refreezes at the cold eave and backs up under the shingles.
They manage the symptom and raise the power bill; air-sealing and balanced ventilation fix the cause.
A wide ice-and-water shield run well past the interior wall line.

STILL HAVE QUESTIONS?

Our experts are here to help. Contact us directly for a consultation or any specific questions about your project.

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