12/05/2025
An ice dam is a buildup of ice that forms at the edge of a sloped roof, preventing melting snow from draining properly. The provided diagram illustrates its formation and components:
*Heat from inside the home escapes into the attic, warming the roof deck.
*This heat melts the snow on the roof, creating water that flows down toward the eaves.
*The water then reaches the colder roof edge (soffit/facia area) where the heat cannot reach, causing it to refreeze into a ridge of ice.
*As more snow melts, the water pools behind the ice dam and can back up under the roof shingles and underlayment, potentially leaking into the home's walls and ceiling.
How To Prevent Ice Dams
Getting rid of ice dams for good involves insulating common problem areas in your attic and roof to prevent future buildup of snow and ice. Effective ice dam prevention will help save energy costs and make your home easier to heat and cool year round:
Ventilate your attic - Your attic should be well ventilated so heat doesn’t accumulate in that space. Ridge vents used with continuous soffit vents are an effective ventilation strategy.
Seal all interior inflow attic leaks - The area between the attic and living spaces below should be insulated enough to stop heat from rising into the attic. Similarly, air leaks between the living spaces and attic should be well sealed. The same goes for the attic hatch or door.
Clean your gutters before winter - Clear leaves and debris from your gutters before winter begins to allow for proper drainage of melted water from snow.
Add attic insulation - Stop the transfer of heat through the roof by keeping your attic and ductwork well insulated. Quality attic insulation will prevent ice dams and help retain heat inside your home to keep energy costs low during the winter.
Rake your roof after snowfall - Prevent ice buildup by raking your roof immediately after a snowfall while the snow is still soft. This can be done with the use of a roof rake to safely clear snow without the use of a ladder.
Exhaust to the outside - Make sure there aren’t any exhaust vents that open into the attic. Ducts that connect kitchen, bathroom, and dryer vents should lead outdoors through the roof or walls, but never through the soffit.
How To Get Rid Of Ice Dams
The process to remove ice dams involves applying a melting agent of calcium chloride and then carefully breaking the ice into chunks with a mallet. Breaking an ice dam can be dangerous and extreme caution should be used, so we recommend calling a professional to remove them. The person breaking the ice dam should do so from the roof, as they can result in large chunks of ice crashing off the roof and potentially damaging windows, bushes or injuring anyone below