The answer to 'flashing ice dams' is that flashing is a common cause of ice dams forming on roofs. Flashing is the thin metal sheeting used to seal joints and gaps in the roof, like around chimneys, vents, and edges. If the flashing is installed improperly or becomes damaged over time, it can create gaps that allow warm air to escape the home and melt snow on the roof. As the melted snow refreezes at the roof's edge, it forms an ice dam that can back up water and cause leaks.
To fix flashing-related ice dams, the flashing should be inspected and repaired or replaced if necessary. This is best done by a professional roofer, as improper flashing installation or repair can lead to further issues. Homeowners can also take preventative measures like insulating the attic, sealing air leaks, and installing heat cables to melt ice dams before they form.