Ice dams are large accumulations of ice that form between the lower edge of your roof and the gutter. They occur when ice and snow melt and then refreeze at the edges of the roof where surface temperatures are colder. Ice dams prevent melted water from flowing into the gutters and off the roof. They can also allow water to build up behind them, which can lead to overflows and leaks that damage roofs and interior walls, as well as the inside of your building.  (more…)