'Tis the season for ice dams, Wisconsin. When icicles hang from the edge of your home's roof after snowfall, it's a sign this fickle, recurring winter concern might be plotting a leak into your home.

Icicles forming on gutters can be a sign of ice dams, a buildup of ice that can cause damage to roofs and gutters. Ice dams form when snow melts on a roof and refreezes at the edge, preventing water ...