Watch on YouTube: http://www.youtube.com/watch?v=yNHZNzVhWmg
ICE dams are not always natural occurrences caused by freezing weather. Ice dams are the cause of interior heat loss known as thermal or air bypass to attic spaces that permit micro-melts or uneven snow melts that freeze at the cold gutter, soffit, or overhang locations. Basement negative pressure and upper floor thermal bypass corrections usually minimize the ice dam phenomenon. Ice guard, gutter melting cords, and gutter caps contraptions are only bandages.