http://go.askthebuilder.com/NewsletterSignupNow founder, Tim Carter shows how ice dams form and explains how to stop the damage they cause. He also shows a second roof on the same house with no ice dam explaining the mystery of no ice. Get FREE tips like this by subscribing to Tim's FREE newsletter now. Go to: http://go.askthebuilder.com/NewsletterSignupNow Discover more on ice dams at askthebuilder.com: http://www.askthebuilder.com/ice-dams-prevent-roof-leak/ http://www.askthebuilder.com/ice-dams-around-dormers/ http://www.askthebuilder.com/prevent-ice-dam-leaks-grace-ice-and-watershield/