During the winter months, homeowners have a few concerns they need to be aware of.  One of those very important concerns is ice dams and snow build-up.

Ice dams occur on the roof and can create a back-up of water on your roof that can lead to leaks.  An improperly vented attic melts the snow on the roof, which in turn melts and freezes near the gutters.  As the water melts and freezes, the back-up begins.  Removing the ice can be a challenge as the ice freezes around the shingles and can cause extensive damage.  Clearing your roof and working to prevent the problem during the warmer months is the ideal way to prevent ice dams.

There are many tactics home owners can use to ensure that ice dams do not negatively affect their homes.  Proper attic ventilation and maintenance of the roof are first and foremost.  Other products offers help in dealing the problem as well.  Heat tapes and special additions to the home clear the problem mid winter.  It is important to take care of the problems as they arise to prevent damage to the home or injury to people.

Source:  http://www.kimt.com/content/localnews/story/Preparing-for-Ice-Dams/6_GGxOhhk0yfluZq_hqSoA.cspx