Our homes are our defense against the elements.  Every season has its share of weather that our home guards against.  However, none is more damaging then ice dams in the wintertime.  For those of us that live in regions where heavy snowfall during the winter is likely, it is good to know about what you can do to preserve the integrity of your roof and prevent it from being damaged.

Ice dams generally form at the edge of the roof, where melted water is prevented from running off.  They are caused by a poorly ventilated attic and warm air that rises through the home.  This air, in turn, melts the bottom layer of snow.  The run-off has nowhere to go and ends up damming up near the gutters.  Water’s instinct is to go down, so it will freeze around the shingles and eventually leak into the home.  The best ways to prevent them is to ensure that your roof is in tiptop condition before the first snowfall.  In addition, proper maintenance of your gutters is crucial.  Clean them out, removing any clogs or debris.  Check your attic, seal any leaks, and repair any insulation that requires it.  These are the best ways to prevent ice dams.

Source:  http://www.artipot.com/articles/506304/ice-dams-cause-care-and-prevention-of-roof-ice-dams.htm