The 2010 - 2011 winter has been very extreme for parts of the south and northeastern U.S., with many snowfall records being set. And as of early January, no relief in sight.Excessive snow or ice can be quite damaging to the roof of your house, and knowing how to remove them is critical to protecting your roof. Heavy snow can build up and become a major problem as the roof strains under excess weight it can have trouble handling.As the snow begins to melt, however, it can form ice dams which are...