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Ice at the edge of your roof means there's a problem with the insulation. You don't want ice dams there - water backs up into your attic, and they're dangerous for anyone walking under the eaves.
In heavy snow areas we either pitch the roof steeply or shovel it regularly; sometimes both.
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The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi 
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