A roof full of snow can lead to ice damming. Many factors lead to ice damming and one of the major cause is lack of insulation and ventilation. You ask how does venting effect snow on the roof? The air in the attic does not flow through the attic area effectively, heating the roof sheathing and the snow above it melts to quickly. This hits the gutter system and then builds ice dams. Some peop.....
... read the rest of this article at the source: How To Control Ice Damming
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