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Deep snow can be deep trouble for a roof. Once snow has collected on a roof it may begin to melt or rain may fall, both result in increased weight as ice and snow loads bear down. All of this weight can heighten the potential for the roof to collapse or for interior water damage to occur. These types of roof collapses were common in New England, the Midwest and the Pacific Northwest last winter. The Institute for Business & Home Safety (IBHS) engineers offer guidelines for helping to reduce the risk for roof collapse.