Ice dams can cause damage to your roof, and they can also harbour potentially dangerous icicles. One of the causes of ice dams is heat loss from your home -- the middle of your roof heats up, causing snow on the roof to melt and travel toward the eaves. Then, the comparative coldness of the eaves causes the melted snow to freeze and create an ice dam. There are numerous things you can do to your roof to eliminate ice dams, but you also have to address heat loss from your house.