![](http://www.alamy.com/thumbs/6/45310712-AB60-454E-A51C-FB8A38EAD018/2F4N1JM.jpg)
If you see icicles hanging from the edge of a roof, it may be a sign of an ice dam. An ice dam is a ridge of ice that forms along the edge of a roof.
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Photo credit: © Manfred Glueck / Alamy / Afripics
License: Licensed
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