If you’ve never seen an ice dam, it actually looks a lot like you would expect. It is an accumulation of ice on along the eave line of a sloped roof. The ice can build and build over the winter months until it is a solid wall that can be ice-damfeet thick and can span the entire eave line of a roof. The reason ice dams are so detrimental is because, as temperatures rise they can trap the melting snow on the roof behind them creating a little pond of standing water. A sloped asphalt roof is designed to shed water moving in only one direction, down and off of the roof. The second water becomes static and starts to accumulate it can easily defeat even high quality, correctly installed roof components and can cause leaks in the home.    Read the article…………..