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I had the same problem before installing a new roof -- I stopped the flood by buying gutter heater wires and laying them on top of the ice dam and over the gutter. They melted through and allowed the water to have a channel to run off.
The first day that allowed me to install them in the gutter and on the roof properly ended my problem. The only real cure is to install ice shield under the shingles and that opion will not be available untill you replace the roof.
Rock salt will melt the ice, but the melted salt water will back up into the house.
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