Alternatively you can fill paper bags with calcium chloride and toss them up on to the roof just above the ice dam.
How to clear ice dams on roof.
This blast of cold air will usually be enough to refreeze the fingers of the ice dam while the snow and ice is melting away on the outside of your home.
Eliminate its fuel source if left alone the ice dam will continue to be built up by the snow and ice up on your roof.
It will put gutters and downspouts at risk too.
If necessary use a long handled garden rake or hoe to push it into position.
Over time the calcium chloride will clear a channel in the ice dam allowing the water on your roof to escape.
Use a roof rake after heavy snowfalls.
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The calcium chloride will eventually melt through the snow and ice and create a channel for water to flow down into the gutters or off the roof.
If your home is beginning to suffer the leaks indicative of an ice dam take a fan a box fan or small air mover into your attic and direct it at the section of roof suffering the leak.
Ice dams appear quickly after a heavy snow because of the insulating properties of snow.
Ice dams are a common sight in northern new england winters and home partners has dealt with quite a few.
An ice dam can damage both your roof and the inside of your home.
Ask this old house general contractor tom silva explains the best ways to keep your roof and gutters free from those dreaded ice dams.
Lay the hose onto the roof so it crosses the ice dam and overhangs the gutter.
Using a long handled roof rake to removing the snow from at least at lower 4 feet of roof edge can help prevent ice dams from forming.
One way to remove an ice dam is to melt it using calcium chloride ice melt.
So the first step is to remove this ice and snow using a snow rake which is a retractable rake that can extend up to about 17 feet or so in length.
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Never use rock salt for this as it will do more damage to your roof than it will to the ice.