Icicles may be pretty, but they are usually one of the first warning signs of ice damming on your roof.
Conditions that allow icicles to form also cause ice damming- which can cause serious damage to both your roof and the inside of your home, and it only takes one or two back-to-back storms for the it to start.
How much damage can ice dams cause?
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Dams can tear off gutters.
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Ice can work its way back up the roof edge and get under shingles.
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As it melts, it can soak the roof sheathing and leak into the attic (unless there is a barrier.)
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Sealing the roof deck is an effective way to prevent the water from entering your home and causing damage.
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According to the Insurance Institute for Business & Home Safety- Installing a new roof is the best time to seal the roof deck by installing a moisture barrier on top of the decking, before installing the roof covering. This will help keep water out of your home due to moisture from ice dams, as well as protecting the house from wind-driven rain if the roof cover blows off during a storm.