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Prevent Ice Dams

I was told the following about preventing ice dams:If you have proper ventilation and insulation as well as proper installation of a roof (not just the shingles but all the other components you can't see) is the big stopper to ice dams. After all that it's best to just roof rake".
My question is who can determine if I have "proper installation of my roof"- a roofer?

A. Spruce
Re: Prevent Ice Dams
A. Spruce

Any good roofer or general contractor versed on the subject will be able to tell you what you have and whether it could or should be improved.

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