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Title: Damaging
Review: I have ice dams and currently have a team of insulation installer guys mucking around in my attic. I showed them the ice melt I got for a part of the house not accessible from the attic (this stuff, calcium chloride based) and they told me to take it back. Calcium chloride is damaging to asphalt shingles. They suggested getting ice melt made of magnesium or potassium instead, which is what I'm doing.
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