I have them bad on one corner of my house. I have a south-facing house and and a roof with multiple peaks. The top of the roof gets sun all day, the water runs down to this corner which is shaded by one of the peaks. It freezes and I get Ice dams.
I have an outlet in the soffit of that corner so a heat cable may work for me if I can get the gutter clear to put it in it.
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