Roof Doctor just left here. He just said insulation is great, but still evidence of moisture (a few days after water stopped coming through light fixture and door jam). Shingles are fine, but the north/northeast facing valley directly above my front door where it was leaking could be the problem: that spot gets zero sunlight, and snow just sits there, it's always the last thing to melt
He's emailing me a list of suggestions, but one that caught my ear when we were talking was de-icing cables in that spot. Do those work? I think every opinion I've heard is they're a total waste of money.
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