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When the snow starts to stack up and the temperature swings between freeze and thaw, roofs begin telling on a house. Icicles that look postcard pretty can signal a problem upstream: water trapped behind an ice ridge, creeping under shingles, soaking roof sheathing, and eventually staining ceilings or swelling window trim. After twenty winters of climbing ladders, clearing soffits, and coaching homeowners through anxious calls, I’ve seen how quickly a minor ice ridge can tur