The failures cluster in the same places: lines in exterior walls, crawl spaces, garages, and against rim joists. Insulate those runs, seal the drafts that pour cold air over them, keep cabinet doors open on the coldest nights so room heat reaches wall lines, and let a vulnerable faucet drip slowly when a hard freeze is forecast; moving water resists freezing and relieves pressure if ice does form. Know your shutoff before the cold snap, and disconnect and drain exterior hoses in the fall. A line that froze once will freeze again until its exposure is fixed.
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