Quick answer
Pipes freeze when water inside them drops below 32°F and expands — most often in unheated areas like crawlspaces, garages, exterior walls, and along uninsulated runs. A burst frozen pipe can flood a home fast. Prevention is mostly insulation, keeping heat reaching vulnerable pipes, and letting faucets drip during extreme cold.
- At-risk pipes run through crawlspaces, garages, exterior walls, and attics.
- During hard freezes, let a vulnerable faucet drip and open cabinet doors for warmth.
- Insulate exposed pipes and disconnect outdoor hoses before winter.
- A pipe that's frozen but not yet burst can often be saved with gentle, even thawing.
When to take action
Before and during any Tri-State cold snap, especially overnight lows in the teens or single digits, and any time you'll be away from home in winter. Older homes, additions, and pipes on exterior walls are the usual trouble spots.
Why it matters
Water expands as it freezes, and that pressure can split a pipe. The damage often isn't obvious until it thaws and floods. A few inexpensive precautions prevent a costly water-damage cleanup.
How it works
Prevention steps
Insulate exposed pipes with foam sleeves, seal drafts near pipe runs, disconnect and drain outdoor hoses and shut off their supply, keep the home heated even when away (no lower than the mid-50s), open cabinet doors under sinks on exterior walls, and let a faucet drip during extreme cold so water keeps moving.
If a pipe freezes
If no water comes out of a faucet on a cold morning, that line may be frozen. Keep the faucet open, and warm the pipe gently with a hair dryer or towels soaked in warm water — working from the faucet toward the cold spot. Never use an open flame. If you can't reach it or a pipe has burst, shut off the water and call.
Key terms and context
This guide is written for plumbing decisions in the Tri-State. It uses the same terminology you'll hear from inspectors, technicians, and permit offices.
What not to do
Don't use a blowtorch or open flame to thaw a pipe — it's a fire and burn risk and can damage the pipe. Don't ignore a faucet that won't flow in freezing weather. And don't fully shut off the heat in an empty home during winter; keep it warm enough to protect the plumbing.
Why you can trust this
- Reviewed against Comfort Central's licensed-plumbing standards and field service records.
- Emergency help available when a pipe bursts.
How we build this guidance
- Straight answers first, so you know your options without the fluff.
- Written and reviewed by techs who do this work every day.
- Specific to Tri-State homes, weather, and water.
- Updated 2026-06-01 from real plumbing jobs around the region.
Methodology: Written and reviewed by Comfort Central's licensed plumbing team from real service calls across Hagerstown and the Tri-State. Guidance reflects code requirements and field experience — not a sales pitch.
Last updated: 2026-06-01
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Common questions
Should I really let my faucet drip in a cold snap?
Yes, for pipes at risk. A slow drip keeps water moving and relieves pressure, which makes a freeze-and-burst far less likely. The small water use is cheap insurance against a flooded home.
What should I do if a pipe bursts?
Shut off the main water supply immediately to stop the flooding, then call for emergency service. Knowing where your main shutoff is — before winter — saves critical minutes.