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Frozen Pipes? How to Thaw Safely — and Prevent a Burst
A frozen pipe is a burst pipe waiting to happen. Thaw it right and you avoid a flood; thaw it wrong — or too late — and you don't.
If a pipe has already burst
Do not wait — water is the enemy now:
- Shut off your main water valve immediately (usually where the water line enters the basement).
- Open a faucet to drain the remaining pressure.
- Move valuables away from the water and call us.
- Never thaw a pipe with a torch or open flame — it bursts pipes and starts fires.
What Happens When a Pipe Freezes
When a pipe freezes, the water inside expands and puts enormous pressure on the pipe — and that pressure is what bursts it, often not at the ice but downstream of it. On the South Shore, the usual victims are pipes in exterior walls, crawl spaces, garages, and unheated basements.
If you have no water at a faucet on a cold day, suspect a freeze. The goal is to thaw it gently before it bursts — and to recognize the warning signs that it's time to shut off the main and call. Never use an open flame to thaw a pipe.
How to Thaw It Safely
1. Open the faucet first
Open the faucet the frozen pipe feeds. Running water — even a trickle — helps melt the ice and relieves the pressure as it thaws.
2. Apply gentle heat
Use a hair dryer, heat lamp, or towels soaked in hot water, working from the faucet end toward the freeze. Never a torch or open flame.
3. Know the burst signs
A bulged or frost-covered pipe, or a wall that suddenly turns wet, means shut off the main now and call. Stopping the water beats chasing the thaw.
4. Prevent the next one
Insulate vulnerable pipes, seal drafts, keep cabinet doors open on cold nights, and let a faucet drip in a deep freeze. We can pinpoint and protect the at-risk runs.
Common Questions
Why South Shore homeowners choose Johnson Bros.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Need help fast? Call for urgent plumbing issues. Booking online is best when you want the next open appointment without waiting on the phone.
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Massachusetts-licensed plumbing support backed by insured crews.
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We tell you what timing is available and keep you updated if the schedule shifts.
Upfront Options
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Repair-First Guidance
We help you understand whether repair, replacement, or follow-up service makes the most sense.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Call for urgent help now. Book online when you want the next available fit for your schedule.