Emergency plumbing
Frozen pipe thawing and repair
A frozen pipe should be thawed slowly and checked for cracks before it carries pressure again. A plumber can thaw the line with controlled heat, find any split the ice caused and repair it. Keep the faucet open and know where your main shutoff is before the ice melts.
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Water lines freeze where they run through unheated space: crawl spaces, attics, garages, exterior walls and under mobile homes. The first sign is a faucet that gives a trickle or nothing on a very cold morning.
The risk is not the ice itself but what happens when it melts. A pipe that cracked while frozen starts leaking the moment water flows again, often inside a wall. That is why the plumber inspects the run after thawing rather than simply restoring flow.
Frozen Pipe Repair at a glance
- First sign
- A faucet that trickles or stops in freezing weather
- Main risk
- A split that leaks once the pipe thaws
- Where it happens
- Crawl spaces, attics, garages, exterior walls
- Prevention
- Insulation, heat cable, sealed air leaks
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What are the signs you need a plumber?
- One faucet has no flow while others work
- Frost on an exposed section of pipe
- A pipe that looks bulged or feels solid
- Gurgling or banging when you open a tap
- No water at all after a hard freeze
What does the plumber do?
- 1
Locate the freeze
The plumber traces which fixtures are affected to narrow down the frozen section.
- 2
Thaw with controlled heat
Heat is applied gradually from the faucet side back toward the ice so pressure can escape.
- 3
Inspect for splits
The run is checked as flow returns, and any cracked pipe or fitting is replaced.
- 4
Reduce the risk
The plumber points out where insulation, heat cable or rerouting would stop a repeat.
What affects the cost of frozen pipe repair?
It depends on the job, and a plumbing company can only give a firm price after seeing it. Prices also vary by region and by time of day. These are the factors that move a quote up or down. Ask for the price in writing before work begins.
- How easy the frozen section is to reach
- Whether the pipe split and how much needs replacing
- The number of frozen lines in the house
- After-hours demand during a regional cold snap
What can you do yourself, and when should you call a plumber?
Safe to try
- Open the affected faucet so melting water has a way out
- Open cabinet doors to let warm room air reach the pipes
- Warm an exposed pipe with a hair dryer, starting near the faucet
- Find your main shutoff before the pipe thaws
Call a plumber when
- Never use a propane torch, heat gun or open flame
- Don't leave a space heater running unattended in a crawl space
- Stop and close the main if you see a crack or any water
Frozen Pipe Repair questions
Will a frozen pipe thaw on its own?
It can, but waiting is a gamble. If the pipe cracked, it will leak as soon as it thaws, and you may not be home. Thawing it under watch, with the main valve located, limits the damage.
At what temperature do pipes freeze?
Water lines in unheated spaces are at risk when the outside temperature stays near or below 20°F for several hours. Pipes in exterior walls with poor insulation or wind exposure can freeze at higher temperatures.
How do I keep pipes from freezing again?
Insulate exposed runs, seal gaps that let cold air blow on the pipe, keep the heat on when away, and let vulnerable faucets drip during hard freezes. A plumber can also reroute a line out of an exterior wall.
How long does it take to thaw a frozen pipe?
An exposed pipe usually thaws in 30 to 60 minutes with gentle heat. A pipe inside a wall or under a floor can take several hours, because the heat has to reach it indirectly.
How do I find which pipe is frozen?
Open every faucet. The ones with little or no flow are fed by the frozen section. Then follow that line to where it passes through an unheated space or an exterior wall, and look for frost or a bulge on the pipe.
Do frozen pipes always burst?
No. Many frozen pipes thaw without damage. The risk rises with how long the pipe stays frozen and whether pressure is trapped between the ice and a closed faucet, which is why opening the tap helps.
Does PEX pipe freeze and burst?
PEX can freeze, but it expands more than copper or CPVC and is less likely to split. The brass or plastic fittings on a PEX system can still crack, so a frozen PEX line should be checked after it thaws.
Where we connect homeowners with plumbers
Frozen Pipe Repair requests are taken from across the United States. Local conditions change the work, so start with your city or find your state.
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Guides on this topic
How to prevent frozen pipes
Which pipes freeze first, what to do before a hard freeze and how to protect a house while you are away. Practical steps for cold and warm climates.
Read the guideWhat to do when a pipe bursts
A burst pipe can release gallons a minute. Follow these steps in order: shut off the water, drain the lines, protect the electrics and document the damage.
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