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Leak guide

Frozen pipes: prevent them, thaw them safely, and catch the leak

Frozen pipes catch people in two ways: homes in mild climates that rarely see a hard freeze, and the thaw afterward, when a pipe that split in the cold finally starts to leak.

Before a hard freeze

Pipes in attics, crawlspaces, garages, exterior walls and under sinks on outside walls are the ones that freeze. Homes in places where hard freezes are rare often have more of them, so a cold night that's routine up north can catch a house in Atlanta, Dallas or Charlotte.

  1. Let faucets on outside walls drip. A thin, steady trickle keeps water moving. On a single-handle faucet, set it to the middle so both hot and cold lines move.
  2. Open the cabinet doors under kitchen and bathroom sinks on outside walls so room heat reaches the pipes.
  3. Keep the heat on, even if you're away. Don't set the thermostat below about 55°F.
  4. Take care of outdoor faucets. Disconnect garden hoses. If the spigot has a shutoff valve inside the house, close it and open the outdoor tap to drain it.
  5. Close the garage door if there are water lines in the garage.
  6. Find your main water shutoff now, while nothing is leaking. It's usually where the water line enters the house: near the meter, in the garage, basement or crawlspace, or outside near a front hose bib.
  7. Leaving town? Keep the heat on, or shut off the main and drain the lines by opening the faucets. Ask someone to check the house if the cold lasts.

If a pipe is already frozen

Little or no water from a faucet on a cold morning, or frost on an exposed pipe, usually means a frozen section.

Watch the thaw

A pipe that split while frozen often doesn't leak until the ice melts, so the water can show up hours or a day after the cold breaks, sometimes while you're out.

Do you need a water damage company?

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Call promptly

A pipe split inside a wall, ceiling or attic, water ran before you found it, it reached drywall, insulation, carpet or a floor below, or areas are still damp after two days.

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Plumber, then reassess

A split you caught quickly in a crawlspace, garage or basement. Fix the pipe, dry with fans and a dehumidifier, and check that nearby walls stay dry.

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Plumber only, or no one

A pipe that froze and thawed without leaking. Check the line under pressure once it's thawed, and protect it before the next cold night.

Insurance

Water damage from a pipe that suddenly bursts is commonly treated as covered, while the pipe repair itself may not be. Frozen-pipe claims often depend on whether the heat was kept on, or the water was shut off and the lines drained in an empty home, so note what you did and when. Photograph the damage and the broken pipe, keep receipts, and call your insurer early. They make the coverage decision.

Not sure if a pipe split? Ask the advisor and describe what you're seeing.

Frequently asked

At what temperature do pipes freeze?

Pipes in unheated or outside-wall spaces are at risk whenever it stays below freezing for several hours, and the risk climbs quickly as temperatures drop toward about 20 degrees Fahrenheit. Wind and how well the pipe is protected matter as much as the number.

Should I let my faucets drip when it freezes?

Yes, for faucets on outside walls or fed by pipes in unheated spaces. A thin, steady trickle keeps water moving and relieves pressure if ice forms. On a single-handle faucet, set it to the middle so both the hot and cold lines move.

Why did my pipe start leaking after it warmed up?

Ice can split a pipe while it's frozen and also plug the split. When the ice melts, water starts flowing through the crack. That's why leaks often show up hours or a day after the cold breaks.

Does insurance cover frozen pipes?

Sudden water damage from a burst pipe is commonly covered, though the pipe repair may not be. Many policies expect that the heat was kept on, or the water was shut off and drained in an empty home. Your insurer decides.

Water spread into walls, ceilings or floors?

Talk to an independent water damage specialist. No obligation, and they can tell you if you need them at all.

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