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Cold Weather Plumbing Tips to Prevent Burst Pipes

Last updated October 25, 2026

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The short answer

Why Pipes Burst in Cold Weather

When water freezes inside a pipe, it expands and creates pressure that can crack the pipe wall. The damage often shows only after the ice thaws and water flows out. Even a small crack can release gallons of water per minute, causing significant damage to floors, walls, and belongings.

Freezing nights are less frequent in mild marine climates, but they still happen. A hard freeze can catch you off guard. Taking simple precautions before a cold snap is far easier than dealing with a flooded home afterward.

Insulate and Seal Drafts

Insulate exposed pipes in unheated areas like attics, basements, garages, and crawl spaces. Use foam pipe insulation or heat tape designed for pipes. Pay special attention to pipes near exterior walls, as they are most vulnerable to cold air.

Seal any gaps or cracks around windows, doors, and where pipes enter your home. Cold drafts can lower the temperature around pipes quickly. Check for gaps around vents and foundation openings. A few tubes of caulk or spray foam can make a big difference.

  • Wrap pipes with foam insulation sleeves
  • Seal cracks around exterior walls and windows
  • Close garage doors to keep pipes warm
  • Open cabinet doors under sinks to let warm air circulate
  • Keep a slow drip from faucets during freezing nights

Keep Water Moving and Warm

On freezing nights, let a small trickle of water run from faucets, especially those on exterior walls. Moving water is less likely to freeze. This also relieves pressure in the system if ice does begin to form.

Keep your thermostat set to the same temperature day and night. Lowering it at night saves energy but can let pipes get cold enough to freeze. If you leave home for several days, set the thermostat to at least 55 degrees and ask someone to check on your home.

Know Your Shutoff Valve and Drain Systems

Locate your main water shutoff valve before an emergency. If a pipe bursts, shutting off the water quickly limits damage. Write down the location and keep it visible. If you live in Kirkland, keep that note near your water heater or on the inside of your front door.

Drain outdoor hoses and irrigation systems before winter. Shut off the outdoor water supply and open the faucet to let remaining water escape. Store hoses indoors. For sprinkler systems, follow the manufacturer's instructions to blow out any residual water.

What to Do If a Pipe Bursts

If you discover a burst pipe, immediately shut off the main water valve. Then open all faucets to drain the remaining water. Turn off the electricity in the affected area if there is any risk of water reaching outlets or appliances. Avoid touching standing water if you suspect electrical hazards.

After the water is off, call local water damage pros to extract water and dry the area. They have the equipment to remove water quickly and prevent mold growth. If you have insurance, contact your insurance company to discuss coverage. Policies vary, and your insurer decides what is covered.

  • Shut off the main water valve first
  • Drain faucets to relieve pressure
  • Turn off power in flooded areas if safe
  • Move valuables out of the affected area
  • Call the pros for extraction and drying

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Frequently asked questions

What temperature should I keep my home to prevent burst pipes?

Keep your thermostat at 55 degrees or higher, even when away. This maintains enough warmth to prevent most pipes from freezing. If you are home, keep it at your normal temperature, especially at night.

Should I let all faucets drip during a freeze?

Let the faucets farthest from your main water line drip, plus any on exterior walls. A slow trickle is enough. Moving water keeps ice from forming. You do not need to run a full stream, just a steady drip.

What if my pipes freeze but have not burst yet?

Shut off the main water valve and open faucets to relieve pressure. Use a hair dryer or space heater to warm the pipe slowly. Never use an open flame. If the pipe has cracked, you may not know until it thaws, so call a plumber to inspect.

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