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How Do You Prevent Pipes From Freezing in Cold Weather?

Last updated October 23, 2026

The short answer

Insulate Exposed Water Pipes

Pipe insulation sleeves or foam are your first defense against freezing. They fit around pipes in unheated areas like attics, crawl spaces, and garages. Focus on pipes near exterior walls or in cabinets. Insulation does not ensure complete protection, but it significantly slows heat loss from the water inside the pipes.

For extra protection on very vulnerable pipes, consider using heat tape or cable. These electric heating elements wrap around the pipe and provide direct warmth. Follow the manufacturer's instructions precisely to avoid a fire hazard. This is often a good choice for short sections of pipe in extremely cold spots.

Maintain Interior Heat and Airflow

Keep your thermostat set to at least 55F, even when you are away or asleep. This provides enough ambient warmth to help pipes inside walls. If you plan to be gone for an extended period, do not turn the heat off completely. Ask a neighbor to check that your heat is working during a cold snap.

Open cabinet doors under sinks, especially on exterior walls, to allow warm room air to circulate around the pipes. This simple step can make a big difference. Also, seal any cracks or holes in your home's exterior where cold air can blow directly on pipes. Use caulk or spray foam insulation for these gaps.

Use Faucets and Drain Outdoor Lines

Letting a faucet drip slightly relieves pressure inside the pipes, which can prevent a rupture if ice forms. A slow, steady drip from the faucet farthest from your water main is often recommended. Both hot and cold water lines should drip, as both can freeze. This is a temporary measure for nights when temperatures plummet well below freezing.

Disconnect and drain garden hoses, and shut off the water supply to outdoor spigots. Use an indoor shutoff valve for each outdoor faucet, then open the outdoor spigot to drain any remaining water. Install outdoor faucets designed to resist freezing if possible. For irrigation systems, have them professionally blown out with compressed air to clear all water from the lines.

  • Disconnect all garden hoses from outdoor spigots.
  • Locate and close the indoor shutoff valve for each outdoor faucet.
  • Open the outdoor faucet after closing the indoor valve to drain the remaining water from the pipe.
  • Consider installing insulated covers on outdoor faucets.
  • For sprinkler systems, schedule a professional blow-out service.
  • Keep your main water shutoff valve location accessible and known to all household members. In cold weather, opening cabinet doors under sinks on exterior walls allows warm air to circulate around the pipes.

What to Do If a Pipe Freezes

If a faucet only produces a trickle or no water, a pipe may be frozen. Immediately turn on the faucet. Then, gently apply heat to the frozen section using a hair dryer, heating pad, or towels soaked in warm water. Never use an open flame, as it is a fire risk and can damage the pipe.

Work from the faucet toward the frozen area. If you cannot locate the freeze, if the pipe has burst, or if you are unsure, turn off the main water supply and call a plumber. Trying to thaw a pipe that has already split can lead to a major leak when the ice melts.

Addressing Water Damage from Burst Pipes

A burst pipe can release hundreds of gallons of water quickly. Your first step is to shut off the main water valve to stop the flow. Then, move valuables and furniture out of the water if it is safe to do so. Water damage can soak drywall, ruin flooring, and lead to mold growth within days.

Contact local water damage pros for water extraction and drying. They have industrial equipment to remove water and dry the structure properly. Moisture left in walls or under flooring will cause further damage. Mold can begin to grow in as little as 24 to 48 hours in damp conditions.

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Frequently asked questions

At what temperature do pipes typically freeze?

Pipes are at risk of freezing when outdoor temperatures stay at or below 20F. However, uninsulated pipes in unheated interior spaces can freeze when indoor temperatures drop near freezing. Wind chill and pipe location affect the risk. Exposed pipes in an attic or crawl space are often the first to freeze.

Should I drip hot or cold water to prevent freezing?

Let both the hot and cold water lines drip slightly. A small, steady stream from each is most effective. This keeps water moving through the entire system, making it harder for ice to form. Focus on the faucet that is farthest from where the main water line enters your home.

What if a frozen pipe bursts and floods my home?

Immediately shut off your home's main water supply. Then, contact local water damage pros for emergency water extraction and drying. Quickly removing water helps prevent structural damage and mold. Take photos for your insurance claim, but know that policies vary, and your insurer decides what is covered.

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