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What Parts of a Home Are Most at Risk for Frozen Pipes?

Last updated October 31, 2026

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The short answer

Unheated Spaces

Pipes in attics, crawl spaces, and garages have little or no heat, so they freeze first. Even if the rest of your home stays warm, these areas can drop below freezing on cold nights. Check any plumbing that runs through these zones, especially near vents or gaps where cold air enters.

Basements and utility rooms can also get cold, particularly if they are unfinished or have exposed pipes. Insulating these pipes and sealing drafts around doors and windows helps. If you live in Columbus, keep your shutoff valve location written down in case a pipe bursts.

  • Attic pipes
  • Crawl space pipes
  • Garage pipes
  • Unfinished basement pipes
  • Utility room lines

Exterior Walls

Pipes that run inside exterior walls are vulnerable because the cold outside can penetrate the insulation. This is common in older homes where plumbing was added later. Cold air can also leak through electrical outlets or gaps around pipes, chilling the wall cavity.

To reduce risk, open cabinet doors under sinks on exterior walls during freezing weather. This lets warm room air reach the pipes. You can also add foam pipe insulation, but it only helps if the wall cavity itself stays above freezing.

  • Kitchen sink pipes
  • Bathroom vanity pipes
  • Laundry room lines
  • Pipes near drafty outlets

Outdoor Fixtures

Outdoor hose bibs and sprinkler lines are directly exposed to freezing air. A hose left attached can trap water and cause the pipe to freeze back into the wall. Disconnect hoses and shut off the outdoor supply before winter.

Irrigation systems and pool lines also need attention. Drain them completely or blow out the water. If you cannot drain them, keep a slow trickle running during extreme cold, but only if you know the drain is clear.

Crawl Spaces and Vents

Crawl spaces under your home can get very cold, especially if vents are open. Pipes running through these areas are at high risk. Close crawl space vents in winter, but make sure you do not trap moisture that can lead to mold.

Check for gaps around pipes entering the crawl space and seal them with caulk or foam. This keeps cold air out and helps the space stay closer to indoor temperatures. If you have a sump pump or water heater there, insulate those lines too.

What to Do If a Pipe Freezes

If you suspect a frozen pipe, turn off the water at the main shutoff valve. Open a faucet near the frozen section to relieve pressure. Never use an open flame to thaw a pipe; use a hair dryer or space heater, keeping it away from flammable materials.

If a pipe has already burst, shut off the water and call local water damage pros. They can extract water, dry out the structure, and help with repairs. Acting quickly reduces damage to drywall, flooring, and insulation.

  • Shut off the main valve
  • Open a nearby faucet
  • Use gentle heat to thaw
  • Call the pros if a pipe bursts

Talk to someone now

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

At what temperature do pipes freeze?

Pipes can freeze when outdoor temperatures drop to 20 degrees Fahrenheit or below, especially if they are in unheated spaces. The risk increases the longer the cold lasts. Insulation and heat help, but results depend on your home's layout and the severity of the cold.

Should I let faucets drip during a freeze?

Letting a faucet drip can help prevent freezing because moving water is less likely to freeze. Open the faucet slightly so water runs in a steady trickle. This is most effective for pipes on exterior walls or in cold areas.

What damage can a burst pipe cause?

A burst pipe can release hundreds of gallons of water, damaging drywall, flooring, insulation, and personal belongings. Water can spread quickly and cause mold if not dried properly. Call the pros to extract water and dry the area.

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