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What Is the Most Common Pipe to Freeze in a House?

Last updated October 19, 2026

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The short answer

Why Exterior Walls and Attics Are Vulnerable

Pipes running inside exterior walls are directly exposed to outdoor temperatures. Even a small gap in the siding or insulation lets cold air reach the pipe. Attics are often poorly insulated and unheated, so pipes there can freeze quickly. These pipes are also frequently forgotten during winter preparation, leaving them at high risk.

Crawl spaces under a house can be just as cold as the outdoors. If the vents are not closed for winter, cold air circulates freely. Pipes under the house receive no warmth from your living areas. This makes them prime candidates for freezing, especially during a hard freeze.

Outdoor Faucets and Supply Lines

The pipes leading to your outdoor faucets, or hose bibs, are extremely common freeze points. These lines often have a shutoff valve inside your home. If you forget to shut that valve and drain the line, trapped water expands as it freezes. The ice pressure can crack the pipe or the faucet itself.

When the thaw comes, water flows from that crack. It can soak siding, foundation soil, and even flood a basement or crawl space if the faucet is on a lower level. Always disconnect hoses before winter and know how to drain these exterior lines properly to prevent this issue.

  • Hose bibs on the north side of a house get the least sun.
  • Uninsulated pipes in a garage can freeze if the door is left open.
  • Pipes in a kitchen cabinet on an exterior wall need cabinet doors left open.
  • Pipes in a basement near an uninsulated rim joist are at risk.
  • Any pipe with a slow leak is more likely to freeze solid.
  • Metal pipes conduct cold faster than plastic, but both can burst.

How to Find and Protect These Pipes

Start by locating all pipes in unheated spaces. Look in your attic, crawl space, basement, and garage. Check where pipes enter your home from the outside. Feel for drafts near pipes in cabinets or closets on outside walls. Identifying these spots is the first step in protecting your home.

For pipes you can access, use pipe insulation sleeves or heat tape. Seal gaps in walls or foundations where cold air enters. Keep cabinet doors open to let warm air circulate around pipes under sinks. Let a faucet drip slowly on very cold nights to keep water moving in vulnerable lines.

What Happens When a Pipe Freezes

Water expands when it freezes, creating tremendous pressure inside the pipe. This pressure often finds the weakest point, like a seam, a joint, or a thin section of metal. The pipe may bulge or crack open. Sometimes the ice itself blocks the crack, so the leak only starts during the thaw.

When the ice melts, water flows from the break. It can flood a ceiling, walls, or floors before you notice. The water seeks the lowest point, potentially damaging multiple rooms. This is why a burst pipe often requires extensive water extraction and drying work from local water damage pros.

Immediate Steps After Discovering a Burst Pipe

Your first move is to shut off the main water supply to your house. This stops the flow and limits the damage. Then, turn on the faucets to drain the remaining water from the system. If it's safe, turn off electricity to the affected area. Move valuables and furniture out of the water's path.

Contact local water damage pros for water extraction and structural drying. They use specialized equipment to remove water and dry out building materials. Mold can begin growing within 24 to 48 hours in damp conditions, so prompt drying is crucial. Policies vary, and your insurer decides what is covered.

  • Know the location of your main water shutoff valve.
  • Keep the number for a trusted plumber handy.
  • Take photos of the damage for an insurance claim.
  • Do not use electrical appliances while standing in water.
  • Remove saturated rugs and textiles to prevent staining.
  • Avoid attempting major repairs yourself if you are unsure.

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Frequently asked questions

Can pipes freeze even if the heat is on?

Yes, pipes in unheated, drafty areas can still freeze. If your heat is set very low during a cold snap, or if there is poor insulation around a pipe, it can reach freezing temperatures. Keeping interior doors open and letting faucets drip adds protection.

How much does burst pipe cleanup cost?

Cleanup costs depend heavily on the water volume and affected areas. A small leak may cost a few thousand dollars, while extensive flooding can cost much more. The final cost depends on drying time, materials damaged, and needed repairs.

Will insurance cover the water damage?

Insurance coverage for water damage depends on your specific policy and the cause of the loss. Policies vary, and your insurer decides what is covered. Damage from a sudden burst pipe is often covered, but damage from a lack of maintenance may not be. You should review your policy and speak with your agent.

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