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Why Pipes Burst in Winter and What You Can Do About It

Last updated October 25, 2026

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The short answer

The Freeze and Thaw Cycle

In winter, water inside your pipes can freeze when temperatures drop below 32 degrees Fahrenheit. As water freezes, it expands by about 9 percent, which puts tremendous pressure on the pipe walls. Even a small ice blockage can cause the pipe to crack or split, especially if the pipe is old, thin, or already weakened.

When the ice thaws, the water flows again, but the damage is already done. Leaks may appear immediately, or they may show up days later as the pipe expands and contracts. The result is water spraying into walls, ceilings, and floors, leading to structural damage and mold growth if not addressed quickly.

Where Pipes Are Most at Risk

Pipes in unheated areas are most vulnerable. This includes crawl spaces, attics, garages, and exterior walls. Pipes that run through cabinets under sinks are also at risk because cabinet doors block warm air from reaching them.

Keep your shutoff valve location written down so you can act fast during a freeze. Also, check any pipes that have frozen before; they are likely to freeze again. Knowing where your pipes run and which ones are exposed helps you focus your prevention efforts.

  • Insulate exposed pipes with foam sleeves or heat tape
  • Keep cabinet doors open under sinks to let warm air circulate
  • Let a slow drip from faucets to keep water moving
  • Set your thermostat to at least 55 degrees when away
  • Seal gaps in walls and floors where cold air can reach pipes

What to Do If a Pipe Bursts

If you discover a burst pipe, shut off your main water valve immediately. This stops the flow and limits water damage. Then, turn off the electricity in the affected areas if it is safe, and avoid touching standing water until you are sure it is not electrified.

Next, call local water damage pros to handle the cleanup. They can extract standing water, dry out your home, and assess the damage to walls, floors, and ceilings. Acting quickly reduces the risk of mold and structural weakening.

Hidden Damage and How to Spot It

Not all pipe bursts are obvious. Water can travel along joists and behind walls, soaking insulation and drywall without visible puddles. You might notice damp spots, peeling paint, a musty odor, or a sudden increase in your water bill.

If you suspect hidden damage, a water damage inspection can find moisture that you cannot see. Professionals use moisture meters and thermal imaging to map wet areas. Catching hidden moisture early prevents costly repairs and health issues from mold.

  • Look for water stains on ceilings and walls
  • Check for warped or buckling floors
  • Listen for the sound of running water when all taps are off
  • Feel walls for cold or damp spots
  • Watch for a drop in water pressure

When to Call for Professional Help

After a burst pipe, you might be able to mop up small puddles, but significant water damage needs professional attention. Standing water can seep into drywall, insulation, and wood framing, creating conditions for mold within 24 to 48 hours. The pros have industrial-grade drying equipment and dehumidifiers to remove moisture thoroughly.

They also handle the messy parts like removing soaked carpet and drywall, which you might not want to do yourself. If your home is affected, reach out to a local service for burst pipe damage cleanup. They can restore your home to a safe, dry condition.

Water damage does not wait

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Frequently asked questions

At what temperature do pipes freeze?

Pipes can freeze when the temperature drops below 32 degrees Fahrenheit, but the risk increases when it stays below 20 degrees for several hours. Indoor pipes may freeze if your home loses heat, so keep your thermostat at least 55 degrees during cold snaps.

How long does it take for a pipe to burst after freezing?

It can take several hours or even days for a pipe to burst after the water freezes. The ice block expands and increases pressure, but the pipe may not crack until the ice thaws and water flow resumes. That is why you might not notice a leak immediately.

Does homeowner insurance cover burst pipes?

Policies vary, and your insurer decides what is covered. Many standard policies cover sudden and accidental water damage from burst pipes, but not damage from lack of maintenance or freezing due to an unheated home. Check your policy and ask your agent for specifics.

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