Phone answered 24/7 · St. Petersburg, FL and nearby communities

Call 24/7: (727) 308-5518
Boca Ciega Bay Water ResponseWater Damage Help · St. Petersburg, FL

Why Do Pipes Burst in Cold Weather?

Last updated October 26, 2026

Call Now (727) 308-5518

The short answer

The Freezing Water Problem

Water is unusual because it expands when it freezes. As temperatures drop, the water inside your pipes can start to turn to ice. The ice takes up more space than the liquid water did, creating pressure against the pipe walls.

This pressure builds quickly, especially in a pipe that is already full. The pipe material, whether copper, PVC, or steel, can only hold so much force. When the pressure becomes too high, the pipe cracks or splits, often at a joint or a weak spot.

Where Pipes Usually Freeze

Pipes in unheated areas are the most at risk. This includes attics, crawl spaces, garages, and exterior walls. Even a small gap in insulation can let cold air reach a pipe and cause trouble.

In a place like St. Petersburg, freezing weather is rare, but it can still happen. If you live in St. Petersburg, know where your pipes run through unheated spaces. A quick check before a cold snap can save you a lot of cleanup later.

  • Exterior walls with little insulation
  • Attics or crawl spaces without heat
  • Garages that are not heated
  • Under sinks on outside walls
  • Pipes near drafty windows or vents

What Happens When a Pipe Breaks

When a pipe bursts, water pours out at high pressure. The water can soak drywall, flooring, and personal belongings quickly. The longer the leak goes unnoticed, the more damage it can cause.

The initial water is just the start. Moisture can wick up walls and under cabinets, leading to warped wood and peeling paint. If the water sits, mold can start growing within a day or two, creating a separate health concern.

You should act quickly to shut off your main water valve if you can do so safely. Then, call local water damage pros to assess the situation and begin drying things out.

Preventing Frozen Pipes

Prevention is easier than cleanup. During a cold snap, let a trickle of water run from faucets on exterior walls. Moving water is less likely to freeze solid.

Open cabinet doors under sinks to let warm room air reach the pipes. You can also wrap exposed pipes with foam insulation or heat tape. For a more permanent fix, a plumber can add insulation to vulnerable areas.

Know where your main shutoff valve is and how to turn it off. That simple step can limit damage if a pipe does break.

  • Keep cabinet doors open in cold weather
  • Let faucets drip slowly overnight
  • Wrap pipes with foam insulation
  • Seal gaps around exterior walls
  • Find and label your main shutoff valve

After the Burst Cleanup

If a pipe has already burst, focus on stopping the water first. Turn off the main valve and then open faucets to drain the remaining water. Take photos of the damage for your insurance records.

The cleanup involves removing soaked materials and drying the area thoroughly. Water in walls and under floors can hide for a long time. Local water damage pros have the equipment to find hidden moisture and dry out the structure properly.

Policies vary, and your insurer decides what is covered. Check your policy to understand what steps you need to take.

Talk to someone now

Every hour counts once water gets into floors and walls. One call starts the response.

Call Now (727) 308-5518

Frequently asked questions

Can pipes burst even if the weather is only slightly cold?

Yes. Pipes can freeze when the temperature stays below about 20 degrees Fahrenheit for several hours. But wind chill and poor insulation can make it happen at warmer temperatures. Any pipe in an unheated space is at risk.

What should I do if I find a burst pipe?

Shut off your main water valve right away to stop the flow. Then, open faucets to drain remaining water. Take photos for your records, and call the pros to help with drying and cleanup.

Will a small crack heal on its own?

No. A cracked pipe will keep leaking and can worsen over time. You need a plumber to repair or replace the damaged section. Even a tiny crack can cause significant water damage if left alone.

Call Now (727) 308-5518