Why Pipes Burst After the Freeze Ends

Pipes usually crack during the freeze but leak after it. Ice blocks the pipe and pressure builds between the ice and a closed faucet until the pipe splits. While the water stays frozen, the ice plugs the crack. When it thaws, water starts flowing through the break.

That is why so many Tulsa homeowners find water pouring from a ceiling or wall the day the temperature climbs back above freezing, not on the coldest night. When it happens, burst pipe water damage cleanup should start the same day.

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Water streaming from a cracked ceiling after a pipe leak

What Actually Happens Inside a Frozen Pipe

01
Water freezes and expands. Ice takes up more room than liquid water.
02
An ice plug forms in the coldest section of pipe, often near an exterior wall, attic or crawl space.
03
Pressure builds downstream. Water trapped between the ice plug and a closed faucet has nowhere to go as more ice forms.
04
The pipe splits at its weakest point. This is often not where the ice is, but somewhere along the trapped section.
05
The ice keeps the crack sealed as long as it stays frozen.
06
The thaw opens it up. Once the ice melts, full house pressure pushes water out of the crack until someone shuts off the main.

This is also why letting faucets drip helps. An open faucet gives the trapped water and pressure a way out. More steps are in our guide to preventing frozen pipes in Tulsa.

Frozen pipe with a burst hole and icicles after a freeze

Where Hidden Thaw Leaks Show Up

Where the Pipe Is	What You Notice After the Thaw
Attic	Ceiling stain, sagging drywall, water dripping from a light fixture
Exterior wall	Wet baseboard, bubbling paint, damp carpet along the wall
Crawl space	Musty smell, soft floor, water bill jump, sound of running water
Garage	Water on the garage floor, wet drywall, soaked boxes
Outdoor spigot	Water inside the wall behind the spigot, or pooling at the foundation

Brown water stain and water dripping from a ceiling

What to Check the Day It Warms Up

Turn on every faucet and watch for low or no flow
Look up at ceilings under the attic, bathrooms and the water heater
Check baseboards and carpet along exterior walls
Look in the garage and under sinks on outside walls
Listen for running water with every fixture off
Check the water meter: if the dial moves with everything off, water is leaking somewhere
Run each outdoor spigot briefly and check inside the wall behind it

If You Find a Leak

01
Shut off the main water valve right away. If you are not sure where it is, read how to find and shut off your main water valve.
02
Turn off power to any room where water is near outlets or fixtures, if you can do it safely.
03
Stay out from under sagging ceilings.
04
Open faucets to drain the remaining water from the lines.
05
Take photos before you move or clean anything.
06
Call a plumber for the pipe and a water damage company for the drying. Water inside walls and ceilings will not dry on its own before it causes swelling and mold.

Burst Pipe FAQ

Why did my pipe burst when it wasn't even that cold?

The crack probably formed during an earlier hard freeze and stayed sealed by ice. It only started leaking once the pipe thawed.

Can a frozen pipe thaw without bursting?

Yes. Many pipes freeze and thaw without damage, especially when a faucet was open. You only know for sure once water flows again and you check for leaks.

How fast does a burst pipe cause damage?

A split pipe can release several gallons a minute. Drywall, insulation and flooring start soaking within minutes, and mold can begin within 24 to 48 hours. When the break is in the attic, the ceiling below usually needs ceiling water damage repair once it is dry.

Does insurance cover a pipe that burst after a freeze?

Sudden burst pipe damage is commonly covered by Oklahoma homeowners policies. Some policies have conditions if the home was left unheated. Your insurer decides.

Do Not Wait