Burst Pipe Guide: Why Pipes Fail, What To Do, and How To Prevent the Next One
April 9, 2026 · 7 min read
Why pipes burst
Freezing is the classic cause: water expands ~9% when it freezes, and pressure builds between the ice blockage and a closed faucet until the pipe splits. But pipes also fail from age (galvanized steel corrodes from inside), water hammer stress, excessive pressure, and shifting foundations.
The first five minutes
Shut the main water valve — know where it is today, not during the emergency. Open faucets to drain pressure. Kill electricity to affected areas if water is near outlets or fixtures. Then document with photos and call for mitigation.
What professional cleanup involves
Thermal imaging finds everywhere water traveled inside walls and under floors — usually far beyond the visible wet spot. Extraction, targeted wall openings, structural drying with daily moisture logs, and repairs. Insurance typically covers sudden pipe failures including the water damage (though sometimes not the pipe repair itself).
Prevention that actually works
Before winter: insulate pipes in unconditioned spaces, seal exterior wall penetrations, disconnect hoses and shut off exterior spigots. During hard freezes: keep a pencil-thin drip running on vulnerable lines and open cabinet doors on exterior walls. Long-term: replace aging supply lines (braided steel over rubber), consider a smart water shutoff valve, and keep your home above 55°F even when away.