How to Repair a Burst Water Pipe

A burst pipe is one of those basement discoveries that stops your day cold. Water pooling around your foundation, the sound of running water you can't locate, or a sudden drop in pressure—these are the calls that send homeowners into emergency mode. The good news is that not every burst requires calling a plumber at midnight. Small ruptures and pinhole leaks respond well to temporary and permanent fixes you can handle yourself. What matters is acting fast, knowing what you're looking at, and understanding the difference between a quick patch and a real repair.

1. Stop the Water Now. Find the main water shutoff valve (usually near the basement entrance, water heater, or where the water line enters from the street) and turn it clockwise until it stops. If the burst is on a branch line to one fixture, you may have a local shutoff valve under that sink or behind that toilet—use it first to keep water running elsewhere. Turn on a faucet downstream to release remaining pressure in the line.
2. Know Your Enemy. Once the water stops, examine the pipe closely. Look for a small pinhole, a hairline crack, or a full split. Feel for moisture and trace the wet area—the burst point may not be where the puddle is largest. If the pipe is copper, check whether the burst is a clean split or a corroded rupture. If it's PVC, note whether the pipe is still structurally sound or if a section is crushed or severely cracked.
3. Dry Everything First. Use a dry cloth or old towel to wipe away all water and moisture from the burst area and 6 inches on either side. If the pipe is still damp, use a hair dryer on low heat or wait 15 minutes for air drying. Any moisture left will prevent tape from sticking or will seep through filler compounds, undoing your repair.
4. Seal with Self-Fusing Tape. Unwrap self-fusing silicone tape (a rubberized waterproof tape that bonds to itself). Stretch it slightly as you wrap it around the pipe in overlapping spirals, starting 2 inches before the hole and ending 2 inches after. Overlap each wrap by half the tape width. Press firmly with each pass so the tape fuses to itself and the pipe. For extra security, wrap a second layer over the first.
5. Clamp the Crack Tight. Position a pipe repair clamp (a metal or rubber shell with bolts) so the rubber gasket sits directly over the crack. Tighten the bolts evenly with a wrench, alternating sides so the clamp seats uniformly. Tighten until snug—don't over-torque, or you'll crush a copper pipe. The clamp should be watertight but the pipe shouldn't look deformed.
6. Cut and Replace Section. Mark the pipe 6 inches on either side of the burst. Use a hacksaw or reciprocating saw to cut straight through at each mark. Remove the damaged section. For PVC: dry-fit two slip couplings over the pipe ends, apply PVC primer to all surfaces, then cement the coupling to each side. For copper: use two compression couplings or solder new slip couplings in place if you have soldering equipment and experience. Hold the pipe steady while working and let adhesive cure before restoring water.
7. Verify the Seal Holds. Once the repair has set (PVC cement takes 24 hours for a pressure line; copper solder is immediate), slowly open the main shutoff valve. Open a nearby faucet to bleed air from the line, then let water run for 30 seconds. Close the faucet and watch the repaired section for 5 minutes. Check under and around the pipe with a dry cloth—any moisture means the repair failed and you need to try again or call a plumber.
8. Plan the Real Repair. If you used tape or a clamp, check that area every 2–3 weeks for any weeping or new cracks. A temporary seal buys you time but not reliability. Schedule a call to a plumber or plan a full section replacement within a month or two. If the pipe is old (over 40 years) or shows other soft spots or corrosion, budget for a whole-line replacement—one burst often signals others on the way.