Temporary Burst Pipe Repair Before the Plumber Arrives
Step 1: Shut Off the Water Supply
Before attempting any repair, stop the water flow completely. Locate your main water shutoff valve, which is typically found in one of these locations: near the water meter at the street (usually a buried valve box with a round or rectangular cover), in the basement or crawl space where the main water line enters the house, in a utility closet or mechanical room, or on an exterior wall near the water heater.
Turn the valve clockwise (for gate valves) or perpendicular to the pipe (for ball valves) to close it. If the main shutoff is stuck or corroded, try the street-side shutoff at the water meter, which requires a meter key or large adjustable wrench to turn. For a burst that is isolated to a single fixture, closing the local shutoff valve under the sink or behind the toilet may be sufficient without shutting off the entire house.
If you cannot find or operate any shutoff valve, call your water utility company for emergency shutoff. Most utilities provide 24/7 emergency service and can shut off water at the curb stop within 30 to 60 minutes.
Step 2: Drain the Remaining Water
After closing the shutoff valve, open faucets at the lowest point in the house to drain water remaining in the pipes above the break. This relieves pressure on the damaged section and reduces the amount of water that will leak when you work on the repair. Open both hot and cold taps, as the burst may be on either supply line.
Flush toilets to empty the supply lines feeding the bathrooms. If the burst is on a hot water line, the water heater still contains 40 to 80 gallons that will slowly drain through the break unless you close the cold water inlet valve on top of the water heater. Closing this valve prevents the water heater from feeding the leak through the hot water distribution system.
Place towels, buckets, and plastic sheeting under and around the burst location to catch any remaining water. Even with the supply shut off, water trapped in the pipes above the break will continue to drain by gravity for several minutes.
Step 3: Locate and Assess the Break
With the water off and the area manageable, examine the pipe to determine the type and size of the failure. The repair method depends on what went wrong.
A pinhole leak or small crack (under 1/4 inch) is the easiest to temporarily repair. Epoxy putty, pipe wrap tape, or a small repair clamp can seal these effectively. Pinhole leaks in copper pipe are common in homes with aggressive water chemistry and typically appear as a small green-stained wet spot on the pipe surface.
A longitudinal split (a crack running along the length of the pipe, typically 1 to 6 inches long) is common in pipes that froze and expanded. A pipe repair clamp or a rubber patch with hose clamps can bridge the split and seal it temporarily. The longer the split, the larger the patch needed.
A complete separation (the pipe has broken apart into two pieces) requires a compression coupling or slip coupling to rejoin the sections. This is the most difficult temporary repair and may require cutting the pipe ends clean with a pipe cutter or hacksaw.
A joint failure (a soldered, glued, or threaded connection has come apart) requires either re-tightening the fitting, applying epoxy around the joint, or using a repair coupling to bridge the gap. Joint failures at threaded connections can sometimes be temporarily fixed by wrapping with PTFE tape and retightening.
Step 4: Apply a Temporary Patch or Clamp
Choose the repair method based on the type of break you identified. Multiple methods are described below in order of effectiveness and reliability.
Pipe repair clamp (best option for most breaks): A pipe repair clamp is a two-piece metal sleeve with a rubber gasket that bolts around the pipe over the damaged area. These clamps cost $8 to $20 at hardware stores and come in sizes to fit standard residential pipe diameters (1/2 inch, 3/4 inch, and 1 inch). Clean the pipe surface around the break with a rag to remove debris, center the rubber gasket over the damaged area, place the two clamp halves around the pipe, and tighten the bolts evenly until the gasket compresses firmly against the pipe. A properly installed pipe repair clamp can hold for weeks or even months and is the most reliable temporary repair available to homeowners.
Epoxy putty (good for pinhole leaks and small cracks): Epoxy putty is a two-part compound that you knead together and press onto the pipe over the damaged area. The putty cures in 15 to 30 minutes and forms a hard, waterproof seal. Clean and dry the pipe surface thoroughly before applying, because epoxy does not bond well to wet or dirty surfaces. Knead the putty until the two components are fully blended (uniform color), then press it firmly around the pipe, covering the damaged area with at least 1/2 inch of overlap on all sides. Hold the putty in place for 2 to 3 minutes until it begins to set, then allow the full cure time before restoring water pressure.
Rubber patch with hose clamps (good for splits and cracks): Cut a piece of rubber (from an old inner tube, a rubber sheet, or even a section of garden hose split lengthwise) large enough to cover the damaged area with at least 1 inch of overlap on each side. Place the rubber over the break and secure it with two or three hose clamps (also called worm gear clamps) positioned on each side of the damage and over the center. Tighten the clamps firmly but not so tight that they cut through the rubber. This method works best on straight pipe sections where the clamps can seat evenly around the circumference.
Self-fusing silicone tape (good for small leaks under pressure): Self-fusing silicone repair tape bonds to itself (not the pipe) when stretched and wrapped tightly, creating a waterproof seal. Stretch the tape to roughly twice its resting length while wrapping it around the pipe in overlapping layers, building up at least 4 to 6 layers over the damaged area. This method can be applied while the pipe is still wet, making it useful for small leaks where you cannot fully stop the water flow. It is less effective for large breaks because the tape cannot bridge gaps.
Compression coupling (for complete separations): A push-fit or compression coupling (such as SharkBite brand fittings) can rejoin two clean-cut pipe ends without soldering or gluing. Cut the pipe ends square and clean with a deburring tool or fine sandpaper. Mark the insertion depth on each pipe end, push the coupling onto one end, then push the other pipe end into the coupling until it seats at the marked depth. These fittings cost $5 to $15 each and create a seal that is strong enough to serve as a permanent repair in many situations, though a plumber may prefer to replace the section with a traditional soldered or cemented joint.
Step 5: Restore Water and Monitor
After the repair is in place and any epoxy or adhesive has cured for the specified time, slowly restore water pressure. Open the main shutoff valve gradually, turning it only a quarter turn at first to allow pressure to build slowly against the repair. Watch the patched area closely for any signs of leaking.
If the repair holds with the valve partially open, continue opening the valve slowly until it is fully open. If the repair begins to leak under partial pressure, close the valve immediately and reinforce the patch. For epoxy repairs, add a second layer. For clamp repairs, tighten the bolts further or reposition the gasket. For rubber patches, add additional hose clamps.
Keep towels and a bucket positioned under the repair for the first 24 hours, even if it appears to be holding. Temporary repairs can fail under pressure changes caused by flushing toilets, running appliances, or temperature fluctuations. Check the repair several times during the first day and at least once daily until the plumber completes the permanent fix.
Step 6: Schedule a Permanent Repair
Every temporary repair described above is exactly that: temporary. Even the most secure pipe clamp or compression coupling should be inspected and potentially replaced by a licensed plumber who can assess the overall condition of the pipe, determine why it failed, and make a repair that will last for the remaining life of the plumbing system.
When you call the plumber, describe the location of the break, the type of pipe material (copper, PEX, PVC, CPVC, galvanized steel), the type of failure (pinhole, split, separation, joint failure), and the temporary repair method you used. This information helps the plumber bring the right materials and tools on the first visit, avoiding a second trip that delays the permanent fix.
If the pipe that burst is part of an aging system with visible corrosion, mineral buildup, or previous repair patches elsewhere, discuss with the plumber whether spot repair is sufficient or whether the system is showing signs of widespread deterioration that may warrant a more extensive replacement.
Temporary Repair Supplies to Keep on Hand
Keeping a basic pipe repair kit in the house means you can address a burst pipe immediately rather than driving to a hardware store while water sprays. A practical emergency kit includes: two pipe repair clamps in 1/2 inch and 3/4 inch sizes ($8 to $20 each), one stick of plumber epoxy putty ($5 to $10), a roll of self-fusing silicone tape ($5 to $15), four hose clamps in assorted sizes ($1 to $3 each), a 12 by 12 inch piece of rubber sheeting ($5 to $10), PTFE thread seal tape ($2 to $5), and an adjustable wrench. The total kit costs $40 to $80, which is trivial compared to the water damage that continues while you search for supplies.
What Not to Do
Do not use duct tape. Despite its reputation as a universal repair material, duct tape does not create a waterproof seal on pipes under pressure. The adhesive fails when wet, and the tape cannot withstand the continuous water pressure in a supply line. Duct tape may slow a drip temporarily, but it will not hold against any meaningful water flow and gives a false sense of security while damage continues behind the tape.
Do not use JB Weld or automotive epoxies. Products designed for automotive or general metal repair may not be rated for contact with potable water. Use only epoxy products specifically labeled for potable water pipe repair to avoid introducing chemicals into your drinking water supply.
Do not attempt to solder a repair with water in the pipe. Soldering requires the pipe to be completely dry and free of water. Even a small amount of residual water in the pipe turns to steam during soldering and prevents the solder from flowing into the joint, creating a repair that looks solid but leaks under pressure. Professionals drain and dry the pipe section completely before soldering, which is why temporary mechanical repairs are more practical for emergency situations.
Do not ignore a slow leak. A leak that produces only a slow drip after your temporary repair may seem manageable, but even a slow drip delivers gallons of water per day into building materials. A drip that falls once per second produces approximately 5 gallons per day. Over the days or weeks before a plumber visit, that drip saturates drywall, subfloor, and framing, creating conditions for mold growth and structural damage that far exceed the cost of the pipe repair itself.
Shut off the water first, then apply the best temporary repair available: a pipe repair clamp for most breaks, epoxy putty for pinholes, or a rubber patch with hose clamps for splits. Monitor the repair closely and schedule a professional plumber for a permanent fix as soon as possible. Keep a basic pipe repair kit on hand so you can act immediately when a pipe fails.