Active spray or steady stream
Water is shooting, misting, or running hard from a pipe, fitting, or wall cavity.
Start here: Shut off the main water immediately. Do not keep testing fixtures until the leak is isolated.
Plumbing
Frozen Pipe Burst
Direct answer: A frozen pipe usually bursts at a split, pinhole, or fitting that opened while the water inside expanded. Start by shutting off the water, then trace the first wet point on the pipe instead of chasing the puddle on the floor.
Most likely: Most often, the break is on an exposed water line in an unheated wall, crawl space, basement rim area, garage, or near an exterior hose connection.
If a pipe froze and now you have water showing up, move fast but stay methodical. The real job is to stop the water, find the exact split, and decide whether this is a simple local repair or a hidden damage call. Reality check: the visible drip is often a few feet away from the actual burst. Common wrong move: thawing blindly before shutting the water off and turning a small split into a soaked wall or ceiling.
Don’t start with: Do not start with a torch, open flame, or guess-buying random plumbing parts before you know exactly which section failed.
First moveShut off the main water supply and open nearby faucets to relieve pressure.
Best clueFollow the pipe to the highest or earliest wet spot, not the biggest puddle.
Last reviewed: 2026-04-04
What a frozen pipe burst usually looks like
Slow drip after temperatures rise
The pipe was frozen earlier, and now a seam, elbow, or straight section is dripping.
Start here: Dry the pipe, then inspect the full exposed run for a hairline split or a crack at a fitting.
Wet wall, ceiling, or floor but no obvious pipe opening
You see staining or pooling after a freeze, but the pipe itself is hidden or only partly visible.
Start here: Look for the nearest cold-area supply line and trace back to the first wet framing or insulation.
No water at first, then leak when flow returns
A faucet stopped during freezing weather, then later water came back and a leak appeared.
Start here: Assume the pipe split while frozen and opened once pressure returned. Check the frozen section first.
Most likely causes
1. Split in an exposed water supply pipe
This is the classic freeze failure. Straight runs near exterior walls, crawl spaces, garages, and rim joists are common burst points.
Quick check: Dry the pipe and look for a lengthwise crack, bulge, or fine line that wets up first.
2. Cracked fitting or valve body on the frozen section
Water often breaks the weaker point first, especially at elbows, tees, shutoffs, and hose bib connections.
Quick check: Check around threaded joints, soldered fittings, and small shutoff valves for beads of water forming at one point.
3. Hidden burst inside a wall, ceiling, or insulated cavity
If the exposed pipe looks dry but nearby materials are wet after a freeze, the break may be buried in the coldest concealed section.
Quick check: Look for damp insulation, staining, or dripping from a penetration where the pipe enters the wall or floor.
4. More than one freeze-damaged spot
A hard freeze can damage several weak points on the same branch, and the first visible leak is not always the only one.
Quick check: After finding one split, keep inspecting the rest of that cold-area run before restoring full pressure.
Step-by-step fix
Step 1: Shut the water down and stabilize the area
Stopping pressure limits damage and gives you a clean starting point. With frozen-pipe leaks, every extra minute under pressure can soak framing, insulation, and finishes.
- Shut off the main water supply if the leak is active or the damaged section is not isolated.
- Open the lowest faucet you can reach and one nearby faucet on the affected branch to relieve pressure.
- If water is near outlets, extension cords, appliances, or a finished ceiling with sagging drywall, keep clear and cut power to that area only if you can do it safely.
- Move storage, rugs, and anything absorbent out of the wet area.
- Place towels, a pan, or a bucket under the leak if it helps contain drips without putting you in an unsafe position.
Next move: The leak slows or stops, and you can inspect without new water spreading. If water keeps flowing hard, the wrong valve is off, a second branch is feeding the leak, or the break is larger than you can safely contain.
What to conclude: You need positive shutoff before anything else. Until pressure is off, diagnosis is secondary.
Stop if:
- You cannot find a working main shutoff quickly.
- Water is entering a light fixture, panel area, or finished ceiling that looks ready to collapse.
- The leak is inside a wall or ceiling and water damage is spreading fast.
Step 2: Find the first wet point on the pipe run
The puddle is rarely the source. Freeze breaks usually show up at the earliest wet spot on the coldest section of pipe or fitting.
- Start at the area most exposed to cold: exterior wall runs, crawl spaces, basement rim joists, garages, attic edges, and hose bib feeds.
- Wipe exposed pipes and fittings dry with a rag so fresh moisture stands out.
- Look for a lengthwise split, pinhole spray mark, bulged section, cracked elbow, or water beading at a shutoff or tee.
- Check both sides of insulation if it is already loose or wet, but do not tear open finished walls just to hunt blindly.
- Mark each suspect spot with tape or a photo before you move on.
Next move: You identify one clear split, crack, or leaking fitting on an exposed section. If everything exposed stays dry while nearby materials keep wetting up, the burst is probably concealed.
What to conclude: An exposed failure may be a manageable local repair. A hidden failure usually means opening access or calling a plumber before damage spreads.
Step 3: Separate a simple local repair from a hidden or multi-point failure
This is where you decide whether you are fixing one reachable spot or dealing with a larger freeze event. That choice keeps you from making a small patch on a pipe run that has more damage waiting.
- If the leak is on one exposed straight section, inspect at least several feet in both directions for a second split or cracked fitting.
- If the leak is at a valve, elbow, tee, or hose bib feed, inspect the connected pipe immediately upstream and downstream for hairline cracks.
- If the pipe disappears into a wet wall, ceiling, or floor cavity, assume there may be hidden damage beyond the visible stain.
- If the branch froze badly enough that no water flowed earlier, check other nearby cold-area lines before planning a repair.
- Do not restore full pressure yet just because you found one damaged spot.
Next move: You can clearly classify the problem as one exposed damaged section, one exposed damaged fitting or valve, or a concealed leak that needs access. If you cannot tell whether the damage is limited, treat it as a larger repair and bring in a plumber.
Step 4: Make the repair only if the damaged section is exposed and straightforward
Once the leak is confirmed, the repair path depends on what actually failed. For this page, the safe homeowner lane is a local exposed repair, not major repiping or blind wall opening.
- If a straight exposed section is split, plan to cut out the damaged portion and replace it with the correct matching pipe and approved connection method for that pipe type.
- If a small exposed shutoff or fitting body is cracked, replace that exact local component rather than trying to seal over the crack.
- If the leak is at a threaded joint that clearly loosened rather than cracked, disassemble and remake the joint only if the piping is fully supported and accessible.
- If the pipe is concealed, badly corroded, poorly supported, or damaged in more than one place, stop and schedule a plumber.
- After the repair is complete, keep the area open and visible for testing.
Next move: You have one solid repair on an exposed section and the line is ready for a controlled pressure test. If the repair requires opening walls, soldering in a risky location, special tools you do not have, or adapting between materials you are unsure about, this is no longer a good DIY stop.
Step 5: Restore pressure slowly and protect the pipe from freezing again
A careful restart tells you whether the repair actually held and whether another freeze-damaged spot is waiting. Prevention matters here because the same cold pocket will usually do it again.
- Close the opened faucets except one nearby faucet left slightly open to bleed air as you restore water.
- Turn the main water back on slowly and watch the repaired area and the rest of the cold run for several minutes.
- Check for fresh beads, misting, or dampness at every fitting you inspected earlier.
- Once the line stays dry under pressure, add frozen-pipe protection such as pipe insulation on exposed runs in the cold area.
- If the location is known for repeated freezing and the product is rated for that use, add pipe heat cable only according to its instructions and only on suitable pipe runs.
A good result: The line holds pressure, nearby fixtures work normally, and the repaired area stays dry.
If not: If another leak appears, pressure drops, or hidden materials start wetting up, shut the water back off and call a plumber for a broader repair.
What to conclude: You either solved a local exposed freeze break or confirmed that the damage extends farther than the first leak showed.
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FAQ
Can a frozen pipe burst without leaking right away?
Yes. A pipe can split while frozen and not show itself until the ice thaws or water pressure returns. That is why a line that was dead during a freeze should be checked carefully once flow comes back.
Where do frozen pipes usually burst?
Usually at the coldest exposed section or at a nearby fitting, valve, elbow, or tee. Common spots are crawl spaces, garages, basement rim areas, exterior walls, and hose bib feeds.
Can I patch a burst frozen pipe temporarily?
A pressurized split is not a good place for a casual patch. If the damage is exposed and simple, the proper fix is replacing the damaged section or cracked local component. If it is hidden or larger, shut the water off and call a plumber.
Should I turn the water back on to find the leak?
Only after you have the area under control and are ready to watch the pipe closely. Turn it on slowly, not all at once. If the source is still unknown and damage is spreading, keep it off until the leak is exposed or a plumber arrives.
Is one burst spot usually the only damage?
Not always. A hard freeze can damage more than one point on the same branch. After finding one split, inspect the rest of that cold-area run before you assume the job is done.
What if the pipe is inside a wall?
If the wall or ceiling is wet after a freeze and the exposed pipe looks dry, the break may be concealed. At that point, the safest move is usually to keep the water off to that section and bring in a plumber before more finish damage builds up.