A burst pipe is two emergencies at once: stop the water, then find out why the pipe froze. Shut the main, open a low faucet or hose bib to drain the line down, and call. Most of the splits we cut out are half-inch or three-quarter-inch copper in an exterior wall, a garage wall, an unheated ceiling bay or a crawl space — places where the line was never insulated. The repair replaces the failed section in copper, then insulates or reroutes the run so the same cavity cannot do it again.
What to do the moment a pipe bursts
- Shut the main. It is usually where the water service enters the house, often near the water heater or in a utility area.
- If the main will not turn, do not force it. A great many of the ones we meet are seized, leaking or broken. We have arrived to find a main gate valve that would not close at all, one that the homeowner could only move with a pipe wrench, one that was pulling out of the wall, and one that had been buried behind finished drywall by a previous contractor.
- Open the lowest faucet or hose bib in the house so the pipes drain down and stop feeding the split.
- Cut power to anything wet, including an electric water heater whose elements can fire in an emptying tank.
- Photograph everything before it is moved. Wet carpet, soaked insulation and stained ceilings all matter later.
- Call us. We answer 24 hours a day — see emergency plumber.
A house with no working main shut-off is a genuinely hard job. On one commercial property where the building main had been broken for months, the only way to change valves at all was to freeze the pipe locally: eight separate nitrogen bottles, four different areas, done twice. That is what it costs in time when the one valve that should work does not.
Why pipes freeze and burst in Northern Virginia houses
Freezing is not really about how cold it got outside. It is about which lengths of pipe were sitting in unconditioned air with no insulation around them. In our contract record the same handful of locations come up over and over:
- Exterior wall cavities behind kitchen base cabinets. A cabinet blocks room heat from reaching the wall, and the water line and the dishwasher drain behind it sit in outside air.
- Garage walls. Copper run through a garage wall to feed a fixture beyond it has no heat on either side.
- Unheated ceiling bays and attic runs. We have opened bathroom ceilings to find half-inch copper frozen and split, and run a leak search into the attic to find the rest of the run.
- Crawl spaces and hydronic lines. A copper radiator supply line that froze and split flooded a basement on one call.
- Lines running out to hose bibs, especially where they cross an unheated basement ceiling uninsulated.
- Runs that pass outdoors and back in, such as a line coming from a patio into a closet.
- Insulation that went missing during earlier work. On a bathroom floor rebuild we found insulation had been lost at the exterior wall and from around the plumbing pipes entirely.
Where a frozen pipe is usually found
The split is rarely where the water shows. Water runs along joists and down cavities and emerges at the first seam it can find, which is why the search comes first — the same method used for pipe repair and leak detection.
- Water coming down from a ceiling
- We open the ceiling and run a leak search. On one call the water was not coming from the ceiling at all — removing a section of paneled wall found a burst frozen pipe in the exterior wall cavity behind it.
- Flooding at a wall and floor junction
- A frozen copper line that burst inside the wall, soaking drywall, insulation, the wall itself and the floor, with the water appearing at the base.
- A wet kitchen wall behind a cabinet
- The loose end base cabinet comes out to reach the back wall, and the cavity behind it is almost always found uninsulated.
- A second leak appearing after the first is fixed
- After one hydronic system was re-pressurized the homeowner found a second frozen split, in three-quarter-inch copper running through a ceiling and down a wall. Freezing rarely picks one spot.
- Icy water out of a vent line
- On a heater throwing a blocked-intake fault, opening the vent line produced cold icy water — a frozen condensate and vent blockage rather than a failed appliance.
How a burst pipe repair is done
- Locate the split before cutting. Leak search first, including the attic or crawl space where the run goes there.
- Drain the system down. Every copper repair on our contracts starts this way.
- Open only what is needed to reach it — a hole in a ceiling, a section of wall four to five feet long, a paneled wall removed, or a base cabinet pulled out.
- Replace the failed length in copper. A typical repair is a few feet of partial half-inch or three-quarter-inch copper, with new hot and cold line run in where the damage extends.
- Reroute the line where it cannot be protected where it is. On one job the frozen run passed behind a bathroom vanity and toilet; the fixtures came out, the wall was opened and the copper was rerouted away from the cold cavity.
- Add an isolation valve so that section can be shut down on its own next time. On one house this could not be done as found, because a previous owner had installed a valve in the bathroom and left a dead leg inside the water heater room — so the line was raised to take a proper valve.
- Refill and test the entire system, not just the joint that was replaced.
- Insulate before closing up — commonly eight to ten feet of hot and cold line either side of the repair.
Frozen shut-off valves, main valves and hose bibs
“Frozen” also describes a valve that has seized solid, and in this trade the two problems arrive together. A hard winter finds every valve in the house that was already failing.
- Angle stops that will not close. On a condo call the stops under a bathroom sink were seized and broken, so the water had to be shut to the entire unit — and checking the rest of the unit turned up several more.
- Toilet stops. One call about a toilet running non-stop found its stop seized, and two more seized valves in the same bathroom.
- Kitchen and laundry valves, including multi-turn stops we replace with quarter-turn valves as a matter of course.
- Outside hose bibs, frozen shut, leaking from the stem, or fed with CPVC that has failed at the transition — we transition those back to copper.
- The main itself. Where the main is seized, too low to operate or buried behind drywall, we replace it with a ball valve with a bleeder and, on one job, raised it four to five feet so it could actually be reached, leaving the old valve in place to control the hose bib.
The reason valves fail in groups is usually water pressure, not age alone — see water pressure, PRVs and shut-off valves.
Water damage after a burst pipe: what has to come out
Everything the water touched has to be assessed, not just what looks bad. After one burst pipe into a finished basement the work list read: carpet, padding and tack strips lifted from the floor; wood paneling removed from the wall the water ran through; paneling and wall insulation above the bar removed; two to three feet of ceiling drywall and the ceiling bulkhead taken down.
Then the rebuild: mold control treatment on all affected surfaces, framing sealed with primer before it is insulated and closed, new drywall both screwed and glued, taped, blocked, skimmed and sanded ready for paint. Wet insulation is replaced rather than dried in place. Related work is covered on drywall and ceiling repair and insulation and air sealing.
How to stop a pipe freezing again
A repair that puts the wall back exactly as it was has fixed nothing. What we do instead:
- Insulation panels between the framing in the cavity the pipe sits in, and a foam sleeve around the pipe itself for as much of the run as can be reached.
- Leave the pipe accessible. On kitchen wall repairs we have deliberately closed the drywall around the pipe area and left that section open behind the cabinet.
- Sleeve the pipe where it passes through floors and framing so it is protected and can move.
- Insulate the exposed run, typically eight to ten feet of hot and cold line each side of a repair, and any half-inch line crossing an unheated basement ceiling.
- Deal with the hose bibs before winter. Disconnect the hose — we have been called to a house where a hose had simply been left on the outdoor faucet all winter — and fit a quarter-turn, frost-proof bib with a vacuum breaker and an interior cut-off valve with a bleeder.
- Check the crawl space. On a kitchen wall repair we cut a one-foot opening in the floor purely to inspect the crawl space below before closing anything.
Do you need a permit for burst pipe repair in Virginia?
For the repairs described on this page, generally yes, and we pull and process the permit ourselves. Copper replacements, main valve replacements, hose bib and outdoor faucet work and re-routes are permitted plumbing work in the jurisdictions we serve. The work is performed to the Virginia building code and the county inspection is scheduled after completion, with the final portion of payment held until it passes.
There is a code item attached to every copper repair worth knowing about. In many Northern Virginia houses the metal water piping is part of the electrical grounding path, so once a length of pipe is cut out, continuity has to be restored across the gap with a bonding jumper or clamp before the job is closed.
What burst and frozen pipe repair costs
We do not quote this work by phone and we do not publish numbers. Two calls that sound identical on the phone — “a pipe burst in the wall” — can be three feet of copper behind an access hole, or a wall opened, a line rerouted, a main valve replaced, and a finished basement stripped back to framing.
An estimator comes to the property, finds the split, shows you the failed section and puts a written price in front of you before any work begins. In an active flood the first visit is about stopping the water; the written scope follows once everyone can see what the water reached.