Burst pipe repair

The first five minutes

In order. Do not stop to investigate the cause. That comes later and it is not urgent.

1. Shut the water off. Nearest point first. Under a sink or behind a toilet there is a fixture stop valve. If the burst is not at a fixture, or the stop will not hold, go to the main, typically at the front of the property near the meter box, or on the street-side exterior wall. A quarter-turn ball valve needs ninety degrees; an older gate valve needs several full turns clockwise. If it will not move, do not force it hard enough to snap the stem.

2. Kill electricity to affected areas. If water is anywhere near outlets, light fittings, or a panel, switch off those circuits, but only if you can reach the panel from a dry position. If you cannot, leave the area and say so when you call.

3. Open the lowest taps in the house. With the main closed, opening a low fixture drains the remaining water in the system downward and away from the break instead of out through it.

4. Turn off the water heater. Gas to pilot, or the breaker off. A heater firing with no water supply damages itself.

5. Call, then start moving things. Get the call in before you start salvage, dispatch time runs in parallel with everything else you do.

6. Photograph everything. Before you mop, before you move furniture. Insurers ask for this and it is impossible to recreate later.

Why pipes burst here

Freezes, overwhelmingly. Water expands roughly nine percent as it freezes, and it does so inside a closed pipe with nowhere to go. What actually fails is usually not the ice itself but the pressure trapped between an ice plug and a closed fixture. Texas construction makes this worse than the physics alone requires: supply lines run through unconditioned attics, uninsulated exterior walls and open crawlspaces as a matter of normal practice here, because for most of the year that is entirely sensible.

Material matters to how it fails. Copper splits along its length, a clean seam that can be startlingly long. CPVC becomes brittle with age and shatters, often at a fitting. PEX expands and usually survives the freeze itself, then fails at a crimp or fitting where it could not stretch. Galvanised steel, already thinned from decades of internal corrosion, simply tears.

Corrosion. Not every burst is a freeze. Interior pitting from aggressive water thins copper until a section blows out under normal pressure. Galvanised does the same over a longer timescale.

Excessive pressure. Anything much above 80 psi stresses every joint in the house continuously. A failed pressure regulator can push a system to 120 psi or more, and the pipe eventually finds the weakest point. If you have had multiple unexplained failures, get the static pressure tested. You may be treating symptoms.

Physical damage and bad past work. A nail or screw driven into a line during renovation can weep for years then let go. Unsupported runs work-harden at fittings until they crack.

How the repair is done

Finding the split. Sometimes obvious, frequently not. Water travels along joists and down inside wall cavities, so the visible wet spot is often well below or away from the failure. Where the break is not visible, the line is traced and pressure-tested to narrow it, and thermal imaging or acoustics used if it is hidden. After a hard freeze the working assumption is multiple failures, not one, and the system gets tested as a whole before anyone declares it fixed.

Opening access. Deliberately minimal. A stud bay, a ceiling section, or an attic approach where the pipe can be reached from above. Locating properly before cutting is what keeps this small.

Cut out and replace. The failed section is removed back to sound pipe on both sides, and how far that goes is a judgement call, because a freeze that split one section has usually stressed its neighbours. Replacement is joined with proper fittings appropriate to the material. Push-fit couplings have a place in an emergency at two in the morning; they are not a substitute for a properly made permanent joint in daylight.

Pressure test before closing up. The system is repressurised and held with the repair still visible. Finding a second leak after the drywall is back on is a bad outcome that testing prevents.

Insulate before it is buried. If this pipe froze once, it will freeze again in the same conditions unless something changes. Lagging the repaired section and its neighbours is part of the job, not an upsell.

Drying out, and dealing with the insurer

The plumbing repair is the fast part. What follows is often larger, and how it is handled in the first day or two determines whether you get mould in three weeks.

Get water out and air moving immediately, extraction, then fans and dehumidifiers, then patience. Wet insulation does not dry usefully in place and should come out. Carpet pad rarely survives. Wet drywall wicks upward, so the damage line is generally higher than it looks, and cutting a clean line above the wet is better than hoping.

On the insurance side, burst pipes are usually a good scenario for homeowners: sudden accidental discharge is covered by most Texas policies, in contrast to the gradual seepage exclusions that catch slow leaks. Which makes documentation worth doing properly. Photograph before you touch anything. Keep the removed section of pipe. The physical evidence of a split is persuasive. Get the plumber's written description of cause and location. Log every dated expense, including fans you rent and hotel nights if the house is unliveable. Call the insurer the same day, because most policies require prompt notice.

One caveat: if the burst happened because a vacant property was left unheated through a freeze, some policies limit or exclude cover. Worth knowing before you frame the claim.

Making it not happen again

Most burst pipes in Texas are preventable, and the prevention is cheap relative to a single repair.

Insulate the exposed runs. Attic, crawlspace, garage, exterior walls, and anything in an unconditioned space. Along the full length, including the awkward parts. This is the highest-value thing on the list.

Cover the hose bibs. A split exterior faucet floods a wall cavity from outside, and it is one of the most common freeze failures there is. Insulated covers cost a few dollars each. Disconnect hoses before winter. A connected hose keeps water in the bib where it can freeze.

Have a freeze routine. When a hard freeze is forecast: drip the taps at the furthest fixtures from the main, open cabinet doors under sinks on exterior walls, leave the heating on even if you are away, and know where the shut-off is.

Check your static pressure. If it is over 80 psi, a functioning pressure regulator is not optional. High pressure shortens the life of every joint, hose and appliance valve in the building.

Consider what the pipe is. Ageing CPVC and any remaining galvanised are the materials most likely to fail next. If a freeze has already split a system in several places, that is the system telling you something about its remaining life.