Corroded pipework? Replace the failing sections before they burst in Wolverhampton

What corrosion actually is

Copper corrodes from the inside. Water with the wrong pH, high chloride levels or a stray electrical current will eat into the wall of the pipe until it is tissue-thin, and the first sign is often a pinhole leak rather than a visible stain. The green crust you see on the outside is usually the result of a slow weep reacting with air, not the cause. Steel pipe rusts from within and closes up as the rust builds, which shows as falling pressure and brown water. Plastic pipe does not corrode, but it degrades: it goes brittle with heat and UV, and older grey polybutylene has a poor reputation at fittings. Galvanised pipe in older properties is often furred almost solid in the middle. None of this is visible from the outside until something fails.

Why corroded pipework gets worse

Corrosion is a one-way process. The wall thickness only decreases, and once pinholes begin they tend to multiply along the same run, because the water chemistry and the pipe condition that caused the first one are still there. Flow drops as the bore narrows, so showers weaken and combi boilers struggle to meet demand. Rust and corrosion debris travel, blocking aerators, valves and heat exchangers downstream, which turns a pipe problem into an appliance problem. Disturbing a corroded run, for example when fitting a new tap or appliance, frequently triggers the next leak because the pipe cannot take the movement. The cost curve is simple: one planned replacement is cheaper than three emergency repairs and the damage that comes with them.

How we assess the pipework

We look at the pipe's age, material and appearance, then check what the water is doing: pressure at the furthest outlet, flow rate, and whether the water runs clear after standing. Green or white crusting at joints, pitting on the surface and a thin, soft feel where the pipe has been scraped all point the same way. We check the earth bonding, because a live earth on a corroded pipe accelerates the problem and is a safety matter. Where the pipe is concealed, we inspect at accessible points and use pressure testing to establish whether a run is losing water. The output is a straightforward plan: which sections need replacing now, which can wait, and what that involves in terms of access.

How we replace it

The supply is isolated and the run drained. We cut out the corroded sections back to sound pipe or, where the whole leg is spent, replace the run from the isolation valve to the outlet. New pipe is sized to suit the demand it serves, routed to avoid the conditions that caused the failure, and clipped and sleeved properly where it passes through walls and joists. Fittings are matched to the material, and any transition between copper and plastic is made with the correct fitting rather than an improvised one. On heating circuits we add inhibitor at the correct strength after refilling. Then the system is flushed, pressure tested and run at working temperature, with flow checked at the furthest outlet. Access openings are left neat and ready for making good.

Preventing a repeat

Get the water chemistry right: if corrosion has been a recurring problem, ask for a water test and consider a phosphate dosing unit or a scale reducer as appropriate. Keep inhibitor in any heating system and check its strength every few years. Make sure the property's earthing and bonding are correct, particularly where pipework has been altered. Avoid disturbing old pipe unnecessarily, and support new runs so they do not flex. If a property has original thin-wall copper or galvanised supply pipe, plan replacement room by room rather than waiting for failures. Lagging cold pipe reduces condensation, which is what makes the outside of a pipe look wet and corrode from without.

When to call us

Call if you have had two or more pinhole leaks on the same run, if cold water runs brown or cloudy when first turned on, if pressure at upstairs taps has dropped noticeably, or if you can see green crusting or white deposits at joints. Call immediately if a corroded pipe is leaking or weeping, or if you can smell gas near pipework, which is a separate emergency for the gas network. Surface discolouration alone can be assessed on a booked visit.

Book a call-out

Send us photographs of the pipework and a note of what the water is doing; that is often enough for us to advise whether an assessment visit or a replacement is the right next step. If the pipework is behind boxed-in sections or under flooring, we will be clear about what needs opening and why. Book a visit and we will tell you honestly which sections need renewing now and which can safely wait.