Dripping overflow pipe in Macclesfield
In short
An overflow pipe that drips outside the house is not the fault — it is the warning. It means a float valve somewhere has failed and is letting water in faster than it should: usually a WC cistern, a cold water storage tank in the loft, or a feed-and-expansion tank. Replacing the valve is a small job; ignoring it wets a wall all winter.
Also called: overflow pipe dripping outside · water running down outside wall · overflow from loft tank · cistern overflow
Signs you need this
- Water dripping or running from a pipe on an outside wall
- A stained, green or wet patch on brickwork below a pipe
- The sound of a cistern refilling repeatedly
- Water heard trickling in the loft
- Water bills up with no visible leak inside
Overflow pipes exist so that a failed valve dumps water somewhere visible and harmless instead of quietly filling a loft. So when you see one dripping, the system is behaving exactly as designed and telling you to act. Which tank or cistern it comes from is worked out by tracing the pipe back, and by which pipe stops dripping when you isolate something.
Most often it is a WC cistern. The fill valve — a modern diaphragm valve or an older ball-and-arm float valve — has worn and no longer shuts fully, so the level creeps past the overflow. In modern cisterns the overflow discharges internally into the pan rather than outside, which is safer for the building but means a failed valve is silent: it just runs into the drain, day and night, on a metered supply.
Next most often it is the cold water storage tank in the loft on a gravity-fed system, or the small feed-and-expansion tank that serves an open-vented heating system. On the F&E tank, a persistent overflow can also mean the heating system is being pressurised into it — a failed heat exchanger or a circulation problem — and that is worth investigating rather than just changing the valve.
The damage from ignoring it is to the building, not the plumbing. Water running down a wall for weeks saturates brickwork, blows render, feeds mould inside the room behind, and in a cold snap freezes in the joints. On a terrace built hard against the pavement — which describes a lot of Macclesfield's silk-era housing — that same drip lands on a public footway, where it freezes and becomes somebody's slip hazard.
The fix is quick: isolate, replace the valve or its washer, adjust the fill level so it sits below the overflow, and check the float for water inside it. It is worth also fitting a service valve on the feed if there is not one already, so the next replacement takes ten minutes instead of a system drain-down.
What the job covers
- Tracing the overflow back to the tank or cistern responsible
- Replacing failed float valves, diaphragms and washers
- Setting the correct fill level below the overflow
- Fitting service valves so future work needs no drain-down
- Checking the feed-and-expansion tank for signs of a system fault
- Advice on the wall or render where water has been running
What it costs
We don't publish a price for this yet, because a number pulled out of the air is worse than no number at all — your plumber has to honour it. You'll get a firm price for your actual job when they ring you back, before any work starts. The quote itself is free and there's no obligation either way.
Common questions
Is a dripping overflow urgent?
Not an emergency, but it should not be left. It is wasting metered water continuously and soaking part of your building. In freezing weather it also puts ice where people walk.
My toilet does not have an outside overflow — does that mean it cannot fail?
No. Modern cisterns overflow internally into the pan, so a failed valve runs straight into the drain with almost no sound. A faint constant trickle in the pan, or ripples on the water surface, is the sign.
Need this doing in Macclesfield?
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