How Electronic Leak Detection Finds Hidden Roof Leaks
Some leaks are obvious. Others are maddening: damp keeps appearing inside, but there’s no visible damage on the roof and no amount of poking around finds the source. That’s exactly where electronic leak detection earns its place. Here’s how it works in plain English, and why it’s such a useful tool on Doncaster’s flat roofs.
Why leaks are so hard to find
Water doesn’t travel in a straight line. It enters through a tiny breach, runs along the deck and under the insulation, then drips through somewhere else entirely. By the time it stains a ceiling, it can be metres from the actual fault. Tearing up a roof to “have a look” is disruptive, costly and often misses the real breach.
It’s harder still on systems with lots of potential failure points. An EPDM roof can have water creeping under a perished adhesive seam; a GRP roof can be weeping through a hairline crack you’d never spot by eye. Both can leave you chasing a phantom.
What electronic leak detection is
Electronic leak detection (ELD) is a non-destructive way of finding the exact point where a membrane has been breached. Because a sound waterproofing membrane is an electrical insulator, the equipment can use that property to locate the one spot where water is bridging through to the deck, without cutting the roof open.
How it works
There are two common methods, and we choose the one that suits the roof:
- Low-voltage (wet) testing. The roof surface is wetted and a low electrical current traces where water is bridging through a breach to the deck below. It’s well suited to roofs in use and to flooded testing of a defined area.
- High-voltage (dry) testing. A probe is swept over a dry membrane and signals the moment it finds a pinhole or breach. This is ideal for checking a newly laid roof or a specific area.
Either way, the result is a breach located to within centimetres, marked precisely so the repair is targeted.
Why it’s worth it
- No needless damage. We find the fault without ripping up sound roofing.
- A repair that lasts. Fixing the actual breach, not the nearest stain, stops the leak coming back.
- A full written report. Every fault is photographed and located, useful for your records, warranty or insurer.
- Proof of integrity. ELD can confirm a roof is watertight, valuable on commercial buildings and after a repair. It’s a neat way to prove a welded single ply roof has been sealed correctly.
Tracing leaks across Doncaster and South Yorkshire
If you’ve got a leak you just can’t pin down, this is often the answer. Read more about our electronic leak detection service, or our guide to why flat roofs leak. Once located, we carry out a lasting repair on roofs throughout Doncaster, Rotherham, Barnsley and the surrounding towns.
Chasing a leak with no obvious source? Get in touch or call 07973 436 305.
Frequently asked questions
What is electronic leak detection?
It is a non-destructive way of finding the exact point where a waterproofing membrane has been breached. Because a sound membrane is an electrical insulator, the equipment uses that property to locate the one spot where water is getting through, without cutting the roof open.
Is electronic leak detection accurate?
Yes. It locates a breach to within centimetres and marks it precisely, so the repair is targeted at the actual fault rather than the nearest damp patch. You also receive a written report with every fault photographed and located.
Does it work on EPDM and GRP roofs as well as single ply?
Yes. It is especially useful on systems prone to many small failure points, such as the adhesive seams of EPDM or the hairline cracks in GRP. It can also confirm that a newly laid or repaired single ply roof is watertight.
Do you offer electronic leak detection in Doncaster?
Yes. We provide electronic leak detection across Doncaster, Rotherham, Barnsley and the surrounding South Yorkshire area, then carry out a lasting repair once the breach is located.