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Electronic Leak Detection (ELD) for Commercial Flat Roofs

Non-destructive testing that finds breaches in your waterproofing membrane, including pinholes a visual inspection will never pick up. Nationwide coverage, RICS regulated.

2025 in
Numbers...
42
Drone Surveys Conducted
658
Leaks Detected
432
ELDs completed
A roof being inspected

Patched Four Times and Still Leaking?

Most flat roof leaks get treated, not fixed. A contractor does a visual inspection, spots the obvious damage, and applies a repair. It stops leaking. Three months later it's coming through somewhere else, because the actual breach was never found — the water just took a different route.

We see buildings that have been patched three or four times before anyone calls us. By then the insulation is saturated, the deck is at risk, and the cost of getting it right has doubled.

Electronic Leak Detection tests the integrity of the waterproofing itself. It finds breaches down to pinhole size, without cutting into the roof. You get evidence of exactly where the membrane has failed, and what needs doing about it.

Non-Invasive Testing for Precise Roof Leak Location

At RAM, we use the latest ELD technology to ensure your roof or membrane systems are watertight and functioning properly. Our expertise lets us quickly locate and address leaks before they cause major issues. By using ELD, RAM keeps your building protected from water ingress, reducing long-term costs and preventing potential structural damage.

What an ELD Survey Gives You

Breaches Located and Mapped

We test the membrane across the agreed area and mark every breach we find, down to pinhole size. You get exact locations, not an approximate zone.

A Report You Can Actually Use

Photographic evidence of every defect, our test methodology, and clear remedial recommendations. Clients use our reports as schedules of work for their maintenance teams, or as specifications to tender contractors against.

No Damage to Your Roof

Nothing is cut, drilled, or removed. The test is non-destructive, so your warranty stays intact and there's no disruption to the building below.

RICS Regulated

RICS is an independent professional body originally established in the UK by Royal Charter. You can take confidence from the mark ‘Regulated by RICS’ as an assurance of quality. RICS is the world’s leading qualification when it comes to professional standards in land, property and construction.

RICS

Dominos
Nestle
JLL
NHS
Westfield
TFT

How an ELD Survey Works

Free Assessment

Tell us what's happening. We'll come to site or jump on a call, free of charge, to understand the problem and check roof access. Sometimes what you think is the issue isn't the issue — it's worth finding that out before you commit to anything.

Fixed-Fee Proposal

You get a clear scope and a fixed price. No day rates that creep, no surprises.

On-Site Testing

Our engineers test the agreed area and mark every breach. Most surveys are completed in a single visit.

Report and Recommendations

Full photographic report within [CONFIRM] working days, with remedial recommendations you can act on immediately.

Frequently Asked Questions

What is Electronic Leak Detection?

ELD is a non-destructive test that uses electrical current to find breaches in a waterproofing membrane. A charge is applied across the membrane surface and any break in it, including pinholes too small to see, shows up as a path for the current to earth. It is used on flat roofs, green roofs, balconies, terraces and podium decks.

Does ELD test my whole roof?

It tests the area we agree in the proposal. That might be the full roof or a defined section, depending on what you need and what your budget allows. We will be clear about the scope before we start, and clear about what falls outside it.

What is the difference between ELD and Dynamic Leak Investigation?

ELD checks whether the membrane is intact. Dynamic Leak Investigation traces where water is actually getting into the building. If you are verifying a new roof or checking one before a warranty runs out, you want ELD. If water is coming in right now and you need to know why, you want Dynamic Leak Investigation. We will advise which fits during the free assessment.

How much does an ELD survey cost?

Surveys start from £[CONFIRM]. Price depends on roof area, access and whether other testing is needed alongside it. You get a fixed-fee proposal before any work is booked.

How quickly can you get to site?

[CONFIRM]. New clients go through a short onboarding and credit check first, which typically adds a few days. If you are likely to need us at some point, it is worth getting that out of the way in advance.

Do you work across the whole UK?

Yes. We are based in Bedford and work nationwide, including London, the Midlands and the North. Travel is included in the proposal, so there are no add-ons afterwards.

Not Sure What You Need? Let's Take a Look.

Book a free assessment. We'll come to site or set up a call, look at what's happening, and tell you which test will answer your question — even if that turns out to be no test at all.

No obligation, no charge, and no sales pitch.