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Business Roof Leak Detection with Dynamic Leak Investigation (DLI®)

We find where the water actually gets in, not just where it shows up. A full photographic report with the repairs you need, ready to hand to a contractor.

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A Ram Building Consultancy technician conducting a Dynamic Leak Investigation on a flat roof using electronic leak detection probes.

Patched Three Times and Still Leaking?

This is how it often happens.

A roofer visits the site, identifies a potential defect above where the leak has appeared, and carries out a repair. The job is signed off, and everyone assumes the problem has been solved.

Then, a few weeks or months later, the leak returns.

The reason is simple: the repair was made to the assumed source of the leak. While that defect almost certainly needed repairing, it may not have been the cause of the water ingress, or it may have been just one of several entry points.

Water rarely travels in a straight line. It can run across roof decks, through insulation, and along structural elements before finally appearing on a ceiling tile or internal wall. By the time you see the leak, the actual point of entry could be several metres away.

Dynamic Leak Investigation (DLI®) removes the guesswork. By recreating the conditions that cause the leak, we can trace water back to its true entry point, identify every defect contributing to the problem, and provide clear, targeted recommendations to resolve it properly.

We Find the True Source of Leaks

A DLI® is a controlled, staged investigation. We work from the lowest point of the roof upwards, eliminating each potential source before we move to the next one.

That order matters. Spray water at a high point first and it runs down to every defect below — you'll get a leak, but you won't know which one caused it. Working upwards means that when we find it, we can say categorically: that's the one.

It's targeted, not a survey of your whole roof. We're there to solve the leak you've got.

RAM Building Consultancy technician conducting a Dynamic Leak Investigation on a flat commercial roof.

Why Building Surveyors and FM Teams Call Us

Close-up of liquid bitumen seeping through a cracked flat roof membrane joint during a Ram Building Consultancy leak investigation.

You Stop Paying for the Same Leak Twice

Repeat repairs cost more than getting it right once. We find the defect that's actually causing the ingress, so the repair works the first time.

Open lift with buckets collecting water below, showing an active roof leak inside a commercial building.

You Get a Report You Can Act On

Photographic evidence, the ingress replicated, and clear remedial recommendations. Our clients hand it straight to their maintenance team or use it as a schedule of works to tender against.

Technician in hi-vis carrying out a Dynamic Leak Investigation on a flat commercial roof using an electrical scanning tool.

Free Initial Technical Consultation

We analyse the available information, provide impartial technical advice, and recommend the most appropriate solution. Our focus is ensuring you receive the right support, not simply selling a service.

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.

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Frequently Asked Questions

What is a Dynamic Leak Investigation (DLI®)?

A controlled test where we recreate the conditions that cause your leak, working from the lowest point of the roof upwards, until we can identify exactly which defect is letting water in. You get a report with photographic evidence and recommended repairs.

What if we can't get onto the roof?

Access is one of the most common holdups. We'll work through the options with you — powered access, traffic management, or in some cases a drone survey to get eyes on it first.

We've had a roofer look at it already. Why would this be different?

A roofer inspects what they can see and repairs where the water appears. We test to find where it gets in. That's why leaks patched by a contractor often come back somewhere else a few months later.

Do you do the repairs?

The report tells you exactly what needs doing. We have contractors on our approved supply list who can carry out the works, or you can use your own.

Will you test my whole roof?

No, and that's deliberate. A DLI® is targeted at the leak you've got. If you need a full picture of the roof's condition, that's a roof condition survey and we can do that too.

How long does it take?

Most investigations are completed in one visit. Some take longer if there are multiple leaks or the roof is large or difficult to access. We'll give you a clear estimate before we start.

Why does it take a full day to find one leak?

Because we eliminate rather than guess. Each stage has to be ruled out before we move up, otherwise water from a higher test runs down to lower defects and we can't tell you which one caused the problem. It's slower, and it's why we can be certain.

Do you cover the whole of the UK?

Yes. We work nationwide from our base in Bedford.

How quickly can you get to us?

We move as fast as we can. For new clients there's a short onboarding process including a credit check, so it's worth starting that conversation early if the leak is active.

Still Chasing the Same Leak?

Send us what you know: where it's appearing, what the roof's made of, what you've already tried. We'll tell you whether a DLI® is the right test and what it'll take.

No charge for the conversation.