Flat Roof Leak Detection​

– Wet Roof detection

The Wet Roof Pro’ has been designed to locate leaks on flat roofing systems which incorporate dielectric membrane overlays such as single-ply, asphalt, bitumen and liquid applied roofs. The Wet Roof Pro.


Leaks in the roof membrane allow water to penetrate to the building’s structure; creating a short circuit. Detector unit is connected to two hand-held test probes which are held in contact with the roof surface.

Wet Roof Detector

Typical flat roof types

Concrete roof deck

Concrete retains a surprisingly high water content. Even when concrete is ‘dry’, this ambient moisture content is enough to conduct current and test for leaks. Flaws in the membrane allow the detector to complete an electrical circuit to earth via the concrete and trigger the detector’s alarm.

STEEL roof deck

The steel structure below the roof membrane – as well as foil-faced slab insulation – conducts electrical current to earth. Faults in the membrane provide a path for current to pass through and complete an electrical circuit, triggering the alarm.

Timber roof deck

Whilst the timber structure of the roof itself is non-conductive; foil-faced insulation and water which has ‘tracked’ to earth through leaks will provide enough conductivity to test with the Dry Roof Pro’ or the Wet Roof Pro’. Many timber-deck roofs with foil-faced insulation have additional earth bonding to the insulation to aid the leak detection process.

Timber roof deck

Emergency Contact

Our Flood and Water Damage Repair Specialists are based in Kent, South East of the UK and work across Southern UK from Kent to London to Surrey, Sussex and Essex.

24hrs Emergency Line
7 days a week

0800 5999 009


Fast response, very friendly, working fast and efficient and professionally. Would use again and recommend.

Customer in Barnet

– DRY Roof detection

The Dry Roof Pro’ provides a rapid method of testing a wide range of roofing membrane types and thicknesses of between 64µ and 25.6mm. The kit contains everything required to start testing immediately (even batteries and charger), all contained in a robust, high-visibility transit case.

The Dry Roof Pro’ utilises the non-conductive properties of roof membranes as an electrical insulator.

As the detector passes a defect in the membrane, the current required to complete an electrical circuit reduces due to the lower dielectric strength of the membrane. As an electrical circuit is created..

The Dry Roof Pro Detection

Head Office

Humidity Response Ltd
Unit 21
Bircholt Road
Parkwood Industrial Estate
ME15 9GQ

Calls may be recorded for training purposes

Supporters of

h4h logo

Most of the work we do on your behalf will be covered by your insurer.
To support your claim we document the whole process to enable your claim
to be met by your insurer.
We produce a written quotation and document what we do from start to finish.
This includes photographs at the start, during the work and on completion.
When dealing with flood related issues moisture surveys are carried out during
the whole process so your insurer can monitor how quickly the property is
being dried or in some cases like listed properties not to quick.
The ultimate aim of any drying project is to issue the Certification of Dryness,
we offer the full range of structural drying, compliant with IICRC S500 standards.
Certification of Dryness for Building Insurance.
Our team work very closely
with the British Damage Management Association and are Accredited
Corporate Members of the BDMA
Many of the Insurance Loss Adjusters also hold certification from the BDMA
which has the huge advantage of all parties involved in a claim are
working to the same guidelines.

• 24/7 call out
• We have over 50 years combined experience
• Fully trained staff
• Insurance claim experts

We deploy the latest humidity technology combined with innovative
equipment to get your property back to normality as possible.
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