Leak Investigations

Roof Leak Investigations

Our methodical approach and proven track record in leak investigations means we are trusted by principle contractors, latent defect insurers and waterproofing contractors all over the UK to identify and locate the source of water ingress on their projects.

Utilising electronic leak detection, thorough visual inspection, dye testing, pick testing, moisture mapping and thermal imaging we are well equipped to find defects in waterproofing systems.


Upon completion we produce a clear written report showing our methods and outcomes of the leak investigation with recommendations on remedial strategies. Complete with photos, a marked up roof and roof plan you will have the information you need to repair the waterproofing.

What we do in detail

Pinhole, Holiday and Dry Tests

The principle is simple. When the substrate is conductive (i.e. Concrete deck, profile sheet metal deck, or foil faced insulation), the waterproofing membrane acts as an electrical insulant. The Pinhole detector produces a high voltage which is passed through a copper brush over the entire surface of the membrane. Any breaches in the membrane will provide an electronic pathway to earth and thereby ionising the air creating a spark and an audible alert on the machine.  This is then marked on the surface of the waterproofing membrane to facilitate their repair. Photos are taken and reproduced into a report which are sent via email the next working day.


  • Conductive Substrate
  • Non-Conductive membrane
  • Dry Conditions

Dye Test, Flood Test & Rainfall Simulation

Where an electronic leak detection is incompatible or the source of the leak is believed to be coming from somewhere other than the waterproofing membrane, then other techniques can be used to determine the source of the water ingress. A flood test is just as you would suspect, the IntegriTest operative will block the rainwater outlets on the roof and proceed to flood the roof in order to recreate the leak. When it comes to rainfall simulation the IntegriTest operative will determine the most likely sources of water ingress and direct a spray of water (often with different colours of dye) at these locations in order to recreate the leak and thereby confirm the location of the source of water ingress.


  • Water supply
  • Time
  • Assistance from contractor to remove capping/cladding etc, where necessary.

Wet Test and Vector Mapping

Similarly to the dry test the substrate must be conductive for the test to work. However, the area of membrane under-test must remain consistently wet during the test. The test works by producing a electrical field within the test area, using a stainless steel cable and a pulse generator. Utilising the detector poles/unit the IntegriTest operative will detect any disruptions within the generated field. A disruption in the field is caused by an electrical pathway to earth.

Any defects are then marked on the surface of the membrane to facilitate their repair. And photos are taken and reproduced into a report, which will be sent via email the next working day.


  • Conductive Substrate.
  • Non-Conductive membrane
  • Consistently wet under-test area
  • Water Supply

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