RAM CONSULTANCY LTD
ELECTRONIC LEAK DETECTION (ELD)

If a roofs waterproof membrane is continuous, it may act as an electrical insulator of an electrically conductive substrate below (some membranes such as EPDM are electrical conductors and this technique cannot be used). However, if any defect in the membrane (leak position) exists this will allow a pathway for an electrical current to be discharged to earth. The test equipment introduces a stabilised direct current (d.c) over the dry roof membrane. By moving over the dry waterproof membrane with the portable test instrument an experienced technician can pinpoint defects that will allow water to enter into the roof construction.

Technician using the dry tester.	Defect identified by the dry tester.

Electrical Earth Leakage Testing - 'Wet' Method

If a roofs waterproof membrane is continuous, it may act as an electrical insulator (some membranes such as EPDM are electrical conductors and this technique cannot be used). However, if any leak positions exist, water that has seeped into it will act as a partial conductor for any electrical current to flow to the deck and from there to earth. The test equipment introduces an electrical pulse over the wet roof membrane. By measuring the potential difference of the roof surface, an experienced technician can pinpoint the leaks by tracking any current flow.

Technician using the wet tester.	Defect identified by the wet tester.

Once the electronic testing has been completed a detailed report will be issued containing the test methods used, number of defects identified, possible cause of defects, any observations relevant to the survey e.g. following trades and recommendations to rectify the defects or prevent any further damage to the waterproofing membrane.

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