An Electronic Leak Detector (ELD) is used for locating pinholes, porosity and other faults in new or existing non- conductive membranes and coatings on conductive substrates.
The ELD works on the principle of passing a current over the roof surface through a copper brush electrode so that, when a path to earth is found, such as through a puncture or defective lap, an alert is sounded. All defects are marked, numbered and their locations shown on a plan for patch repairs to be made and then re-tested.
On new roofs, such testing is a robust method of quality control to show that the roof is free of defects on completion.