At Holloway Cook Associates we provide an Electronic Leak Detection Testing service, which is used to identify defects in flat roofing membranes, especially when the defects are difficult to identify visually, such as small punctures.
The Electronic Leak Detection Tester sends out a high voltage from a battery unit via a phospor bronze brush which is passed over the membrane by the operator. Attached to the battery is an earth lead which is connected to the building structure.
On a flat roof without faults the membrane acts as an insulator restricting the flow of current. When the brush is passed over a fault, the current passes through the defect in the membrane via the moisture in the system. This flow of current sounds an alarm to inform the operator and the current trips off instantaneously. The defect is then marked out on the roof so that pin point repairs can be undertaken.