Flat Roof Electronic Leak Detection – Dynamic Area Mapping (D.A.M.) ©

Earth Leakage Leak Detection
Often referred to as the “wet test”, this method is ideal for use on any flat or low-pitched roof to identify defects in exposed membrane or ballasted systems.This test is performed in wet conditions (rainfall) or with a hosed down wetted test area.

Method
A pulse generator emits pulses with a voltage of 40V which are conducted onto the roof structure via a wire ring circuit. Since all roof membranes are more or less non-conducting, the electrical pulse chooses a path across the moisture to where the leak is located and then flows over the damp roof in all directions to reach the ring circuit.

We can now determine the currents direction of flow and trace it back to its source. This source is exactly the spot where moisture is penetrating the roof membrane.

Video Example
https://www.youtube.com/watch?v=uQPZUCJmO7w

Holiday Detector Test
Often referred to as the “dry test”. This method is ideal for use on any flat or low pitched roof to identify defects in exposed membrane systems allowing for a quicker testing schedule identifying defects such as pinholes and punctures.

This test can only be performed in dry conditions.

Method
The detector delivers, via a phosphor-bronze brush, a stabilised D.C. output voltage across the non conductive waterproofing membrane under test. Detection of defects is by an audible tone and a visual spark from the search electrode (brush).

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