This method is ideal for use on any flat or low-pitched roof to identify defects in exposed membranes or ballasted systems without the need to remove ballast. This test is performed in wet conditions (rainfall) or with a hosed down wetted test area.
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 current’s direction of flow and trace it back to its source. This source is exactly the spot where moisture is penetrating the roof membrane.
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
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).