A: Detec’s patented TruGround® Conductive Primer provides the required conductivity for an Electronic Leak Detection test to be valid. TruGround® is to be applied on the substrate located directly below the membrane. Once the TruGround® is dry to the touch, the waterproofing/roofing membrane can be installed. Other materials, such as the vector mapping grid/wire mesh, is typically placed under the coverboard or under the insulation, which produces invalid testing results. To detect breaches, water would have to penetrate a breach and saturate any electrically insulating materials to reach the incorrectly placed wire mesh. ELD requires a conductive substrate directly below the membrane to complete the electrical circuit (ASTM D8231-19). Click here for a technical note on testing conventional roofs using Electronic Leak Detection.
