Electronic Leak Detection in British Columbia

Electronic leak detection (ELD), also known as low-voltage electrical field vector mapping, is a specialized technique for locating breaches in waterproofing membranes, roofing systems, and below-grade structures. The principle is simple but powerful: a low-voltage electrical current is applied across the waterproof membrane, and a technician uses a sensitive probe to detect where the current flows through breaches in the membrane to complete the circuit through the underlying conductive substrate. This method can detect even microscopic pinholes that would be invisible to the naked eye and too small for other detection methods.

At LeakInspection.ca, we offer electronic leak detection for several critical applications in BC. For flat roof membranes — including EPDM, TPO, PVC, and modified bitumen — ELD can quickly survey the entire roof surface and identify every breach, including those at flashings, penetrations, and seams. This is particularly valuable for warranty inspections, pre-commissioning verification of new roofs, and troubleshooting chronic leaks that have resisted other detection methods. For below-grade waterproofing, we test the integrity of foundation waterproofing membranes, green roof assemblies, planter waterproofing, podium decks, and plaza membranes before they are covered with soil, paving, or landscaping.

ELD testing is typically conducted under dry surface conditions, as standing water can create false readings. The process involves placing electrodes on both sides of the membrane — one on the exposed surface and one in contact with the conductive substrate below. A low-voltage DC current is applied, and the technician scans the surface with a probe that detects electrical flow at breach points. Modern ELD equipment can also be used for wet membrane testing in some configurations, where the technician uses a conductive foam roller or water wand to apply current across the surface. The results are immediate and precise, with breach locations marked on the membrane for repair. We serve roofing contractors, waterproofing applicators, building envelope consultants, and property owners who need definitive membrane integrity verification.