International Leak Detection - Waterproofing Membrane Defects, Waterproofing Defects, Leak Detection Systems & Advanced Waterproofing Services International Leak Detection is your troubleshooting authority for waterproofing membrane defects. Serving clients worldwide, certified inspectors perform non-destructive integrity tests on new or existing waterproofing membranes and containment liners using pinpoint-accurate Electric Field Vector Mapping (EFVM ®) technology. This rigorous technology, combined with our multilateral services, provides accurite detection of waterproofing defects and breaches.