Proposed standard ASTM WK27666, Practice for Electrical Conductance Methods for Locating Leaks in Exposed or Covered Waterproof Membranes, will be used to ensure that waterproofing of buildings is performing as intended. Standard is applicable for membranes made of materials such as polyethylene, polypropylene, polyvinyl chloride, and bituminous materials. Once approved, practice will be useful to architects, specifiers, manufacturers, roofing contractors, warranty providers, and building owners.