Fixing a leak under the green roof is relatively easy. Finding it is the hard part.

Surprisingly, leaks in the waterproofing layer are less likely when it is protected from the elements by a green roof. If a leak does occur, it can readily be located through new electronic technology, such as electric field vector mapping (EFVM), which can rapidly and accurately pinpoint even minute holes.

While Good Earth Plants implements flood testing prior to the installation of plants and growing media, the addition of an EFVM system is convenient, need not be installed in advance, and can even be used on steeply-sloped surfaces. Repairs to the waterproofing are quick, and disturbance of the green roof is minimal.