Water-penetration testing of the building envelope can help to identify moisture paths through material, specification or construction deficiencies.

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GBG combines various NDE techniques to identify paths of moisture and building deficiencies in the least destructive manner possible. These NDE techniques include RILEM tests, moisture meters, and EC. Most commonly, infrared thermography is combined with targeted spray tests, which minimizes the amount of water and dampness needed to identify a water path. The thermal output of the various surfaces is recorded in high-resolution, still, thermographic images. Water infiltration through a wall or roof tends to cool down the surrounding masonry/concrete sad/ plaster and evaporation leads to further heat loss. Moisture can, therefore, be tracked as cooler thermal responses in a thermal image.