Underground Buildings

The roofs of underground buildings are considered waterproofing applications because they are usually buried under some amount of insulation, drainage systems and soil or other topping. As such, waterproofing materials, systems and details are used instead of typical roofing details. This is due to the unknown direction of water travel. Once a structure is underground, water may seep from above or be driven by water pressure upward towards the ground surface. Special flashings and other procedures are necessary to produce a successful waterproofing project.