Waterproofing

The state-of-the-art waterproofing system consists of, exposed waterproofing sheet for all types of tunnels and underground works, whether new or to be refurbished, without the need for any subsequent covering. The exposed sheet is composed of several layers. The exposed outer layerprovides mechanical strength; the middle layer consists of closed-cell foam that provides the desired level of thermal insulation; and the inner layer provides mechanical strength, drainage, a weldable surface and a vapor barrier.The exposed sheet provides waterproofing, drainage capacity, water channelling and anti-freeze thermal insulation. With more than 20 years and 2 million sqm installed in countries such as Switzerland, Norway, Spain, Italy, France, Colombia, Chile and Ethiopia, among others.