Development of underground space is one of evolution trends of present day metropolises, suffering from the deficit of city territories, population growth and an increase of traffic flow. Underground parking, stations, stores have become an everyday occurrence for many cities in the world. Underground structures are under continuous influence of subsurface water and aggressive environment. LOGICBASE is a homogenous unreinforced multi-layer waterproofing membrane based on high-quality PVC-P and TPO. It is used for waterproofing, tunnels, basements of buildings and structures.