SK Likproof is leading waterproofing contractors with liquid membrane, app membrane. A waterproofing membrane is a thin layer of water-tight material that is laid over a surface. The materials are used in a system to prevent the ingress of water into foundations, roofs, walls, basements, buildings, and structures when properly installed. Depending on the structure and need, the waterproofing membrane can either be applied to the interior (negative), such as the case with repairs, the exterior (positive).For example, on a flat terrace; a waterproofing membrane could be laid above the structural slab and below the finish tiles.