Cementitious waterproofing system is a type of waterproofing solution that uses a mixture of cement, sand, and other additives to create a waterproof barrier. This type of system is typically applied in a thin layer to the surface of a structure, such as a basement or retaining wall, to prevent water from penetrating the building envelope. The mixture is applied as a slurry and allowed to cure, forming a durable, waterproof layer that can last for many years.