Waterproofing is a functional layer, a continuous waterproof sheath that prevents the passage of water or moisture into the load-bearing structure. Therefore, it is located on the outside of the structure, where the building is in contact with the ground (soil moisture and water), and where the building has external horizontal surfaces (exposed to the weather), such as platforms, balconies, lodges, terraces and flat roofs.
The task of waterproofing is to provide a dry structure and, consequently, favourable conditions in the interior for various purposes, such as warehousing, labour, production, trade, business activities and living.