Joint waterproofing and sealing are essential in areas where concrete casting stops, as well as at all points where different structural elements meet — such as expansion joints, concrete connections, frames, roofs, and underground structures. For the effective protection of these areas, specialized waterproofing materials are used, such as bentonite waterstops, bituminous and polyurethane sealants, silicones, and polyurethane foams. These materials provide elasticity, resistance to movement, and complete watertightness, effectively preventing the penetration of water and moisture.