A construction waterbar is a type of waterstop, a flexible barrier installed in concrete joints to create a watertight seal and prevent water leakage. Made from materials like PVC, rubber, or hydrophilic compounds, they are embedded across construction and expansion joints in structures like foundations, tunnels, and reservoirs, where watertightness is critical. Waterbars accommodate movement from temperature changes or structural loads, ensuring the long-term integrity of the structure