Tel. 02-82455692; Mobile: 0932-8528525 (SUN), 0933-8101162 (SUN), 0998-5718306 (SMART), 0915-9608525 (GLOBE) Waterstops are used as a barrier to prevent the passage of liquid through or across a concrete joint. It is embedded in the concrete on both sides of the joint and spans the joint, designed to accommodate lateral and transverse movement which can cause a joint to open, close, or misalign.