Joints are typically placed at each end of the span or for bridges built in the last 40 years, at the ends of bridge units to accommodate bridge movements related to temperature change. A sealed joint creates a barrier which keeps the joints clean and free of debris to allow for the needed movement, protects the beam ends and bent caps from deterioration related to deicing salt use and other contaminants and prevent debris build up accumulating around the bearings which is also problematic. Maintaining bridge joint seals is the most beneficial activity to prolong the life of the bridge.

When there is damage to a steel expansion joint system, removal of loose steel joint members is recommended. Typically, removing the loose steel pieces will not create large openings in the roadway, except in the case of finger joints. If finger joint plates come loose, contact the Bridge Division for support. Never weld additional steel members across an open expansion joint. Bridging an open joint with welded steel members will cause additional damage to what may not be damaged.