An expansion joint is a link designed to hold parts together while safely absorbing temperature caused enlargement and shrinking of building materials and vibration, or to allow movement due to ground settlement or seismic activity. Expansion joints are available in many different shapes and materials. We offer Single Arch, Double Arch, Rubber, Fabric, High Pressure, Bellow Covers, High Temperature, Rubber Bellows Expansion Joints. Expansion joints are an essential part of concrete structures. They are constructed into deck systems to guide the pressure of volume changes in concrete. Expansion joints soak vibration and permit movement caused by earthquakes and ground settlement. Before the concrete is poured expansion joints are put in place. 8 to 12 feet is the most expansion joint can be put apart. Expansion joints are a significant component of any strong concrete, steel structure and bridge decks in particular, as they soak up these movements, while also helping shrinkage, creep effects and temperature changes experienced by the structure. An expansion joint is the most pressured element in many engineering structures.