Abstract: An expansion joint assembly for location in a gap defined between first and second structural members, such as sections of a road and/or bridge structure. Failure of the connection between the rail and reinforcing bars of a conventional joint is overcome by integrally forming these components as a single part. Problems relating to physical and/or chemical incompatibility between components of a conventional joint are surmounted by forming all these components from organic polymer resin based materials, which also bestows the inventive joint with improved resistance to potentially harmful environmental conditions. The joint of the present invention is formed by locating an assembly comprised of an elastomeric sealing member and at least one anchor member in a gap defined between two structural members and casting mortar into said gap.