It has been noted in several field condition surveys that a large percentage of expansion joint failures have been the result of the premature breakdown of the transition or end dam areas. This has been attributed to the materials typically used in these areas being non-energy absorbing and brittle in composition. The failures of these materials have resulted in the development of a new compound known as elastomeric concrete which is helping expansion joints to remain watertight and, thus, extending the life of our nation's bridges. The first expansion joints in Canada utilizing elastomeric concrete end dams were installed in 1979. Since the initial installations, thousands of linear feet of elastomeric concrete headers have been installed on bridges all over the country. A decade later, this paper looks back at some of these installations and how they have performed after years of traffic impact loading and environmental extremes. Elastomeric concrete consists of a flexible binder material which is mixed with sand and aggregate. The resultant mix is placed in the expansion joint transition area and is typically heat-cured to form a durable resilient impact absorbent end dam which also anchors the expansion joint system in place. The paper also explores the various types of elastomeric concrete systems currently available and their differences in application and performance. The installation procedure of elastomeric concrete has proven to be the major factor in the success or failure of the expansion joint system. Numerous methods have been employed over the past decade in an effort to simplify and expedite the installation process. A review of these methods along with the equipment employed is undertaken in an effort to help the specifier determine which system offers the best possible results. In conclusion, elastomeric concrete has now been successfully installed on structures in nearly all the provinces as well as numerous projects abroad. Some of the successful installations are compared to projects where problems have developed to determine what precautions can be taken to prevent future concerns. Standard generic specifications have been developed which help ensure that the specifier can obtain a high quality elastomeric concrete. A review of these material requirements is also presented. For the covering abstract of the Conference see IRRD Abstract no. 807839.