Chapter 21: Bridge accessories

This chapter considers parapets, expansion joints, waterproofing and drainage. Parapet containment levels, working width classes and impact severity levels are tabulated, and a risk assessment approach to containment is outlined. Parapet materials are described, as well as design considerations. The common types of expansion joint are described, together with the design approach, drainage measures, detailing and best practices. A brief description of varied types of bridge deck waterproofing is presented, with descriptions of detailing, installation and maintenance.