What is an Expansion Joint Covers(EJC)?

An expansion joint is an opening within a structure, at predetermined locations, designed to absorb Movement of the structure. 

Movement may be defined as follows:

1. Thermal - caused by temperature changes within the structure. Thermal movement is horizontal.

2. Seismic - caused by earthquake activity beneath the structure. Seismic movement may be horizontal, vertical or shear; or a combination of all three.

3. Windload induced - caused by high winds forcing the structure to sway. Windload induced movement is normally horizontal or shear.