An expansion joint, sometimes called a movement joint, ensures the complete waterproofing of the junction between two elements of roofing, walls, foundations, parking decks and other civil engineering works.
Therefore, its flexibility allows to absorb variations in material dimensions as well as the movements of the upper part of the building in reaction to ground movements in order to reduce deformations and to protect the structure.
The expansion joint allows movement in all three (3) axes (horizontal, vertical and shear) synchronously.