Watertight expansion joint

A waterproof expansion joint sealing section for the gap between adjacent floor surfaces of a structure comprising an elastic bridging member having longitudinally directed edges, an anchoring bracket having a vertical leg and a horizontal leg extending essentially parallel to the floor, means securing said horizontal leg of each of said brackets to an associated floor surface on each side of the gap therebetween, an intermediate member secured to each of said vertical legs and rising therefrom, an elastic covering strip disposed parallel to the length of the gap, each of said longitudinal edges of the elastic bridging member being disposed in overlapping relation to a longitudinal edge of said covering strip, a retaining strip extending over said two overlapping longitudinal edges, means co-acting with said intermediate member to maintain said retaining strip in compression relative to said overlapping edges against said intermediate member to provide a watertight connection.