Abstract: Bracing apparatus for supporting vertically disposed structures, in particular wall constructions, prior to their connection with other components of a construction system. The apparatus includes an anchoring member, secured to a lower portion of the wall to be supported, through which a stay member, e.g., cable, is guided and each end of the cable is connected to distal end portions of a diagonal member. The anchoring member is first secured to the wall and the cable is threaded through a guide portion of the anchoring member. The diagonal member is then placed so that one end contacts the wall and the other end is supported by the surface adjacent to the wall. Each end of the cable is then attached to end portions of the diagonal member and tension applied to the cable by means of a turnbuckle or winch so that compressive forces are simultaneously exerted against the wall and the adjacent surface.