Abstract: A brace provides lateral support to a series of upright truss units of a truss system having at least first, second and third truss units, with each truss unit having at least one beam member having a first surface, that is generally co-planar with corresponding beam members of other truss units. The brace includes a generally continuous, elongated central leg having a first surface, a second surface positioned for engaging a first surface of the beam members of the first, second and third truss units, and a longitudinally extending rib member. The rib member is unitarilly formed with the central leg and extends generally outwardly from the second side surface of the central leg and includes a first opening for receiving the first truss unit, a second unit for receiving the second truss unit, and a third opening for receiving the third truss unit.