Overlapping prefabricated bed joint reinforcement consisting of two parallel longitudinal wires (that are) joined by a central wire. The central wire forms a truss structure and is welded (soldered) on (in) the same plane along the inner side of the longitudinal wires. It has an innovative design that enables the (performing of the) overlap between reinforcements without the need for any further manipulation, keeping the same nominal width of the reinforcement in the overlap area. The ends of the pieces have a specific geometric plug-shaped configuration which enables the 250mm overlap to be performed without the need to cut the wires. Also, the transverse wire is crushed in said area so that minimum mortar beds can be ensured. It also has spacers on the transverse wires which permit the control of the bed joint thickness. It also includes some devices, called SAO, placed at both ends of the pieces which permit visual verification, after the execution phase, that the amounts of wall reinforcement correspond to those of the design and that the overlap length complies with the regulations.