Here is the second part of the conservative restoration of monumental staircase by Mauro Codussi at the Scuola Grande San Giovanni Evangelista consisting of the consolidation of the central vault extrados. Releasing the vault on the staircase summit from the floor and from the base, the numerous cracks that put in danger the structure were visible. UNISVE refurbished the structural continuity of the vault, using mahogany wedges and a blend of lime and checked aggregates in order to reinforce the cracks. Finally the vault was strengthen applying aramid fibers and epoxy resins on the perimeter of the extrados. Finally, the terracotta surface was protected from the directed contact with the epoxy resin by drafting acrylic resin.