The static situation of the monumental staircase has been a source of concern since the early years of the twentieth century due to a progressive overhanging of the external walls. These problems, despite the numerous interventions that have taken place over time, had not yet been solved: cracks were evident in the structure of the vault and the central floor with cracks along all the flights of the stairs.
Before proceeding with the consolidation works on the extrados of the central vault of the staircase, the tiles that make up the floor of the landing were numbered, mapped, removed, cleaned, washed and brushed to eliminate the residues of the old bedding mortars. At the end of the consolidation works, the vault was filled again following the historical stratification and its original materials, finally the tiles were repositioned as per the initial mapping.
The video shows the mapping of the slabs of the landing and the unveiling of the extrados of the vault.