Seismic upgrades using internal reinforced plasters are an effective solution for extremely vulnerable structures in historic masonry. This technique involves the application of a composite system consisting of a pre-formed mesh inserted in a structural mortar compatible with the existing masonry. The reinforced plaster thus created significantly increases the load-bearing capacity and shear strength of the walls, improving the overall behaviour of the building in the event of an earthquake.

A key advantage of this approach is its compatibility with historical-architectural values, as the intervention is minimally invasive and reversible, and the internal application preserves the building's exterior appearance, a crucial aspect for structures of historical value.