The paper illustrates the design and execution of seismic retrofit of a building with reinforced concrete structure, through the use of metal braces with integrated viscous damper. The work is part of a larger project that also included works by expanding the classroom through the use of stilts, closed with drywall that do not interfere in the structural behavior of the building. The economy and the possibility of working without closing the buibing, are its salient features. The cost of structural works was in fact of 190,000 € plus VAT and charges, amounting to less than 170€/sqm. A sum much less than the cost of traditional interventions (400€/sqm).
