Abstract: In this paper, we present a proposal for a retrofit system for existing reinforced-concrete (RC) buildings consisting in the use of precast concrete panels, designed for improving both the structural and energetic performance. In particular, the proposed system is conceived to improve both the energetic efficiency, by ensuring high-performance thermal insulation, and the capacity of the structural elements under gravity and seismic loads. Firstly, a detailed description of the proposed technology is provided, which has been tested and assessed on a realscale prototype. Then, the efficiency of the technique was explored by means of numerical simulations for both the energetic and structural performance. Although no experimental tests are available, the results of our numerical simulations and analyses on a real case-study building reveal interesting insights, highlighting the main pros and cons of the proposal and providing a possible retrofit solution for uildings that do not meet the current European code requirements

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