Sustainable technologies in the refurbishment of existing building envelopes in Italy

With the new European Energy efficiency regulation building are forced to respect restricted standards for energy saving. In the last ten years building envelope has become more important in the overall energy balance, as a dynamic surface able to optimize its performance in relation to different climatic inputs (passive or active). In this sense it will be desirable to manage the necessaries refurbishment actions in the direction of the passive solar gaining, natural cooling and other relevant sustainable technologies for building envelopes which are presented in this paper.