The environmental balance as decision support to the refurbishment detailed design

The refurbishment design is a well-known strategy to mitigate environmental impacts of the built heritage, but it is not environmentally neutral. A deep knowledge of the building is required in order to maintain the greatest amount of materials - depending on its residual technological performances - and thus containing the consumption of new resources and the production of demolition wastes. Following up existing tools, a method to analyse environmental impacts and support the design at the executive level is presented. Possible intervention ahternatives are evaluated from a life cycle perspective, through the embodied energy and CO2 equ indicators, aiming at re-using as much material as possible and preferring new materials with low environmental impact.