1.2

European Directives, National and Regional laws  established minimum standard requirements for renovation works, depending on climate zone (minimum parameters calculated on single building component; energy classification requirements, related to primary energy value for building; implant efficiency requirements; compulsory introduction of renewables):
a. Requirements’ values are constantly more restrictive, because of technology evolution in construction sector. They are not fitted for historic buildings: adapting historic buildings to follow minimum parameters would mean to adopt heavy interventions on the building envelope, which results to be incompatible from theoretical and practical point of view ;
b. Limits and appropriateness of using renewable resources may be discuss for built heritage, especially in historical centre.
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1.3 Guidelines .....

2. Methodology