ABSTRACT
Although the current regulation in France requires minimal insulation when retrofitting existing buildings (Decree n° 2007-363 19 march 2007), those ancient buildings with massive walls remain exempted as their hygrothermal behavior wasn’t known well enough when the law was adopted. Even so, it is a frequent concern for inhabitants and owners of old buildings: recurrent national and local awareness campaigns are stressing the need of insulating homes to save energy. These campaigns also promote global approach for the insulation process, when financial backing programs allow both global and step by step implementations.
