Christophe wrote:ENERC wrote:The priority is to INSULATE.
Yes but on the existing I think that more than 60% of the walls cannot be!
Look at Paris, many neighborhoods are classified ...
Here I took
https://api-site.paris.fr/images/84453.
Old buildings built before 1945 (nearly 60% of the Parisian stock), generally in stone or brick and most often adjoining, most often benefit from good thermal inertia, and display energy consumption between 110 and 230 kWh / m2 / year corresponding to levels C and D of the energy labels
The constructions carried out during the Trente Glorieuses (1945 - 1975), using manufactured materials and industrialized architecture governed by the precepts of modern architecture (buildings in metal or concrete structure, larger glass surfaces, roof terraces), without worrying about 'energy saving, have an energy consumption often close to 350 kWh / m2 / year (levels E and F of the energy labels).
- isolation.png (142.61 KiB) Viewed 3263 times
As a result, Haussmann buildings are hardly affected. It is especially the buildings of the Sixties which are concerned. Some are frankly not beautiful: an external ITE with a change of look of the facade would not hurt.
There is therefore no inevitability in the gas boiler.
But I agree that the ABF (buildings in France) will have to relax their rules: we must get out of "less than 500 m = nan!"