stone wall 50 cm
I recommend Reading these two articles published by a local association Were-Briez:
http://www.tiez-breiz.org/enduits.htm
http://www.tiez-breiz.org/isolation.htm
Conclusion:
No interior insulation, brakes just vapor
A medium term, the insulation ext UPPER see photos from the book of reference JP Olivia
must first remove the cement plaster on the facade.
=> To not spoil, Ca significantly reduced the budget and remains on healthy materials
Good news: There is no regulation on heat of old buildings (not concrete). We will therefore not be forced to isolate from the inside. Energence told me that he is more and more of easy to obtain agreements to insulate from the outside even when facing the street
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