Article 656 of the French Civil Code

However, any co-owner of a party wall may be exempted from contributing to repairs and rebuilding by waiving the right of party ownership, provided that the party wall does not support a building belonging to him.

Original in French 🇫🇷

Article 656

Cependant tout copropriétaire d’un mur mitoyen peut se dispenser de contribuer aux réparations et reconstructions en abandonnant le droit de mitoyenneté, pourvu que le mur mitoyen ne soutienne pas un bâtiment qui lui appartienne.