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André Poupard, a masonry and plastering trainer, specializing in organic and geosourced constructions, gives us his testimony on the use of concrete and lime-hemp coating in building construction. His testimony was collected as part of a Cordée de la Réussite action of the Campus des Métiers et des Qualifications d'Excellence Digital and ecological transition of construction, Île-de-France within the CFA BTP d'Ocquerre.