La. Civ. Code art. 515
Current with operative changes from the 2024 Third Special Legislative Session
When an owner of materials that have been used without his knowledge for the making of a new thing acquires the ownership of that thing, he may demand that, in lieu of the ownership of the new thing, materials of the same species, quantity, weight, measure and quality or their value be delivered to him.
La. C.C. § 515