Civil Code (Cap. 16), article 581

581. Where, however, the materials belonging to one of the owners can be considered as th e principal subject, or are far superior in value to the other materials, and the different mat erials cannot be separated, or would, if separated, suffer injury, it shall be lawful for the owner of such mat erials as are reputed to be the principal subject, or are superior in value, to claim the owner ship of the thing created by the commixture, subject to his obligation of paying to the other owner th e value of his materials. Owners of materials may demand sale by auction of new subject of property.