Civil Code (Cap. 16), article 411

411. (1) The repairs to a common wall or its reconstruction shall be at the charge of all those who have a right thereto in proportion to th e right of each. (2) Nevertheless, every co-owner of a wall may relieve himself of the obligation of contributin g to the expense of the repairs to the said wall or of its reconstruction by waiving his right of co- ownership, provided the common wall does not support a building belonging to him. (3) Such waiver, where competen t, shall not relieve the party making it of his liability for such repairs or reconstruction a s may have been occasioned by him. Where common wall supports building which owner wishes to demolish.