Civil Code (Cap. 16), article 427

427. (1) The person in whose build ing there are stairs leading to the roof, is bound to raise at his own expense the party-wal l to the extent of one metre and eighty centimetres above the level of the roof. (2) The portion of the wall above the level of the roof must be of the same thickness as the p arty-wall below such level. (3) Where both neighbours have stairs leading to their respective roofs, each of them m ay compel the other to contribu te half the expense necessary for raising the height of the party- wall as aforesaid. Neighbours to avoid causing damage to party- wall.