36.—(1) All reasonable and practicable measures shall be taken to limit the entry and spread of water above the bulkhead deck. The sill of entrances to any underdeck space shall be at least 300 millimeters high.
(2) The bulkhead deck or a deck above it shall be weathertight. All openings in the exposed weather deck shall have coamings of at least 300 millimeters high and of ample strength and shall be provided with efficient means for expeditiously closing them weathertight. Freeing ports, open rails and/or scuppers shall be fitted as necessary for clearing rapidly the weather deck of water under all weather conditions.
(3) Means for closing openings in the shell plating above the margin line shall be of efficient design and construction and of sufficient strength having regard to the spaces in which they are fitted and their positions relative to the deepest subdivision load line.
(4) Efficient inside deadlights, arranged so that they can be easily and effectively closed and secured watertight, shall be provided for all sidescuttles to spaces below the first deck above the bulkhead deck.