(1) The height above deck of hatchway coamings
shall be at least 600 mm on exposed parts of the working deck and
at least 300 mm on the superstructure deck.
(2) The finished thickness of wood hatchway covers
shall include an allowance for abrasion due to rough handling. In
any case, the finished thickness of these covers shall be at least
4 mm for each 100 mm of unsupported span subject to a minimum of 40
mm and the width of their bearing surfaces shall be at least 65 mm.
(3) Arrangements for securing wood hatchway covers
weathertight shall be provided to the satisfaction of the Administration.