46 CFR § 72.05-35
Hatch covers and shifting boards
April 15, 2021
(a) Wood hatch covers may be used between cargo spaces. Hatch covers in other locations shall meet the requirements for deck construction noted in tables 72.05-10 (f) and (g).
(b) Tonnage openings in “A” Class bulkheads shall be closed by means of steel plates.