Section 7(2) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(2)The upper side of every such deck shall be sheathed with wood or with a material which complies with the requirements specified in the Second Schedule. Such sheathing shall be properly laid and, if it consists of wood, shall be properly caulked.The Central Government may exempt and ship from the requirements of this sub-rule to the extent that it is satisfied that the undersides of the overhead decks are insulated with a material (other than wood) which complies with the requirements specified in the Third Schedules, and which is so fitted as to avoid as far as possible absorption of water, condensation, transmission of noise and harbouring of dirt and vermin.
