Artikel 64

(1) The hull, superstructure, structural bulkheads, decks and deckhouse shall be constructed of steel or other equivalent material except as otherwise specified in paragraph (4).
(2) The insulation of aluminium alloy components of “A” or “B” Class divisions, except structures which, in the opinion of the Administration, are non-load-bearing, shall be such that the temperature of the structural core does not rise more than 200 degrees celsius above the ambient temperature at any time during the applicable fire exposure to the standard fire test.
(3) Special attention shall be given to the insulation of aluminium alloy components of columns, stanchions and other structural members required to support survival craft stowage, launching and embarkation areas, and “A” and “B” Class divisions, to ensure: (a) that for such members supporting survival craft areas and “A” Class divisions the temperature rise limitation specified in paragraph (2) shall apply at the end of one hour; and
(b) that for such members required to support “B” Class divisions, the temperature rise limitation specified in paragraph (2) shall apply at the end of one half-hour.
(a) that for such members supporting survival craft areas and “A” Class divisions the temperature rise limitation specified in paragraph (2) shall apply at the end of one hour; and
(b) that for such members required to support “B” Class divisions, the temperature rise limitation specified in paragraph (2) shall apply at the end of one half-hour.
(4) Crowns and casings of machinery spaces of Category A shall be of steel construction adequately insulated and any openings therein shall be suitably arranged and protected to prevent the spread of fire.