Paragraph 14
The icing-up allowances which represent the added weight due to ice accretion on the exposed surfaces of the hull, superstructure, deck, deckhouses and companionways shall be calculated as follows:—
full icing allowance:
all exposed horizontal surfaces (decks, house tops, etc.) shall be assumed to carry an ice weight of 30 kilogrammes per square metre.
The projected lateral area of the vessel above the waterline (a silhouette) shall be assumed to carry an ice weight of 15 kilogrammes per square metre.
The height of the centre of gravity shall be calculated according to the heights of the respective areas and in the case of the projected lateral area the effect of sundry booms, rails, wires, etc., which will not have been included in the area calculated shall be taken into account by increasing by 5% the weight due to the lateral area and the moment of this weight by 10%. This allowance shall apply in winter (1st November to 30th April inclusive in the northern hemisphere) to vessels which operate in the following areas:—
the area north of latitude 66°30'N. between longitude 10°W. and the Norwegian Coast;
the area north of latitude 63°N. between longitude 28°W. and 10°W.;
the area north of latitude 45°N. between the North American continent and longitude 28°W.;
all sea areas north of the European, Asian and North American continents east and west of the areas defined in (a), (b) and (c) above;
Bering and Okhotsk seas and Tatar Strait;
South of latitude 60°S.
Half of the full icing allowance:
this shall be taken as one half of that calculated under sub-paragraph (i) of this paragraph and shall apply in winter to vessels which operate in all areas north of latitude 61°N. between longitude 28°W. and the Norwegian coast and south of the areas defined as the lower limit for the full icing allowance between longitude 28°W. and the Norwegian coast.