Page 262 - Rules of Navigation2020

Measurement of Deck Spaces:
A- Vessels with one tier of superstructures only:

(1) Poop, bridge, forecastle:
(1)
The following exemptions are allowed under certain conditions:
a) Such length of the poop measured from the inside of the stern timber, at half height of
Th
the said poop, shall be equal to 1/10 of the full length of the ship.
b) The portion of the bridge in way of the light and air spaces of the engine and boiler
spaces is being understood that such light and air spaces are not considered to extend

beyond the forward bulkhead of the stoke-hold and the after bulkhead of the main
engine-room.
c) Such length of the forecastle measured from the inside of the stern at half height of the

th
said forecastle, shall be equal to 1/8 of the full length of the ship.
d) In each of the above three cases of superstructures, such portions as are in way of

corresponding openings in the sides of the ship, not provided with any means of closure
(2) Poop and bridge combined, or forecastle and bridge combined:
(1)
In each of these combined spaces, the following exemptions are allowed under certain
conditions:
a) That length which corresponds only to the openings of the engine-room and boiler

spaces as specified in (1b) above.
b) Such portions as are in way of corresponding openings not provided with any means

of closing in the sides of the ship.
(3) Shelter-decks:

In the case of shelter-decks. The following exemptions are allowed under certain conditions:
a) The portions in way of corresponding openings in the side plating of the ship not
provided with any means of closing.

b) Such air spaces as are situated within the shelter-decks must be measured into the
engine-room space and deducted together with 75% of their volume.

B- Vessels having more than one tier of superstructures:
1) The exemptions Prescribed in paragraph A - (1), (2) and (3) above are applicable to the

lowest tier only.
2) Tiers above the lowest tier, are only allowed the exemption of such portions as are
(1)
in way of corresponding openings in the side plating of the vessel not provided with
any means of closure.

1 ) See (Art. 92 – B p. 177)
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