(1)
Method IF. In accommodation and
service spaces and control stations all linings draught stops, ceilings
and their associated grounds shall be of non-combustible materials.
(2)
Method IIF and IIIF. In corridors
and stairway enclosures serving accommodation and service spaces and
control stations, ceilings, linings, draught stops and their associated
grounds shall be of non-combustible materials.
(3)
Method IF, IIF and IIIF
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(a) Except in cargo spaces or refrigerated compartments
of service spaces insulating materials shall be non-combustible. Vapour
barriers and adhesives used in conjunction with insulation, as well
as the insulation of pipe fittings, for cold service systems need
not be of non-combustible material, but they shall be kept to the
minimum quantity practicable and their exposed surfaces shall have
qualities of resistance to the propagation of flame to the satisfaction
of the Administration. In spaces where penetration of oil products
is possible, the surface of insulation shall be impervious to oil
or oil vapour.
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(b) Where non-combustible bulkheads, linings and
ceilings are fitted in accommodation and service spaces they may have
a combustible veneer not exceeding 2.0 mm in thickness within any
such space except corridors, stairway enclosures and control stations,
where it shall not exceed 1.5 mm in thickness.
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(c) Air spaces enclosed behind ceilings, panellings,
or linings shall be divided by close-fitting draught stops spaced
not more than 14 m apart. In the vertical direction, such spaces,
including those behind linings of stairways, trunks, etc., shall be
closed at each deck.