§ 149.206 - Construction.

(a) The following walls or decks on a platform must meet the requirements in 46 CFR 92.07-5(b) for “A” class bulkheads, except that each wall or deck must be made of steel:

(1) Each wall or deck that separates a galley, a paint and lamp locker, a space housing emergency power generating equipment, or a machinery space from any other space.

(2) Each wall or deck of an interior stairway connecting enclosed spaces on three or more decks.

(3) Each wall or deck of an elevator shaft, of a dumbwaiter shaft, and of any other shaft connecting two or more enclosed spaces.

(b) The following walls or decks on a platform must meet the requirements in 46 CFR 92.07-5 (b) or (c) for “A” or “B” class bulkheads:

(1) Each corridor wall or deck of a personal accommodation space.

(2) Each wall or deck of a stairway that connects two decks or each wall or deck of a structure enclosing an opening to the stairway.

(c) A platform wall or deck that is not described in paragraph (a) or (b) of this section must meet the requirements in 46 CFR 92.07-5 (b), (c), or (d) for “A”, “B”, or “C” class bulkheads.

(d) Each deck and stairway on a platform must be made of steel and may have a deck covering.

(e) A space that is described in paragraphs (a)(2) or (a)(3) of this section must be enclosed by walls and decks.

(f) Each interior stairway that connects two enclosed spaces on a platform must be enclosed by walls and decks or an opening to the stairway must be enclosed by a structure.

(g) Each interior stairway that connects three or more decks on a platform must have access to each deck.

(h) Each opening in a wall or deck on a platform must have a closure that meets the requirements in this section for the wall or deck. Each door must:

(1) Be a self-closing type;

(2) Not have holdback hooks or other means of permanently holding the door open, except for magnetic holdbacks operated from a suitable remote control position; and

(3) Not have a louver or other opening, except that a door to a sleeping space may have a louver in the lower half of the door.

(i) Internal deck coverings, except those in washrooms and toilet spaces, must be of a type approved under 46 CFR Subpart 164.006. Overlays for leveling or finishing purposes which do not meet the requirements in 46 CFR Subpart 164.006 may be used in thicknesses not exceeding 3/8 of an inch.

(j) Each ceiling, sheathing, furring, and insulation on a platform, must be a noncombustible material of a type that is approved under 46 CFR 164.009.

(k) The interior finish on each wall and ceiling in a corridor or hidden space on a platform must be a type that is approved under 46 CFR 164.012. Walls within a room may have a combustible veneer not to exceed 2/28 inches in thickness.

(l) Nitrocellulose or other highly flammable or noxious fume-producing paints or lacquers may not be used.