3.1.8.3.

(1) Except as permitted by Sentence 3.6.4.2.(2), a horizontal service space or other concealed space located above a required vertical fire separation, including the walls of a vertical shaft, shall be divided at the fire separation by an equivalent fire separation within the service space.

(2) The fire separation required by Sentence (1) shall terminate so that smoke-tight joints are provided where it abuts on or intersects,

(a) a floor,

(b) a roof slab, or

(c) a roof deck.

(3) Except as required by Subsection 3.6.3. for a shaft penetrating a roof assembly, a shaft, including an exit enclosure, that penetrates a fire separation, shall,

(a) extend through any horizontal service space or any other concealed space, and

(b) terminate so that smoke-tight joints are provided where the shaft abuts on or intersects,

(i) a floor,

(ii) a roof slab, or

(iii) a roof deck.

(4) The continuity of a fire separation shall be maintained where it abuts another fire separation, a floor, a ceiling, or an exterior wall assembly.