Div. B › Part 3 › 3.1 › 3.1.8 — Fire Separations and Closures

3.1.8.3 — Continuity of Fire Separations

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(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

(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.

OBC Definitions

Defined terms on this page

exit

means that part of a means of egress, including doorways, that leads from the floor area it serves to a separate building, an open public thoroughfare or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare.

fire separation

means a construction assembly that acts as a barrier against the spread of fire.

horizontal service space

means a space such as an attic, duct, ceiling, roof or crawl space, (a)that is oriented essentially in a horizontal plane, (b)that is concealed and generally inaccessible, and (c)through which building service facilities such as pipes, ducts and wiring may pass.

service space

means space provided in a building to facilitate or conceal the installation of building service facilities such as chutes, ducts, pipes, shafts or wires.

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