Div. B › Part 3 › 3.1 › 3.1.7 — Fire-Resistance Ratings

3.1.7.3 — Exposure Conditions for Rating

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(1) Floor, roof and ceiling assemblies shall be rated for exposure to fire on the underside.

(2) Firewalls and interior vertical fire separations shall be rated for exposure to fire on each side.

(3) Exterior walls shall be rated for exposure to fire from inside the building.

OBC Definitions

Defined terms on this page

fire separation

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

firewall

means a type of fire separation of noncombustible construction that subdivides a building or separates adjoining buildings to resist the spread of fire and that has a fire-resistance rating as prescribed in this Code and the structural stability to remain intact under fire conditions for the required fire-rated time.

building

(a) a structure occupying an area greater than ten square metres consisting of a wall, roof and floor or any of them or a structural system serving the function thereof including all plumbing, works, fixtures and service systems appurtenant thereto,
(b) a structure occupying an area of ten square metres or less that contains plumbing, including the plumbing appurtenant thereto,
(c) plumbing not located in a structure,
(c.1) a sewage system, or
(d) structures designated in the building code; Act

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