9.10.8.

(1) Except as otherwise provided in this Subsection, the fire-resistance ratings of floors and roofs shall conform to Table 9.10.8.1.

(1) Except for roofs that support an occupancy, the requirements in Table 9.10.8.1. for roof assemblies to have a fire-resistance rating are permitted to be waived in sprinklered buildings where,

(a) the sprinkler system is electrically supervised in conformance with Sentence 3.2.4.9.(2)v1, and

(b) the operation of the sprinkler system will cause a signal to be transmitted to the fire department in conformance with Sentence 3.2.4.7.(4).

(1) Except as otherwise provided in this Subsection, all loadbearing walls, columns and arches in the storey immediately below a floor or roof assembly shall have a fire-resistance rating of not less than that required for the supported floor or roof assembly.

(1) Construction supporting a service room need not conform to Article 9.10.8.3.

(1) Mezzanines required to be counted as storeys in Articles 9.10.4.1. and 9.10.4.2. shall be constructed in conformance with the requirements for “Floors Except Floors over Crawl Spaces” in Table 9.10.8.1.

(1) Where a portion of a roof supports an occupancy, that portion shall be constructed as a fire separation having a fire-resistance rating conforming to the rating for “Floors Except Floors over Crawl Spaces” in Table 9.10.8.1.

(1) Except as provided in Sentences (2) and (3), the floor assembly of every exterior passageway used as part of a means of egress shall have a fire-resistance rating of not less than 45 min or be of noncombustible construction.

(2) No fire-resistance rating is required for floors of exterior passageways serving buildings of Group D, E or F major occupancy that are not more than 2 storeys in building height.

(3) No fire-resistance rating is required for floors of exterior passageways serving a single dwelling unit where no suite is located above or below the dwelling unit.

(1) Where a crawl space exceeds 1 800 mm in height or is used for any occupancy or as a plenum in combustible construction or for the passage of flue pipes, it shall be considered as a basement in applying the requirements in Article 9.10.8.1.

(1) Table 9.10.8.1. does not apply to a dwelling unit that has no other dwelling unit above or below it or to a dwelling unit that is not above or below another major occupancy.

(1) The fire-resistance ratings of floors, roofs, loadbearing walls, columns and arches need not conform to this Subsection if such assemblies conform in all respects to the appropriate requirements in Section 3.2.