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9.10.9.4.(3)
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Application
Application 1: 
Floor assemblies for which no fire-resistance rating is required by Subsection 9.10.8. and floors of mezzanines not required to be counted as storeys in Articles 9.10.4.1. and 9.10.4.2., in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
This applies to:
  • floors of mezzanines not exceeding 10% of the floor area of the storey in which they are located, or less than 40% of the floor area of the storey in which they are located where the space above the mezzanine floors and the floor below them have no visual obstructions more than 1 070 mm above such floors, as stated in Article 9.10.4.1.,
  • the first storey of a mezzanine with more than one level, as stated in Sentence 9.10.4.2.(1),
  • floors of exterior passageways serving buildings of Group D, E or F major occupancy, not more than 2 storeys in building height, as stated in Sentence 9.10.8.8.(2),
  • floors of exterior passageways serving single dwelling units where no suite is located above or below the dwelling unit, as stated in Sentence 9.10.8.8.(3),
  • floors over crawl spaces not exceeding 1.8 m in height and not used for any occupancy nor as a plenum in combustible construction nor for the passage of flue pipes, as stated in Sentence 9.10.8.9.(1), and
  • floors of dwelling units having no other dwelling unit above or below, and to dwelling units not above or below another major occupancy, as stated in Sentence 9.10.8.10.(1).
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Intent
Intent 1: 
To exempt certain mezzanine floors and floor assemblies from the requirements of Sentence 9.10.9.4.(1), which would otherwise require the floors to be fire separations, on the basis that such floors are limited in size or number of storeys [e.g. floors above crawl spaces, floors of exterior passageways], and are not considered to be exposed to substantial fire hazards.
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