The Ontario Building Code | Fire-Resistance Ratings for Floors and Roofs

9.10.8.1. Fire-Resistance Ratings for floors and Roofs

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

Table 9.10.8.1.
Fire Resistance Ratings for Structural Members and Assemblies

Forming Part of Sentence 9.10.8.1.(1)

Item

Column 1

Column 2

Column 3

Column 4

Column 5

Major Occupancy

Maximum building Height, Storeys

Minimum Fire-Resistance Rating by Building Element, min

Floors Except Floors over Crawl Spaces

Mezzanine Floors

Roofs

1.

Residential (Group C)

3

45

45

2.

All other occupancies

2

45

3

45

45

45