The Ontario Building Code | Fire Separations for Vertical Service Spaces

3.6.3.1. Fire Separations for Vertical service Spaces

(1) Except as required by Section 3.5., a vertical service space shall be separated from all other portions of each adjacent storey by a fire separation having a fire-resistance ratingconforming to Table 3.6.3.1. for the fire-resistance rating required by Subsection 3.2.2. for,

(a) the floor assembly above the storey, or

(b) the floor assembly below the storey, if there is no floor assembly above.

Table 3.6.3.1.
Fire Separations for Vertical service Space

Forming Part of Clause 3.2.9.2.(9)(b) and Sentence 3.6.3.1.(1)

Item	Column 1 Fire-Resistance Rating of Fire Separation Required for floor Assembly	Column 2 Minimum Fire-Resistance Rating of Vertical service Space
1.	less than 45 min	---
2.	45 min	45 min
3.	1 h	45 min
4.	1.5 h	1 h
5.	2 h or more	1 h

(2) A vertical service space that does not extend through the roof of a building shall be enclosed at the top with construction having a fire-resistance rating not less than that required for the vertical service space walls.

(3) A vertical service space that does not extend to the bottom of a building shall be enclosed at the lowest level with construction having a fire-resistance rating not less than that required for the vertical service space walls.

(4) A vent from a vertical service space not extending to the roof shall be enclosed within the buildingwith construction having a fire-resistance ratingnot less than that required for the vertical service spacewalls.

(5) Only openings that are necessary for the use of the vertical service space shall be permitted through a vertical service space enclosure.