The Ontario Building Code | Fire-Resistance Ratings in Sprinklered Buildings
9.10.8.2. Fire-Resistance Ratings in Sprinklered buildings
(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 3.2.4.10.(3), and
(b) the operation of the sprinkler system will cause a signal to be transmitted to the fire department in conformance with Sentence 3.2.4.8.(4).
In Plain Language
Buildings protected by an automatic sprinkler system may qualify for adjusted fire-resistance rating requirements, as set out in this article, since sprinklers meaningfully reduce fire severity and spread.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.