The Ontario Building Code | Sprinklers in Lieu of Roof Rating
220.127.116.11. Sprinklers in Lieu of Roof Rating
(1) The requirements in Articles 18.104.22.168. to 22.214.171.124. for roof assemblies to have a fire-resistance rating are permitted to be waived provided,
(a) except as provided by Sentence (2), the building is sprinklered,
(b) the sprinkler system in Clause (a) is electrically supervised in conformance with Sentence 126.96.36.199.(3), and
(c) the operation of the sprinkler system in Clause (a) will cause a signal to be transmitted to the fire department in conformance with Sentence 188.8.131.52.(4).
(2) The fire-resistance rating of roof assemblies required by Clause 184.108.40.206A.(2)(b) or 220.127.116.11A.(2)(b) is not permitted to be waived.