The Ontario Building Code | Sprinklers in Lieu of Roof Rating
188.8.131.52. Sprinklers in Lieu of Roof Rating
(1) The requirements in Articles 184.108.40.206. to 220.127.116.11. 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 18.104.22.168.(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 22.214.171.124.(4).
(2) The fire-resistance rating of roof assemblies required by Clause 126.96.36.199A.(2)(b) or 188.8.131.52A.(2)(b) is not permitted to be waived.