The Ontario Building Code | Group D, Any Height, Any Area
220.127.116.11. Group D, Any Height, Any Area
(1) Except as permitted by Articles 18.104.22.168. to 22.214.171.124., a building classified as Group D shall conform to Sentence (2).
(2) Except as permitted by Article 126.96.36.199., the buildingreferred to in Sentence (1) shall be of noncombustible construction, and,
(a) except as permitted by Sentence 188.8.131.52.(1), the building shall be sprinklered if it is regulated by Subsection 3.2.6.,
(b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h,
(c) mezzaninesshall have a fire-resistance rating not less 1 h,
(d) if the buildingis not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, except that in a building not more than 1 storeyin building height this requirement is waived, and
(e) loadbearingwalls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.