The Ontario Building Code | Group A, Division 3, 1 Storey, Increased Area
3.2.2.32. Group A, Division 3, 1 Storey, Increased Area
(1) A building classified as Group A, Division 3 is permitted to conform to Sentences (2)
and (3) provided,
(a) it is not more than 1 storey in building height, and
(b) it has a building area not more than,
(i) 2 400 m2if facing one street,
(ii) 3 000 m2if facing two streets, or
(iii) 3 600 m2if facing three streets.
(2) The building referred to in Sentence (1) is permitted to be of combustible construction or noncombustible construction used singly or in combination, and,
(a) mezzaninesshall have, if of combustible construction, a fire-resistance rating not less than 45 min,
(b) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, except that the fire-resistance rating is permitted to be waived provided the roof assembly is constructed as a fire-retardant treated wood roof system conforming to Article 3.1.14.1., and the building area is not more than,
(i) 1 200 m2if facing one street,
(ii) 1 500 m2if facing two streets, or
(iii) 1 800 m2if facing three streets, and
(c) loadbearingwalls, columns and arches supporting an assembly required to have a fire-resistance rating shall,
(i) have a fire-resistance rating not less than 45 min, or
(ii) be of noncombustible construction.
(3) If intended for occasional use for trade shows and similar exhibition purposes, the building referred to in Sentence (1) that is more than 1 500 m2 in building area shall be sprinklered.