(1) A building classified as Group C is permitted to conform to Sentence (2), provided,
(a) it is sprinklered,
(b) it is not more than 12 storeys in building height,
(c) it has a height of not more than 42 m measured between the floor of the first storey and the uppermost floor level that does not serve as a rooftop enclosure for elevator machinery, a stairway or a service room used for no purpose other than for service to the building, and
(d) it has a building area not more than 6 000 m2.
(2) Except as provided in Article 3.2.2.16., the building referred to in Sentence (1) is permitted to be of encapsulated mass timber construction or noncombustible construction, used singly or in combination, and,
(a) except as provided in Sentence (3), floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h,
(b) mezzanines shall have a fire-resistance rating not less than 1 h, and
(c) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.
(3) In a building that contains dwelling units that have more than 1 storey, subject to the requirements of Sentence 3.3.4.2. (3), the floor assemblies, including floors over basements, that are entirely contained within these dwelling units shall have a fire-resistance rating not less than 1 h but need not be constructed as fire separations.
(4) Group A, Division 2 major occupancies, Group E major occupancies and storage garages located in a building or part of a building within the scope of this Article are permitted to be constructed in accordance with this Article, provided,
(a) the Group A, Division 2 major occupancy is located below the fourth storey,
(b) the Group E major occupancy is located below the third storey, and
(c) the storage garage is located below the fifth storey.