3.1.15.2 — Roof Coverings

(1) A roof covering classification shall be determined in conformance with CAN/ULC-S107, “Fire Tests of Roof Coverings”.

(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.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) it is sprinklered, (b) it is not more than 6 storeys in building height, (c) it has a height of not more than 18 m, measured between the floor level of the first storey and the floor level of the uppermost storey or mezzanine that is not a rooftop enclosure provided 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 of not more than, (i) 9 000 m2 if 1 storey in building height, (ii) 4 500 m2 if 2 storeys in building height, (iii) 3 000 m2 if 3 storeys in building height, (iv) 2 250 m2 if 4 storeys in building height, (v) 1 800 m2 if 5 storeys in building height, or (vi) 1 500 m2 if 6 storeys in building height. (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) except as permitted by Sentence (3), floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) roof assemblies shall have a fire-resistance rating not less than 1 h, (c) except as provided by Sentence (4), where the roof assembly has a height greater than 25 m measured from the floor level of the first storey to the highest point of the roof assembly, the roof assembly shall, (i) be of noncombustible construction, or (ii) be constructed of fire-retardant treated wood conforming to Article 3.1.4.5., (d) mezzanines shall have a fire-resistance rating not less than 1 h, (e) [[NO_FORMULA]] Revoked: O. Reg. 89/23, s. 7 (1). (f) 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, which 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) The construction of non-contiguous roof assemblies at different elevations is permitted to be evaluated separately to determine which roof assemblies are required to be constructed in accordance with Clause (2)(c). (5) 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) Group A, Division 2 major occupancies and Group E major occupancies are located below the third storey, and (b) storage garages are located below the fourth storey.

(1) A building classified as Group D 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 7 200 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 nonconbustible construction, used singly or in combination, and, (a) 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) Group A, Division 2 major occupancies, Group E major occupancies, Group F, Division 2 and 3 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 and Group F, Division 2 or 3 major occupancy are located below the third storey, and (c) the storage garage is located below the fifth storey.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) it is sprinklered, (b) it is not more than 6 storeys in building height, (c) it has a height of not more than 18 m, measured between the floor level of the first storey and the floor level of the uppermost storey or mezzanine that is not a rooftop enclosure provided 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 of not more than, (i) 18 000 m2 if 1 storey in building height, (ii) 9 000 m2 if 2 storeys in building height, (iii) 6 000 m2 if 3 storeys in building height, (iv) 4 500 m2 if 4 storeys in building height, (v) 3 600 m2 if 5 storeys in building height, or (vi) 3 000 m2 if 6 storeys in building height. (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) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) roof assemblies shall have a fire-resistance rating not less than 1 h, (c) except as provided by Sentence (3), where the roof assembly has a height greater than 25 m measured from the floor level of the first storey to the highest point of the roof assembly, the roof assembly shall, (i) be of noncombustible construction, or (ii) be constructed of fire-retardant treated wood conforming to Article 3.1.4.5., (d) mezzanines shall have a fire-resistance rating not less than 1 h, (e) Revoked: O. Reg. 89/23, s. 8 (1). (f) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly. (3) The construction of non-contiguous roof assemblies at different elevations is permitted to be evaluated separately to determine which roof assemblies are required to be constructed in accordance with Clause (2)(c). (4) Group A, Division 2 major occupancies, Group E major occupancies, Group F, Division 2 and 3 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) Group A, Division 2 major occupancies, Group E major occupancies and Group F, Division 2 or 3 major occupancies are located below the third storey, and (b) storage garages are located below the fourth storey.

(1) Steel building systems shall be manufactured by companies certified in accordance with the requirements of CSA A660, “Certification of Manufacturers of Steel Building Systems”.