3.2.1.5 — Fire Containment in Basements

(1) If a building is erected entirely below the adjoining finished ground level and does not extend more than 1 storey below that ground level, the minimum precautions against fire spread and collapse shall be the same as are required for basements under a building of 1 storey in building height having the same occupancy and building area. (2) If any portion of a building is erected entirely below the adjoining finished ground level and extends more than 1 storey below that ground level, the following minimum precautions against fire spread and collapse shall be taken: (a) except as permitted by Sentence (3), the basements shall be sprinklered, (b) a floor assembly below the ground level shall be constructed as a fire separation with a fire-resistance rating not less than, (i) 3 h if the basements are intended for use as Group E or Group F, Division 1 or 2 occupancies, or (ii) 2 h if the basements are not intended for use as Group E or Group F, Division 1 or 2 occupancies, and (c) all loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the construction that they support. (3) If the first storey of a building is not required to be sprinklered, sprinklers are not required in the storey immediately below the first storey, provided the storey below, (a) contains only residential occupancies, and (b) has at least one unobstructed access opening conforming to Sentence 3.2.5.1. (2) installed on that storey for each 15 m of wall length in at least one wall required by this Subsection to face a street.

(1) Except as permitted by Articles 3.2.2.21. and 3.2.2.22., a building classified as Group A, Division 1 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less than 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group A, Division 1 is permitted to conform to Sentence (2) provided, (a) it is not more than 1 storey in building height, (b) it has less than 40% of the area of the building as 2 storeys for the purpose of, (i) development of productions including preparation of scenery and costumes and rehearsal of performers, (ii) organization of performers, scenery and sound equipment, (iii) preparation by performers for a performance, (iv) managerial functions, or (v) toilets, rest rooms and similar public facilities, (c) it has no occupancy above or below the auditorium other than one that serves it or is dependent on it, (d) it is not more than 600 m2 in building area, and (e) the occupant load is not more than 600. (2) The building referred to in Sentence (1) is permitted to be of heavy timber construction or noncombustible construction used singly or in combination, and, (a) floor assemblies shall be fire separations, (i) with a fire-resistance rating not less than 45 min, or (ii) of heavy timber construction, and (b) loadbearing walls, columns and arches shall, (i) have a fire-resistance rating not less than that required for the supported assembly, or (ii) be of heavy timber construction.

(1) A building classified as Group A, Division 1 is permitted to conform to Sentence (2) provided, (a) it is not more than 1 storey in building height, (b) no part of an auditorium floor is more than 5 m above or below grade, (c) no occupancy is above or below the auditorium other than one that serves it or is dependent on it, and (d) the occupant load of the auditorium floor is not more than 300. (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 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, and (d) loadbearing walls, 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, and (e) loadbearing walls, columns and arches supporting a fire separation shall have a fire-resistance rating not less than that required for the fire separation.

(1) Except as permitted by Articles 3.2.2.24. to 3.2.2.28., a building classified as Group A, Division 2 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group A, Division 2, that is not limited by building area, is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, and (b) it is not more than 6 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, and (c) all loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group A, Division 2 is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.25. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less 45 min, (c) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, except that in a building not more than 1 storey in building height, 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) 800 m2 if facing one street, (ii) 1 000 m2 if facing two streets, or (iii) 1 200 m2 if facing three streets, and (d) loadbearing walls, 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.

(1) A building classified as Group A, Division 2 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 4 800 m2 if 1 storey in building height, or (ii) 2 400 m2 if 2 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less 45 min, and (c) loadbearing walls, 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.

(1) A building classified as Group A, Division 2 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 2 400 m2 if 1 storey in building height with no basement, (ii) 1 200 m2 if 1 storey in building height, or (iii) 600 m2 if 2 storeys in building height.

(1) A building classified as Group A, Division 2 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided, (a) it is not more than 1 storey in building height, and (b) except as permitted by Sentence (2), it has a building area not more than, (i) 400 m2 if facing one street, (ii) 500 m2 if facing two streets, or (iii) 600 m2 if facing three streets. (2) In a building referred to in Sentence (1) without a basement, the building area limits of Sentence (1) are permitted to be doubled provided a fire separation with a fire-resistance rating not less than 1 h is used to separate the building into fire compartments, each one of which does not exceed the area limits of Clause (1)(b).

(1) Except as permitted by Articles 3.2.2.30. to 3.2.2.34., a building classified as Group A, Division 3 shall conform to Sentences (2) and (3). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (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) mezzanines shall have a fire-resistance rating not less than 1 h, (d) if the building is not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, and (e) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly. (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.

(1) A building classified as Group A, Division 3 is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.30. (2) Except as permitted by Clauses (c) and (d), the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, (c) roof assemblies shall, (i) have a fire-resistance rating not less than 45 min, or (ii) be of heavy timber construction, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly, except that arches and structural members within the storey immediately below a roof assembly are permitted to be of heavy timber 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.

(1) A building classified as Group A, Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 12 000 m2 if 1 storey in building height, or (ii) 6 000 m2 if 2 storeys in building height. (2) Except as permitted by Clause (c) and Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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, except that arches are permitted to be of heavy timber construction.

(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 m2 if facing one street, (ii) 3 000 m2 if facing two streets, or (iii) 3 600 m2 if 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) mezzanines shall 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 m2 if facing one street, (ii) 1 500 m2 if facing two streets, or (iii) 1 800 m2 if facing three streets, and (c) loadbearing walls, 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.

(1) A building classified as Group A, Division 3 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 1 storey in building height, and (c) it has a building area not more than 7 200 m2.

(1) A building classified as Group A, Division 3 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided, (a) it is not more than 1 storey in building height, and (b) it has a building area not more than, (i) 1 000 m2 if facing one street, (ii) 1 250 m2 if facing two streets, or (iii) 1 500 m2 if facing three streets.

(1) Except as permitted by Sentences (2) and (3), a building classified as Group A, Division 4 shall be of noncombustible construction. (2) Roof assemblies and supporting arches and columns are permitted to be of heavy timber construction. (3) A building classified as Group A, Division 4 is permitted to be of combustible construction provided, (a) the occupant load is less than 1 500, and (b) the building has a limiting distance not less than 6 m. (4) Sprinklers shall be installed in all spaces below tiers of seats in a building classified as Group A, Division 4 if those spaces are used for occupancy.

(1) Except as permitted by Article 3.2.2.37., a building classified as Group B, Division 1 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group B, Division 1 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1) the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area, (i) that is not limited if the building is not more than 1 storey in building height, (ii) not more than 12 000 m2 if 2 storeys in building height, or (iii) not more than 8 000 m2 if 3 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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.

(1) Except as permitted by Articles 3.2.2.39. to 3.2.2.41., a building classified as Group B, Division 2 or Division 3 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group B, Division 2 or Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area, (i) that is not limited if the building is not more than 1 storey in building height, (ii) not more than 12 000 m2 if 2 storeys in building height, or (iii) not more than 8 000 m2 if 3 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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.

(1) A building classified as Group B, Division 2 or Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 2 400 m2 if 1 storey in building height, or (ii) 1 600 m2 if 2 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 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, and (c) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group B, Division 2 or Division 3 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 1 storey in building height, and (c) it has a building area not more than 500 m2.

(1) Except as permitted by Articles 3.2.2.43. to 3.2.2.48., a building classified as Group C, other than a retirement home, shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) except as permitted by Sentence (3), floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less than 1 h, and (d) 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.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 6 storeys in building height, and (c) it has a building area, (i) that is not limited if the building is not more than 2 storeys in building height, (ii) not more than 12 000 m2 if 3 storeys in building height, (iii) not more than 9 000 m2 if 4 storeys in building height, (iv) not more than 7 200 m2 if 5 storeys in building height, or (v) not more than 6 000 m2 if 6 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, 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) 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, 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.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) it is not more than, (i) 3 storeys in building height, or (ii) 4 storeys in building height provided there is not more than one dwelling unit above another dwelling unit, and vertical fire separations of adjacent dwelling units conform to Sentence (4), and (b) it has a building area not more than the value in Table 3.2.2.44. (2) The building referred to in Sentence (1) shall be of noncombustible construction, 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) mezzanines shall have a fire-resistance rating not less than 1 h, (c) roof assemblies shall have a fire-resistance rating not less than 1 h, and (d) 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 dwelling units described in Subclause (1)(a)(ii) shall be separated by continuous vertical fire separations that extend through all storeys and service spaces of the separated portions. (5)[[NO_FORMULA]] Revoked: O. Reg. 139/17, s. 19.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 4 storeys in building height, and (c) it has a building area not more than, (i) 7 200 m2 if 1 storey in building height, (ii) 3 600 m2 if 2 storeys in building height, (iii) 2 400 m2 if 3 storeys in building height, or (iv) 1 800 m2 if 4 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 Sentences (3) and (4), floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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) In a building in which there is no dwelling unit above another dwelling unit, the fire-resistance rating for floor assemblies entirely within the dwelling unit is waived.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) it is not more than 3 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.46. (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 Sentences (3) and (4), floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, (c) roof assemblies shall have a fire-resistance rating not less than 1 h, and (d) 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) In a building in which there is no dwelling unit above another dwelling unit, the fire-resistance rating for floor assemblies entirely within the dwelling unit is waived. (5)[[NO_FORMULA]] Revoked: O. Reg. 139/17, s. 21.

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) it is not more than 3 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.47. (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 Sentences (3) and (4), floor assemblies shall be fire separations with a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, 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 45 min but need not be constructed as fire separations. (4) In a building in which there is no dwelling unit above another dwelling unit, the fire-resistance rating for floor assemblies entirely within the dwelling unit is waived. (5)[[NO_FORMULA]] Revoked: O. Reg. 139/17, s. 22 (2).

(1) A building classified as Group C, other than a retirement home, is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area not more than, (i) 5 400 m2 if 1 storey in building height, (ii) 2 700 m2 if 2 storeys in building height, or (iii) 1 800 m2 if 3 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 Sentences (3) and (4), floor assemblies shall be fire separations with a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction a fire-resistance rating not less than 45 min, 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 45 min but need not be constructed as fire separations. (4) In a building in which there is no dwelling unit above another dwelling unit, the fire-resistance rating for floor assemblies entirely within the dwelling unit is waived.

(1) Except as permitted by Articles 3.2.2.50. to 3.2.2.56., a building classified as Group D shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (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) mezzanines shall have a fire-resistance rating not less 1 h, (d) if the building is not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, except that in a building not more than 1 storey in building height this requirement is waived, and (e) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) it is not more than 6 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.50. (2) The building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, (c) roof assemblies shall have a fire-resistance rating not less than 1 h, except that in a building not more than 1 storey in building height this requirement is waived, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 6 storeys in building height, and (c) it has a building area, (i) that is not limited if the building is not more than 2 storeys in building height, (ii) not more than 14 400 m2 if 3 storeys in building height, (iii) not more than 10 800 m2 if 4 storeys in building height, (iv) not more than 8 640 m2 if 5 storeys in building height, or (v) not more than 7 200 m2 if 6 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 4 storeys in building height, and (c) it has a building area not more than 3 600 m2. (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) 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.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) it is not more than 3 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.53. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, except that in a building not more than 1 storey in building height, 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) 2 400 m2 if facing one street, (ii) 3 000 m2 if facing two streets, or (iii) 3 600 m2 if facing three streets, and (d) loadbearing walls, 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.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area not more than, (i) 14 400 m2 if 1 storey in building height, (ii) 7 200 m2 if 2 storeys in building height, or (iii) 4 800 m2 if 3 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, and (c) loadbearing walls, 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.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.55. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, and (b) loadbearing walls, 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.

(1) A building classified as Group D is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 3 000 m2 if 1 storey in building height, or (ii) 2 400 m2 if 2 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, and (b) loadbearing walls, 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.

(1) Except as permitted by Articles 3.2.2.58. to 3.2.2.62., a building classified as Group E shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group E is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 4 storeys in building height, and (c) it has a building area not more than 1 800 m2. (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) 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.

(1) A building classified as Group E is permitted to conform to Sentence (2) provided, (a) it is not more than 3 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.59. (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 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) roof assemblies shall have a fire-resistance rating not less than 45 min, except that in a building not more than 1 storey in building height, the fire-resistance rating is permitted to be waived provided the roof assembly is of noncombustible construction or is constructed as a fire-retardant treated wood roof system conforming to Article 3.1.14.1., (d) loadbearing walls, 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, and (e) loadbearing walls, columns and arches supporting a fire separation shall have a fire-resistance rating not less than that required for the fire separation.

(1) A building classified as Group E is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area not more than, (i) 7 200 m2 if 1 storey in building height, (ii) 3 600 m2 if 2 storeys in building height, or (iii) 2 400 m2 if 3 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 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) loadbearing walls, 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, and (d) loadbearing walls, columns and arches supporting a fire separation shall have a fire-resistance rating not less than that required for the fire separation.

(1) A building classified as Group E is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.61. (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 45 min, and (b) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group E is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 3 000 m2 if 1 storey in building height, or (ii) 1 800 m2 if 2 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 45 min, and (b) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) Except as permitted by Articles 3.2.2.64. to 3.2.2.66., a building classified as Group F, Division 1 shall conform to Sentence (2) provided, (a) it is not more than 4 storeys in building height, and (b) it has a building area 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, or (iv) 2 250 m2 if 4 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less than 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 1 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 3 storeys in building height, and (c) it has a building area not more than, (i) 3 600 m2 if 1 storey in building height, (ii) 1 800 m2 if 2 storeys in building height, or (iii) 1 200 m2 if 3 storeys in building height. (2) The building referred to in Sentence (1) is permitted to be of heavy timber 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 45 min, (b) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 1 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 2 400 m2 if 1 storey in building height, or (ii) 1 200 m2 if 2 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) loadbearing walls, 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.

(1) A building classified as Group F, Division 1 is permitted to be of combustible construction or noncombustible construction used singly or in combination provided, (a) it is not more than 1 storey in building height, and (b) it has a building area not more than 800 m2.

(1) Except as permitted by Articles 3.2.2.68. to 3.2.2.72., a building classified as Group F, Division 2 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (1), the building shall be sprinklered, (b) floor assemblies shall be fire separations with a fire-resistance rating not less than 2 h, (c) mezzanines shall have a fire-resistance rating not less 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 2 is permitted to conform to Sentence (2) provided, (a) it is not more than 6 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.68.A. or Table 3.2.2.68.B. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, 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, (c) if the building is not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 2 is permitted to conform to Sentence (2) provided, (a) it is not more than 4 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.69.A. or Table 3.2.2.69.B. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, (c) if the building is not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 2 is permitted to conform to Sentence (2) provided, (a) it is not more than 4 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.70.A. or Table 3.2.2.70.B. (2) The building referred to in Sentence (1) shall 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 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) if the building is not sprinklered, roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, except that in buildings not more than 1 storey in building height, 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) 1 600 m2 if facing one street, (ii) 2 000 m2 if facing two streets, or (iii) 2 400 m2 if facing three streets, (d) loadbearing walls, 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, and (e) loadbearing walls, columns and arches supporting a fire separation shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 2 is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.71. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, and (b) loadbearing walls, 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.

(1) A building classified as Group F, Division 2 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 4 500 m2 if 1 storey in building height, or (ii) 1 800 m2 if 2 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, and (b) loadbearing walls, 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.

(1) Except as permitted by Articles 3.2.2.74. to 3.2.2.83., a building classified as Group F, Division 3 shall conform to Sentence (2). (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) except as permitted by Sentence 3.2.2.7. (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, except that floor assemblies are permitted to be fire separations with a fire-resistance rating not less than 1 h in a storage garage with all storeys constructed as open-air storeys, (c) mezzanines shall have a fire-resistance rating not less 1 h, (d) if the building is not sprinklered, roof assemblies shall have a fire-resistance rating not less than 1 h, and (e) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) it is not more than 6 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.74. (2) The building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 h, (b) mezzanines shall have a fire-resistance rating not less than 1 h, (c) roof assemblies shall have a fire-resistance rating not less than 1 h, and (d) loadbearing walls, columns and arches shall have a fire-resistance rating not less than that required for the supported assembly.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 6 storeys in building height, and (c) it has a building area, (i) that is not limited if the building is not more than 1 storey in building height, (ii) not more than 21 600 m2 if 2 storeys in building height, (iii) not more than 14 400 m2 if 3 storeys in building height, (iv) not more than 10 800 m2 if 4 storeys in building height, (v) not more than 8 640 m2 if 5 storeys in building height, or (vi) not more than 7 200 m2 if 6 storeys in building height. (2) Except as permitted by Article 3.2.2.16., the building referred to in Sentence (1) shall be of noncombustible construction, and, (a) floor assemblies shall be fire separations with a fire-resistance rating not less than 1 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.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) it is not more than 4 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.76. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, (c) roof assemblies shall have, if of combustible construction, a fire-resistance rating not less than 45 min, except that in a building not more than 1 storey in building height, 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) 2 400 m2 if facing one street, (ii) 3 000 m2 if facing two streets, or (iii) 3 600 m2 if facing three streets, and (d) loadbearing walls, 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.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 4 storeys in building height, and (c) it has a building area not more than, (i) 14 400 m2 if 1 storey in building height, (ii) 7 200 m2 if 2 storeys in building height, (iii) 4 800 m2 if 3 storeys in building height, or (iv) 3 600 m2 if 4 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) mezzanines shall have, if of combustible construction, a fire-resistance rating not less than 45 min, and (c) loadbearing walls, 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.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) it is not more than 2 storeys in building height, and (b) it has a building area not more than the value in Table 3.2.2.78. (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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) loadbearing walls, 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.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 2 storeys in building height, and (c) it has a building area not more than, (i) 7 200 m2 if 1 storey in building height, or (ii) 2 400 m2 if 2 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 and, if of combustible construction, shall have a fire-resistance rating not less than 45 min, (b) loadbearing walls, 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.

(1) A building classified as Group F, Division 3 is permitted to be of heavy timber construction or noncombustible construction used singly or in combination provided, (a) it is not more than 1 storey in building height, and (b) it has a building area not more than, (i) 5 600 m2 if facing one street, (ii) 7 000 m2 if facing two streets, or (iii) 8 400 m2 if facing three streets.

(1) A building classified as Group F, Division 3 is permitted to be of heavy timber construction or noncombustible construction used singly or in combination provided, (a) except as permitted by Sentence 3.2.2.7. (1), the building is sprinklered, (b) it is not more than 1 storey in building height, and (c) it has a building area not more than 16 800 m2.

(1) A building classified as Group F, Division 3 is permitted to conform to Sentence (2) provided it is, (a) not more than 1 storey in building height, (b) used solely for low fire load occupancies such as, (i) power generating plants, or (ii) plants for the manufacture or storage of noncombustible materials, and (c) not limited in building area. (2) The building referred to in Sentence (1) shall be of noncombustible construction.

(1) A building used as a storage garage with all storeys constructed as open-air storeys and having no other occupancy above it is permitted to have its floor, wall, ceiling and roof assemblies constructed without a fire-resistance rating provided it is, (a) of noncombustible construction, (b) not more than 22 m high, measured between grade and the ceiling level of the top storey, (c) not more than 10 000 m2 in building area, and (d) designed so that every portion of each floor area is within 60 m of an exterior wall opening.