Code Library › Volume 1 › Section 3.2 — Building Fire Safety
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.2.2.58.Group D, up to 6 Storeys

(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 3.2.2.58. Table 3.2.2.58. Maximum Building Area, Group D, up to 6 Storeys Forming Part of Sentence 3.2.2.58.(1) Maximum Area, m2 No. of Storeys Facing 1 Street Facing 2 Streets Facing 3 Streets 1 not limited not limited not limited 2 7 200 not limited not limited 3 4 800 6 000 7 200 4 3 600 4 500 5 400 5 2 800 3 600 4 320 6 2 400 3 000 3 600 (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.

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

← Previous3.2.2.56. Group D, Any Height, Any Area, SprinkleredNext →3.2.2.59. Group D, up to 6 Storeys, Sprinklered, Noncombus

Common questions about this part of the code

When is noncombustible construction required under the Ontario Building Code?When are automatic sprinklers required in a building in Ontario?What are the fire department access route requirements under the Ontario Building Code?When is a fire alarm system required in a building in Ontario?

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.