Code Library › Volume 1 › Section 3.1 — General
PART 3 — FIRE PROTECTION, OCCUPANT SAFETY AND ACCESSIBILITYUpdated for the 2024 Ontario Building Code

3.1.13.2.Flame-Spread Rating

(1) Except as otherwise required or permitted by this Subsection, the flame-spread rating of interior wall and ceiling finishes, including glazing and skylights, shall be not more than 150 and shall conform to Table 3.1.13.2. (2) Except as permitted by Sentence (3), doors, other than those in Group A, Division 1 occupancies, need not conform to Sentence (1) provided they have a flame-spread rating not more than 200. (See Note A-3.1.13.2.(2)) (3) Doors within a dwelling unit need not conform to Sentences (1) and (2). Table 3.1.13.2. Flame-Spread Ratings Forming Part of Sentence 3.1.13.2.(1) Maximum Flame-Spread Rating for Occupancy, Location or Element Walls and Ceilings Sprinklered Not Sprinklered Group A, Division 1 occupancies, including doors, skylights, glazing and light diffusers 150 75 and lenses Group B occupancies 150 75 Exits(1) 25 25 Lobbies described in Sentence 3.4.4.2.(2) 25 25 Covered vehicular passageways, except for roof assemblies of heavy timber construction in the 25 25 passageways Vertical service spaces 25 25 Notes to Table 3.1.13.2.: (1) See Articles 3.1.13.8. and 3.1.13.10. (4) Up to 10% of the total wall area and 10% of the total ceiling area of a wall or ceiling finish that is required by Sentence (1) to have a flame-spread rating less than 150 is permitted to have a flame-spread rating not more than 150, except that up to 25% of the total wall area of lobbies described in Sentence 3.4.4.2.(2) is permitted to have a flame- spread rating not more than 150. (5) Except in the case of Group A, Division 1 occupancies, combustible doors, skylights, glazing and light diffusers and lenses shall not be considered in the calculation of wall and ceiling areas described in Sentence (4).

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

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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.