The Ontario Building Code | Flame-Spread Rating
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.
Table 3.1.13.2.
Flame-Spread Ratings
Forming Part of Sentence 3.1.13.2.(1)
| Item | Column 1 | Column 2 | Column 3 |
|
| Occupancy, Location or Element | ||
|
|
| Sprinklered | Not Sprinklered |
| 1. | Group A, Division 1 occupancies, including doors, skylights, glazing and light diffusers and lenses | 150 | 75 |
| 2. | Group B occupancies | 150 | 75 (2) |
| 3. | Exits(1) | 25 | 25 |
| 4. | Lobbies described in Sentence 3.4.4.2.(2) | 25 | 25 |
| 5. | Covered vehicular passageways, except for roof assemblies of heavy timber construction in such passageways | 25 | 25 |
| 6. | Vertical service spaces | 25 | 25 |
Notes to Table 3.1.13.2.:
(1) See Articles 3.1.13.8. and 3.1.13.10.
(2) Group B occupancies are required to be sprinklered. See Part 11 for renovations of existing non-sprinklered Group B occupancies.
(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 ratingnot more than 200.
(3) doors within a dwelling unit need not conform to Sentences (1) and (2).
(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).