The Ontario Building Code | Determination of Ratings
3.1.12.1. Determination of Ratings
(1) Except as required by Sentence (2) and as permitted by Sentence (3), the flame-spread rating and smoke developed classification of a material, assembly, or structural member shall be determined on the basis of no fewer than three tests conducted in conformance with CAN/ulc-S102, "Test for surface Burning Characteristics of building Materials and Assemblies".
(2) The flame-spread rating and smoke developed classification of a material or assembly shall be determined on the basis of no fewer than three tests conducted in conformance with CAN/ulc-S102.2, "Test for surface Burning Characteristics of flooring="http://thehandyforce.com/flooring/" title ="Handyman flooring install Toronto">flooring, Floor Coverings, and Miscellaneous Materials and Assemblies", if the material or assembly,
(a) is designed for use in a relatively horizontal position with only its top surface exposed to air,
(b) cannot be tested in conformance with Sentence (1) without the use of supporting material that is not representative of the intended installation, or
(c) is thermoplastic.
(3) A material, assembly, or structural member is permitted to be assigned a flame-spread rating and smoke developed classification on the basis of MMAH Supplementary Standard SB-2, "Fire Performance Ratings".
3.1.13. interior Finish
In Plain Language
Flame-spread rating and smoke-developed classification are generally determined through at least three CAN/ULC-S102 tests, with a separate referenced standard (CAN/ULC-S102.2) used specifically for flooring materials.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.