Flame-Spread Rating of Interior Surfaces

(1)  Except as otherwise provided in this Subsection, the exposed surface of every interior wall and ceiling, including skylights and glazing, shall have a surface flame-spread rating of not more than 150.

(2)  Except as permitted in Sentence (3), doors need not conform to Sentence (1) provided they have a surface flame-spread rating of not more than 200.

Article 9.10.17.1 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.