Restraint of Joist Bottoms

(1)  Roof joists supporting a finished ceiling, other than plywood, OSB or waferboard, shall be restrained from twisting along the bottom edges by means of furring, blocking, cross bridging or strapping conforming to Article 9.23.9.3.

Article 9.23.13.9 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.