Firewalls in Detached Garages

(1)  Where a garage is detached from the house or the individual dwelling unit it serves but attached to another garage on the adjacent property, the party wall so formed shall be constructed as a fire separation having a fire-resistance rating of not less than 45 min.

Article 9.10.11.4 Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.