Minimum Protection from Precipitation Ingress

(1)  Exterior walls exposed to precipitation shall be protected against ingress of precipitation with an exterior cladding assembly consisting of a first plane of protection and a second plane of protection where the wall encloses spaces of residential occupancy or spaces that directly serve spaces of residential occupancy.

Article 9.27.2.2. Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.