Floor Drains (1) A floor drain shall be installed in a basement forming part of a dwelling unit. Article 9.31.4.4 Ontario Regulation 332/12 Building Code, O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021 Similar articles Floor Drains Plumbing Fixtures Pipe Arrangement for DWV Fittings Table Notching of Lumber Roof, Ceiling or Floor Joists