The Ontario Building Code | Where Required

9.29.2.1. Where Required

(1) waterproof finish shall be provided to a height of not less than,

(a) 1 800 mm above the floor in shower stalls,

(b) 1 200 mm above the rims of bathtubs equipped with showers, and

(c) 400 mm above the rims of bathtubs not equipped with showers.