B-1.1, r. 2 - Construction Code

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10.06. The walls of a pool must be vertical down to 150 mm from the bottom for the section that is between 750 mm and 1,400 mm deep, and vertical down to 75 mm from the bottom for the section that is less than 750 mm deep, except for the section occupied by stairs or a ladder.
O.C. 115-2013, s. 1.