The Ontario Building Code | Ball Tests
7.3.6.7. Ball Tests
(1) Where a ball test is made, a hard ball dense enough not to float shall be rolled through the pipe.
(2) The diameter of the ball shall be not less than 50 mm where the size of the pipe is 4 in. or more.
7.3.7. Testing of Potable water Systems
In Plain Language
A ball test checks that drainage piping is free of obstructions or excessive offsets by rolling a dense ball of a set minimum diameter through the pipe and confirming it passes through unimpeded.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.