90° Elbows

(1)  Except as permitted in Sentences (2) and (3), 90° elbows of 4 in. size or less that have a centre-line radius that is less than the size of the pipe shall not be used to join two soil or waste pipes.

(2)  90° elbows of 4 in. size or less in sanitary drainage systems may be used,

    (a)   to change the direction of piping from horizontal to vertical, in the direction of flow,

    (b)   where a trap arm enters a wall, or

    (c)   to connect trap arms as permitted by Sentence 7.5.6.3.(2).

(3)  A 90° elbow that is part of the pre-engineered wastewater heat recovery system is permitted to have a centre-line radius that is less than the size of the pipe.

Article 7.2.4.3. Ontario Regulation 332/12 Building Code,   O. Reg. 332/12: BUILDING CODE (ontario.ca) © Queen’s Printer for Ontario, 2021