675 IAC 15-2-56 Size of drainage piping

Sec. 56. Fixture Load. Except as provided by 675 IAC 15-2-52, drain pipe sizes shall be determined by the type of fixture and the total number connected to each drain. (1) Fixture Unit. A one and one-half inch (1 1/2") minimum diameter piping shall be required for one (1) and not more than three (3) individually vented fixtures. (2) Fixture Unit. A two inch (2") minimum diameter piping shall be required for four (4) or more fixtures individually vented. (3) A three inch (3") minimum diameter piping shall be required for toilets. (4) When a combination of two (2) or more water closets, sinks, showers, urinals, or clothes washing equipment are installed, the Indiana plumbing code shall apply for mobile system-commercial transitory plumbing systems.