Vent grouping

[imported_krmereness]

I have a bathroom that has a toilet, tub/shower combo, and vanity sink all within 6' from the main waste return of the house. Can I use the stack on the main waste return to vent all of these? Also, do I have to vent each on then run them into the main? Thanks.

[Wgoodrich]

IRC, P3111 states that a bathtub is not allowed to use a waste vent system.

IRC P3107

A common vent is only allowed to serve two trapped fixtures each on the same floor of home. [lav & tub].


Common venting design would be your waste vent for your stool and a branch vent off your lav to serve lav and tub.

Hope this helps

Wg