Haven't done this yet, but planning it. The pic shows an "x-ray" view of below-the-walkout-basement-slab drain and waste lines.
The 4" main at the R in the pic takes a 90 to run over and pick up a basement bath and laundry washer box.
The washer box is at the far L, and the 2" line coming up is vented with an in-the-box AAV. That 2" line runs over and picks up the trap arm of a tub-shower (trap not shown), which is vented a little ways down the arm with a rolled up san-t going to a 1.5" vent.
Behind that, you can see what happens along the run of 4" than comes off the end of the main. The end is a WC, a little down the line is a san-t rolled up with a 2" vent going up, and the lav sink is adjacent, revented up to the 2".
The stacks at the R going into the straight main are bringing down waste from a bath above.
If there is something wrong with this scheme, please let me know, as work (new construction) is planned to begin soon.
The 4" main at the R in the pic takes a 90 to run over and pick up a basement bath and laundry washer box.
The washer box is at the far L, and the 2" line coming up is vented with an in-the-box AAV. That 2" line runs over and picks up the trap arm of a tub-shower (trap not shown), which is vented a little ways down the arm with a rolled up san-t going to a 1.5" vent.
Behind that, you can see what happens along the run of 4" than comes off the end of the main. The end is a WC, a little down the line is a san-t rolled up with a 2" vent going up, and the lav sink is adjacent, revented up to the 2".
The stacks at the R going into the straight main are bringing down waste from a bath above.
If there is something wrong with this scheme, please let me know, as work (new construction) is planned to begin soon.