I'm currently working on a bathroom remodel in which I'm adding a
tub and 2" drain line. Construction is slab on grade. I've cut,
broken up, and removed the concrete where the new drain line will run.
My question concerns how to tie the new tub drain line into an existing
2" shower drain. The tub waste and overflow will be about 10 feet
from the shower drain.
Is it acceptable to add a sanitary tee above the shower trap and bring
the tub drain line into the branch of the tee with the shower riser
coming up vertically out of the inlet of the tee? If this is
acceptable, would the tub still need a trap and vent?
If this is isn't a valid approach, can I tie the tub drain in
downstream of the shower's trap? I would then add a trap at the
tub's waste and overflow and would vent the trap, correct? Thank you
very much for your help on this issue.