: Here's my challenge.

: We want to install a basement (full) bath and a kitchenette with sink.

: #1. May I use Air admittance Valves for each of
: these fixtures instead of running separate vent
: line(s)? (AAVs are code compliant in Ohio)

: #2. Re-drain lines. Which of the following would work
: best:

: Running separate branch drains - 1 (3") for the
: closet and another (2") for the tub, and
: lavatory. This method would place the water
: closet downstream from the other fixtures.
:
: OR

: Otherwise all fixtures would need to be
: rearranged on the floor plan, to keep the
: watercloset downstream from the others.

: The third option (sorry I have not done my
: homework - probably NOT an option -thought I'd
: ask anyway)

: Keep the watercloset according to plan but
: use a wall-mounted fixture and use four
: closets bends and about 22' 3"inch pipe
: keeping drain pipe sloped above the floor
: running the perimeter behind a wet wall
: until the tie-in point in the floor drain.

: This would keep the watercloset
: downstream from the other fixtures.

: This sounds so far-fectched, it
: probably is not permissable. Doesn't
: hurt to ask does it?

: Current stats: Bath and Kitchenette would
: be tied into 3" basement floor drain.
: This existing drain receives wastes
: from main floor Kitchen sink,
: dishwasher, washing machine, laundry
: tub as well as a lavatory, shower
: and water closet.

: This (existing) 3" drain system is vented
: above the watercloset 3" to the
: roof and the washing machine also has a 2" vent
: to the roof.

: Would the 3" basement drain handle the new four
: fixtures described above along with the present
: fixtures?

: Or would it be better to run a new (3")
: branch drain to the main cleanout
: (4" pipe)?

: Thanks again. Much appreciated! Please answer this question because I'm curious about the answer to the AAV question.