: : 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.