Move drain off vent

[robkeith]

Good day,

I am remodeling a bath and would like to move the sink drain from it's current location (where it's coming out of the wall through a cut in the side of the vanity) so that it comes out of the same wall as the supply lines). In the picture attached, you'll see the current layout where the trap pipe is attached to what I presume is the vent. I want to:

1) cut the ABS vent pipe above the connection to the drain pipe
2) cut the ABS pipe just past the elbow in the floor
3) use a Fernco to attach PVC that goes from the vent pipe, down into the floor to a "T" in the floor where you see the elbow. The "T" would then connect the vertical vent pipe, the new drain, and the plumbing going to the rest of the house.

Will that drain properly if I pull it off the direct vent and will it be to code?

Thanks,
Rob

[Jerry Peck - Codeman]

First, a few questions and comments:

1) The studs and plate in the wall where the vent is now looks to be larger (2x6?) than the wall where you want to move it to (2x4?) - is that correct?
- The pipe might not fit in that wall.

2) Is that 1-1/2 inch or 2 inch pipe for the vent and waste drain?

3) If everything physically fits in the other wall, you will need to run a vent up from the sink drain, around the corner, and over to reconnect with the existing vent (or use an AAV if allowed in your area, some AHJ do not permit AAVs to be installed) as you need to vent that sink drain.

4) There may be some other options, depending on distance, pipe size, stud size, etc.

5) If you did the "tee" below the floor, you would not be allowed to use a "sanitary tee" there, you would need a wye and an 1/8 bend (or a single combination wye and 1/8 bend fitting). Sanitary tees are made for changes in direction from horizontal (the drain) to vertical (the waste drain and vent going up), not for horizontal changes in direction as you describe.

[robkeith]

[Jerry Peck - Codeman]

[robkeith]

[Jerry Peck - Codeman]

Check with the building department about the AAV before you start the work, otherwise you may find out after doing all the work that you have to remove or change all your work at the time of your inspection - not something you want to find out then.

The AAV would be mounted in the cabinet under the sink.

AAV rarely fail when installed properly, and they are required to be accessible for replacement if needed. They also require ventilation (they allow air in, but not out), thus they are not to be sealed up in a wall, and a cabinet allows sufficient ventilation.

If you measured the outside of the pipe at 2 inches, the pipe will be 1-1/2 inch pipe (pipe is measured inside diameter). Hold that Fernco next to the pipe and see how much larger it is.

Also, what state are you in? Some states have licensing and require licensed conductors when doing work for others - and that is essentially what you are doing being as you are planning on selling it. Some states require the use of licensed conductors if sold or rented, or offered for sale or rent within one year of completing the work ... I.e., you did the work for others.

[robkeith]

I have a message into the building dept re: the AAV. I read the code and it's not terribly clear.

I'm in Virginia (Fairfax County), so good to know about the license contractor possibility. Are you familiar?

Thanks,
Rob

[Jerry Peck - Codeman]

[robkeith]

Wow, terrific info!!! Thanks!