Basement Bath Rough in Layout/Framing
I am trying to finalize my basement finishing plans in the bathroom area. It is already roughed in, but I am having trouble determining the best layout and a couple other details.
The picture below is the area in question. The back left pipe is the soil stack (?), the front left pipe is a backwater valve access sleeve, the back covered area is the tub drain, the back right back pipe is a sewer vent pipe with air admittance valve, and the front right pipe is the toilet drain. The tub drain and vent run horizontal across the floor toward the soil stack.
Initially, I was going to frame out like figure A. The tub would be along the far wall, the toilet in the middle, and the sink on the near wall. However, from what I understand, the air admittance valve (AAV) must be inside the wall so this layout will not work. Also the toilet would be about 17" from the wall which is way too far. Thus, it seems like I will have to shift the walls over 3.5" to the left, meaning I will have to frame between the pipes on the left hand side, which allows the AAV to be inside the right wall (which I would frame with 2x4s. This also puts the toilet at 13.5" from the wall. This is shown in figure B.
Additionally, there seems to be no drain for the sink! Am I supposed to connect this to the drain for the tub, or do I need to open up the floor and add this?
Lastly, am I supposed to do anything with the Backwater Access Sleeve (besides making it accessible)?
Moved you to "Plumbing" for a better response, welcome to the forums!
I got some questions and comments--
I assume the big round circle is a shower/tub?
What's in the ground there?
AAV's should not be sealed tight in the wall. They need to breath, so it is not mandatory that they be installed in a wall.
A lav can be tied into the vent- pretty typical
Do you have a capped pipe in the ceiling above or close by?
The BW valve sleeve can be cut off flush with the finished floor. It does not have to be in a wall. Just don't cover it with flooring- needs to remain accessible.
Since the AAV is so close to the tub, wouldn't I want to have it in the wall and then open up some venting for it? Otherwise the AAV will actually be under the corner of the tub (and the toilet will be 17" from the wall).
I don't believe there is any capped pipe in the ceiling above. I have attached a picture of the piping. All of the tubing running to it is from the bathroom and kitchen area above it.
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