I am currently working on a bathroom in my basement. The few main problems that I am currently addressing include:
- venting the unvented shower drain
- venting the laundry standpipe on other side of this wall (was also unvented)
I am now playing with layout. Currently, the lav is too close to the toilet (maybe 12" clearance). If you were to measure from the center of the toilet forward, it is clear space, both the right side is blocked with the lav. In fact, the lav was the wall mounted type and it would hang over your left knee if you sat on the toilet (cover about 6" from the bend on my knee). Shower is getting a new drain line (with vent).
I am trying to decide which option is the best. Option 1 keeps the toilet and moves the lav to get 21" clearance. This puts the lav very close to the shower. It would be legal in terms of clearance (since the shower will have a sliding door and could be accessed from the right side). However, this option looks a bit weird.
Option 2 rotates the toilet and keeps the lav about in the center of the room. This layout looks best to me, but would block the cleanouts in the base of the stacks. The toilet could be removed when access was needed, though.
Option 3 also rotates the toilet and moves to the opposite wall. This still looks a little weird to me. Have to consider running the vent.
The inside dimensions are about 110"x48"
The main building drain runs horizontally parallel to the interior cinder block wall (right to left) about 14" from the wall, under the slab.
Current toilet is elongated bowl. I could move to a round bowl to gain a couple more inches if needed.
One sticky point is the exterior wall (brick + cinder block) is furred out with 2x2 and has 2" thick fiberglass batts compressed in this space. This is also on the walkout side out the basement, so is a true exterior wall. The toilet currently is pinned tightly to this wall. I believe it is a 12" rough-in, but would have to double check. Rotating the toilet would get the water supply line out of that barely insulated wall and I could add a stud wall in front of it for additional insulation.
Just wanted to see what yopu opinions were. This might go better in the Remodeling section, but plumbing is impacted, so I decided to put it here.