I have a bathroom vanity on the wall about 3 feet from where I want to put a bar sink. Is there a way to run the plumbing around this corner? I still need to put a couple studs on the corner for drywall. What is the proper way to layout the studs to run pvc around the corner.
Plumbing – How to run a sink drain around a corner in the basement walls
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This might not be the answer, but for reference here is a problem that can occur if the plumbing is not installed properly.
If you look at Fig. 3, this is what a proper drain looks like. You'll notice the orange line represents the water level in the system, the water levels out in the trap preventing sewer gases from entering the sink drain.
In Fig. 1, you can see what will happen if the drain line has to go up before meeting the main drain line. Again the orange line represents the water level in the system, and as you can see the water level is much higher in the drain.
Fig. 2 shows what could happen if the sink was installed lower than the rise in the drain line. The water would never fully drain from the sink, since it would require extra pressure in the system to push the water up the drain.
I wouldn't guess this is the issue in this case; since as you can see, if you opened the trap in this case you would have more water drain than what is typically in the trap.
In a perfect world Fig.1 and 2 would never pass inspection, but as we all know not all plumbing is properly installed and/or inspected. So this could possibly be the case in this situation (given the plumbing was installed by an amateur plumber), but it is doubtful. It would be more likely caused by a clog in the line.
The new stack in the top right should connect downstream of the toilet. It can pass behind the toilet and then run parallel to the side wall to the corner. This leaves you with a wet vent via the vanity that servers the bathtub and toilet:
Vanity New Stack
| |
| |
Shower ------------\| |
| |
| Toilet |
|/---- |
| |
| |
|/---------/
|
|
|
As a minimum, the wet vent would need to be 2” as shown on your drawing.
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Best Answer
Normally a wall corner like that is framed with a U structure comprising three studs, plus one stud on the adjacent wall, though some variations use just three studs total in the case of interior walls. The idea is that both inside and both outside corner faces have backing for drywall and corner bead. The plumbing passages are then hogged out using industrial hole saws which make quick work of the job.
In your case, you might place two studs at the inside corner, do your plumbing, and then block in the outside of the corner around the pipes. This would require you to cut holes through just two studs and avoids the need to cut across the wide face of one or more studs.
Here's a plan view:
You'll want to install protective steel "nail plates" along each stud where pipes pass through to prevent damage from drywall fasteners.
If you find that it's difficult to get a single elbow to make the corner, use two and orient them vertically. The first bends down and the second back to horizontal, with a 90 degree swivel between them and the vertical drop centered in the wall intersection. This puts the curve of each elbow in a single wall plane, give you more room to work (assuming you have height available to make a short drop). One could be a street bend to eliminate the section of pipe between. This technique also allows you to create virtually any angle when standard fittings don't meet your needs.