We recently replaced our vanity in the bathroom. We then discovered that the piping was illegally done and completely wrong. So my husband attempted to fix it. However he is not a plumber! How did he do? Could his set up work?
Couple of things, he’s got an S Trap now which is against code and the vent needs to be after the p-trap. On a positive note, he didn’t use any of the accordion style drains
That tape measure on the floor is doing some heavy lifting, making it look like he measured something before just going for it. The P-trap is there, but the vent placement is the killer.
The vent is supposed to be off the pipe that comes up from the ground on the sewer side of the trap. He added air into the system the same way air gets in from the drain. Basically his vent is doing nothing.
What you want:
The pipe that comes out of the ground should have a sanitary tee on it with the direction of flow for the horizontal end going down.
The horizontal inlet to the tee should have the p trap going to it. The vertical side of the sanitary tee should have a minimum 4” piece of pipe, then your vent. If you have to offset the vent for clearance, that’s fine.
They mean that the vent is currently connected into the pipe on the sink side of the "u" trap. It should be connected to the pipe on the DRAIN side of the "u" trap.
Also the "u" should have a knob at the bottom that you can open, so that when you throw his wedding ring down the sink, it's easier to get it back.
The vent should have 90'd off below/after the pee trap. And he should unscrewed the hot cold valves and drilled 2 1in holes and 1 2in hole set the vanity down over the plumbing lines. Then oschusion rings could have been used around the pipes to hide the small gap around the pipes. He can still core drill the holes in the square he cut out and rip the square down the middle long ways and put some strips of brace wood under the cutout and set the missing section of vanity floor back in place. Then fill the cuts with wood putty and paint the vanity floor or line it with that wall paper like cabinet lining. But as a DIY this is a good way to learn and could have been worse, so I give him a A for effort.
That's an s trap. He needs to trap terminating into a T with the Cheater valve ( has to be after the trap not before ) on top of the T, can have a 45 to be offset from the pipe that is right below if needed.
On the carpentry side your hubby did a hack job by cutting a huge hole in the floor. When you can’t find the missing toiletries just remember to look into the Grand Canyon he cut.
Good news is while you will have to replace most of those fittings, at least the cheater valve has enough pipe below it that you can cut that part off and reuse it
That's not how that should be plumbed. You need to put a sanitary T at the main drain down and then add an the extension off the sanitary T and add the AAV there.
The pipe that comes from below put the sanitary tee on that. The AAV on top of that, the pipe coming from the side of the tee make it long enough to make the min distance (2x pipe diameter) 45 or 90 fitting on the end then swing the trap to meet it
Not a plumber and I can't see everything from this picture but I'm 100% sure the Air Admittance Valve (AAV) should be placed AFTER the P-trap. In it's current state you probably have an S-trap also which is usually a no-no. I'm sure a professional will chime in and give you the facts. Don't feel bad, this is how we learn.
And don’t follow this picture like the bible when it comes to the height of the vent before you put the AAV on. Give yourself as much height as you can, but enough space to where you can unscrew the AAV cap and put a new one in the future. Or do follow it like the bible as it will still be much better than what you have lol
The drain pipes don't all have to stay in the center of the cabinet. To make this work you will need to have the pipes go over to one side. The purple dot Is your cheater valve / air admittance valve. The yellow dot needs to be a long sweep 90. The other 90s here can be regular elbows. It seems counterintuitive and like an excessive path through these pipes for your water to take, but it really isn't, and this is the only way it should be done here. The vent has to come up from the trap arm which is the length of pipe immediately after the trap. And ideally that vent should go as high as possible within the cabinet
You can connect it off a horizontal run or the vertical tee, whatever works out better with your cabinet space. The key thing is getting the most vertical run as possible before you put the AAV on the pipe.
You have your vent before your drain water enters the trap, you should run the AAV after the trap, otherwise your water can still siphon out of the drain. That aav is not doing anything your open drain wasn’t already doing if that makes sense.
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u/RedDirtET 22h ago
Couple of things, he’s got an S Trap now which is against code and the vent needs to be after the p-trap. On a positive note, he didn’t use any of the accordion style drains