Raising sink drain pipes to fit new vanity plumbing area

[DiyBenny]

I have a dual sink vanity to install in my bathroom. The problem that I realize is the drain pipes coming from the wall are not high enough to fit into the vanity plumbing space and meet the p-trap.

I have attached some images of the plumbing and one sketch with 2 options of how I might go about solving the problem.

Option 1 - Install a new sanitary tee that is higher and route the drain pipes

Option 2 - Install a new sanitary tee that is higher and route the drain pipes and connect the old pipes to the new ones. The advantage I get out of this is that I can have the new pipe fitting (coming out of the wall to the p-trap) at any height without the water line getting in the way.

Suggestions or comments? Any other considerations ?

Thanks

 

[Terry]

The trap arms can grade at 2% ( 1/4" per foot )
That means you should open the wall and raise the fitting there, redrill the wall for new trap arms.

Either that, or install an AAV for each trap to break siphon. You may as well open the wall while you can though and replumb the lavs.

 

[Sponsor]

 

[hj]

The bottom drawing is the most complex, and dumbest, thing I have seen in a long time. Go with the middle one.

 

[Cwhyu2]

You can also use a slip joint extension tube and not have to do anything in the wall.
Never mind just looked at the pictures again did not see the shelf the first time.

 

[CountryBumkin]

Would be a lot easier to cut a hole on the cabinet shelf and drop the pipe there - rather than cutting up and relocating the piping in the wall? It looks like the pipe at the wall is below the shelve height.

 

[Plumber69]

Put your cabinet in place. Measure where your ptrap is going to be. Drill a 6 inch hole with hole saw.

 

[Terry]

It's pretty normal to raise the rough for the new cabinets with legs and shelving. The tops are higher and the lower part is raised.
The p-trap has that nice bend and hits the drawers if not raised. You can sometimes notch, but it's not as nice as fixing what you have in the wall.

 

[Plumber69]

It's pretty normal to raise the rough for the new cabinets with legs and shelving. The tops are higher and the lower part is raised.
The p-trap has that nice bend and hits the drawers if not raised. You can sometimes notch, but it's not as nice as fixing what you have in the wall.

Lots of my vanity hieghts are way up there to. I'm in the 3o inch range. Sucks when they don't know what there getting when you rough It in

 

[Reach4]

Lots of my vanity hieghts are way up there to. I'm in the 3o inch range. Sucks when they don't know what there getting when you rough It in

Does anybody ever put in 2 sanitary tees, one above the other?

I could picture a pair of santees that could take either a threaded plug or a threaded trap adapter. One could serve as a cleanout and the other as the trap arm connection. Perhaps both could be behind drywall with the expectation that one would be opened up.

I guess it would be too much for the sellers to label the vanities as to what height trap arms they accept.

 

[Plumber69]

You would have to vent one. Cheapest way is to hole saw where trap is going be

 

[Plumber69]

How often do you look under your your vanity and say wow good job