Bathroom- Converting single vanity to double

[NewJerseyJC]

Hi all. Hope someone can help me with this bathroom remodel.

- Converting a single vanity to a double vanity.
- The problem is that the new vanity has drawers in the middle (between both sinks) and cannot connect two "P traps" underneath.
- So looks like I need to change the plumbing in the wall. A pic of the existing pluming is attached.
- I was thinking about doing the following:
- Putting in a T to the left of the existing drain
- Cutting pipe and inserting 1 1/2 pvc to the right of the T
- And then putting in an elbow to the right of the existing drain.
- This would then give me two drains to connect two "P traps" to.
- Existing drain would obviously be eliminated by putting in the T, the 1 1/2" pipe and new elbow.

So will with work? Or are there other considerations and/or concerns? Any help would be greatly appreciated.

Additional info:
- Current plumbing is 1 1/2" pvc with one drain.
- Vanity is 5' long. The distance between the sinks is 33" on center.
- Local plumbing code is based on "2006 National Standard Plumbing Code" but its all greek to me here's the link http://phcc.files.cms-plus.com/Depts...stratedWeb.pdf

[Master Plumber 101]

That will work. Put a san tee at first connection and a 90 at your second connection. You should try to have the water line's piped to the proper location also.

[Dunbar Plumbing]

NO.


You cannot inline traps.

Find your center of the double bowl vanity, use a cross-tee with a vent going up the center and back towards the vent stack.


You already have a trap arm that's too long for most standards by code. 3' 6" I believe is max on 1.5".


My state follows the NPC.

Max distance from that vent in the center would be 1' 6" which is doable.

[Redwood]

That will work. Put a san tee at first connection and a 90 at your second connection. You should try to have the water line's piped to the proper location also.

Lots of things wrong with that idea!
A sani-tee laying flat...
Venting...
Sheesh!

Is that allowed in Wisconsin?

Whats next flex traps and extensions?

[Redwood]

New Jersey uses the National Standard Plumbing Code/2006

I am not familiar with it!

[hj]

NO CODE allows a five foot 1 1/2" arm. And you cannot install the tee that way on any arm, much less a 1 1/2" one. The water flowing past the tee can create a venturi effect and compromise the trap seal. As a practical matter, there is almost no way to do what you want to with that drain and do it legally or properly.

[Master Plumber 101]

NO CODE allows a five foot 1 1/2" arm. And you cannot install the tee that way on any arm, much less a 1 1/2" one. The water flowing past the tee can create a venturi effect and compromise the trap seal. As a practical matter, there is almost no way to do what you want to with that drain and do it legally or properly.

Vent to trap by means of a San tee.@ 1/4" per foot 5'82.31-1 Wi state code. And yes you can tie the waste in when you common vent like that.. if your local code permits. I can't help everyone else does it backward's.

[hj]

The key words are 'if your local code permits', which is seldom the case for a configuration such as this. Especially with a 1 1/2" arm. I guess since WI allows pedestal traps under the floor they allow almost anything, must use the IPC or a derivative of it.

[Master Plumber 101]

The key words are 'if your local code permits', which is seldom the case for a configuration such as this. Especially with a 1 1/2" arm. I guess since WI allows pedestal traps under the floor they allow almost anything, must use the IPC or a derivative of it.

You can countinue to talk about the pedestal trap under the floor, but I have yet to install one. I will look at the upc and start picking that apart.

[Redwood]

I will look at the upc and start picking that apart.

You are in for a tough time!
You might do better trying to pick apart the IPC!

Your pedestal sink with the trap under the floor can be viewed here... Page 107 AKA page 19 of 90 in the PDF.
http://www.legis.state.wi.us/rsb/cod...omm082_app.pdf
Your code is unlike that of any other state in many aspects. As a rule we try to give advice that applies under most codes.

[NewJerseyJC]

NO.
Find your center of the double bowl vanity, use a cross-tee with a vent going up the center and back towards the vent stack.

Ok. Forget about the picture I posted which shows what this currently looks like. I am attaching 3 figures of some scenarios. Let me know what you think. I think Figure A is what you were getting at. Figure B was just a thought and Figure C I'm thinking is last resort.

[Redwood]

Figure C with a double fixture fitting would be correct.
A cleanout above the double fixture fitting would be good also.

[hj]

C is the correct one using the proper fittings. One problem is that your existing drain arm is too high to do it that way, which is why I said there is no way to do it properly given your configuration. figures A & B both still have the right hand sink flowing past an unvented left hand drain.

[Master Plumber 101]

It would be legal to connect as original pic posted if you lived in Wi. I guess we are the only one's who figured out how to run plumbing efficiently.

[Rich H]

I'm no expert, but I live in WI and have read the code. Pretty sure san-tee cannot lie like that, only to be used in vertical applications similar to UPC - IPS says the same I'm assuming? 101 what code are you reading, COMM8X????

Would figure A work? Probably, the chances of a venuturi effect emptying the left trap are small, esp. with the vent in the right spot now. But, code is code.