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Old 05-07-2019, 07:41 PM   #1
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P-trap for this pedestal sink?


I am installing a pedestal to get my bathroom functioning. My plan is to build a cabinet for a vessel sink eventually. The tail of the sink and the waste pipe are very close together. The guy at the Ace Hardware suggested an S-trap. When I mentioned it was not code, he asked if it was going to get inspected, which it is not. Is there a way to put a p-trap in a place where the spacing is this tight?
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Old 05-07-2019, 07:45 PM   #2
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Re: P-trap for this pedestal sink?


Put the trap below the floor.
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Old 05-07-2019, 08:39 PM   #3
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Re: P-trap for this pedestal sink?


I'm pretty sure you need to vent this sink. But maybe you all don't vent sinks in your state. And do not put the trap under the floor that is not to code. May I ask why your pipe was not in the wall? Please wait until a UPC plumber can help you. But an S Trap is not an answer that is why the guy works at home depot.

Last edited by Ghostmaker; 05-07-2019 at 08:43 PM.
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Old 05-07-2019, 10:39 PM   #4
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Re: P-trap for this pedestal sink?


Quote:
Originally Posted by Ghostmaker View Post
I'm pretty sure you need to vent this sink. But maybe you all don't vent sinks in your state. And do not put the trap under the floor that is not to code. May I ask why your pipe was not in the wall? Please wait until a UPC plumber can help you. But an S Trap is not an answer that is why the guy works at home depot.
The rough plumbing was installed by a professional plumber, mostly at my direction for what I planned, errors might be my fault, but I think he thought it might be code. Below this bathroom is the garage and I had removed the garage ceiling sheetrock to accommodate this bathroom and likely wanted to avoid any more sheetrock disruption. If I remember at the time the sheetrock was removed in this room at this time so the drain could have been in the wall.

I am not sure what you mean by a vent but there is a roof vent about 6 feet away in the next rooms wall.
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Old 05-07-2019, 11:48 PM   #5
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Re: P-trap for this pedestal sink?


do you have attic above?
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Old 05-08-2019, 01:10 AM   #6
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Re: P-trap for this pedestal sink?


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Originally Posted by Nealtw View Post
do you have attic above?
No attic.
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Old 05-08-2019, 08:54 AM   #7
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Re: P-trap for this pedestal sink?


I'd recommend to stop taking advice from the hardware guy and also from the plumber who thought it "might be to code".

Maybe advance your plan and go to the cabinet sink now.

The roof vent you mention is likely not a plumbing vent, can you post a picture?

Since you are in a non-inspected area (or are you just not getting an inspection?), you might get by with an air admittance valve (AAV).
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Old 05-08-2019, 11:56 AM   #8
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Re: P-trap for this pedestal sink?


Quote:
Originally Posted by daveb1 View Post
I'd recommend to stop taking advice from the hardware guy and also from the plumber who thought it "might be to code".

Maybe advance your plan and go to the cabinet sink now.

The roof vent you mention is likely not a plumbing vent, can you post a picture?

Since you are in a non-inspected area (or are you just not getting an inspection?), you might get by with an air admittance valve (AAV).
This bathroom butts up against the master bathroom which is unfinished I am positive there is a roof vent 6 feet away for plumbing.
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Old 05-08-2019, 02:08 PM   #9
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Re: P-trap for this pedestal sink?


Quote:
Originally Posted by Photobug View Post
This bathroom butts up against the master bathroom which is unfinished I am positive there is a roof vent 6 feet away for plumbing.
Could you go up thru the wall and get to a joist space to get to that vent.
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Old 05-08-2019, 03:10 PM   #10
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Re: P-trap for this pedestal sink?


Quote:
Originally Posted by Nealtw View Post
Could you go up thru the wall and get to a joist space to get to that vent.
No it is 6 feet away. This is all temporary until I can build the cabinet for this space. I ran into a different problem the faucet that came with this sink leaks. That is my first item to repair.
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Old 05-08-2019, 03:30 PM   #11
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Re: P-trap for this pedestal sink?


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Originally Posted by Photobug View Post
No it is 6 feet away. This is all temporary until I can build the cabinet for this space. I ran into a different problem the faucet that came with this sink leaks. That is my first item to repair.
good luck
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Old 05-08-2019, 03:31 PM   #12
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P-trap for this pedestal sink?


Looks like a 2 pipe. Cant tell if its plastic or cast iron.

Is the vertical spacing too tight or the horizontal?

If vertical cut the black pipe to size.

If horizontal space is tight maybe this flexible ptrap will work. You can cut that long white tail piece to size.


Either way you need to put a sanitary tee on top of that vertical pipe which you can connect your ptrap to.

On top of the sanitary tee put an air admittance valve.

As others have suggested the pipes should be tucked in a wall and a vent pipe should eventually replace the AAV.

If you cant tuck the pipe into the wall build a chaise around it.




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Last edited by jaketrades; 05-08-2019 at 03:39 PM.
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Old 05-08-2019, 04:09 PM   #13
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Re: P-trap for this pedestal sink?


Quote:
Originally Posted by Ghostmaker View Post
And do not put the trap under the floor that is not to code.
Any particular reason that would not be to code?
I put a P-trap below the floor on a pedestal sink once. Sure Vent right next to the trap, full access from basement. Never had an issue with siphoning of the trap.
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Old 05-08-2019, 04:16 PM   #14
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P-trap for this pedestal sink?


Quote:
Originally Posted by chiraldude;
Any particular reason that would not be to code?

I put a P-trap below the floor on a pedestal sink once. Sure Vent right next to the trap, full access from basement. Never had an issue with siphoning of the trap.

The vent pipe needs to connect to the vent stack 6 above the flood level of the fixture. Roughly 42 IIRC.



Now if you ask why 6 above ... Id have to google it.

Or someone here may know what the logic is.



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Last edited by jaketrades; 05-08-2019 at 04:24 PM.
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Old 05-08-2019, 04:23 PM   #15
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Re: P-trap for this pedestal sink?


Sounds like another example of code written to handle rare, worst case scenario not everyday situations.
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