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Old 10-04-2012, 09:11 AM   #1
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New bathroom plumbing

I just added an addition with crawlspace.
I am putting in a bathroom and not sure about the plumbing/venting.
We are allowed wet vents.

I have attached a drawing of what I am looking to do.

The toilet drain is a 3" pipe that slopes all the way to the septic tank.
The distance from the toilet to the 2" roof vent in the opposing wall is approx 7'

The sink would have a 2" vent(slightly angled) that extends up above it and over to the stack.
The shower drain would connect to the sink with a t fitting and then take a 45 to tie in with the 3" toilet drain at the stack vent.

Would this work or do I need an additional vent by the toilet or shower that would go up the wall into the attic and tie into the stack there?

Attached Thumbnails
New bathroom plumbing-bathroom.jpg  


Last edited by notbob; 10-04-2012 at 09:13 AM.
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Old 10-04-2012, 07:05 PM   #2
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the wye for the shower should be closer to the toilet. between that wye and the shower trap add another wye for a 2"vent in the wall behind the toilet and shower. you don't need both of the vents in the lav wall. you only need 1-1/2 inch for the lav drain but run 2 inch and reduce the vent to 1-1/2.
Attached Thumbnails
New bathroom plumbing-bathroomdiy.jpg  


Last edited by DannyT; 10-04-2012 at 07:13 PM.
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Old 10-05-2012, 07:58 AM   #3
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Thanks you for the reply!

We are in the process of laying out the bathroom.
After some discussion and measurements tonight, we decided to go with a different layout.
I attached a new pic.

The toilet will now be 2-3 ft from the lav drain.
The 2" stack that will exit the roof will be in the wall directly behind the toilet.
The shower will be approx 7' from the drain to where it could connect.

With those changes, how do I plumb this now?

Do I

1)tie the shower into the lav via a 45 and T and wet vent the lav (like in pic 2),

2) not wet vent the lav but still connect the shower with a 45 and T with the lav drain (like in pic 3)?

3) Other? Perhaps a wye for the lav, with a wye below it for the shower

For the connection between the lav and toilet, I was planning on a wye that the top will be the 2" roof vent, the right side will connect to the lav and then the bottom will be connected just above the toilet drain which will connect to the 3" main?

OR, do I need a seperate vent for the shower that goes up the wall behind it and connects in the attic to the stack but the drain still connects into the lav drain (like in pic 4)

I just want to get this right so I don't have gurgling, trap water loss issues, etc...

Thanks again!
Attached Thumbnails
New bathroom plumbing-newbathroom1.jpg   New bathroom plumbing-newbathroom2.jpg   New bathroom plumbing-newbathroom3.jpg   New bathroom plumbing-newbathroom4.jpg  

Last edited by notbob; 10-05-2012 at 08:20 PM.
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