Basement Bathroom Plumbing Rough In Diagram
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Discussion Starter · #1 ·
Hello,
I am working on finishing our basement and I am hoping to get some help with the bathroom plumbing the builder roughed in. I live in MN and the house was just built in 2018.
I attached some pictures of the plumbing rough in with some colored arrows pointing at different pipes.
The toilet drain pipe is 4", the 2 pipes next to it and the shower drain pipe are all 2".
Here is my best guess on what the pipes are based on the colored arrows.
Green Arrow: shower drain obviously - guessing I still need to add a P-trap to it because I dug around and couldn't see one?
Blue Arrow: Toilet drain.
Yellow Arrow: vent pipe coming from the shower drain under the slab. I am guessing this pipe needs to tie into the red arrow pipe and then run up to the ceiling and connect to the other capped pipe labeled with another yellow arrow?
Red Arrow: drain pipe for the sink which will be against the same wall to the right of the pipe.
I also attached a rough drawing that matches up the colored arrows to how I believe the plumbing needs to be finished. Ignore the pipe measurements in the drawing, I didn't draw it so the measurements don't apply.
If you agree or disagree I would love some other opinions!
Thanks!
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Being a recent construction any pipes below the slab should have been inspected as part of the original building permit and they should have had plans that would show you what is there. Any future inspections as part of new permits will reference the original an need to agree. Good time to talk with your inspector to be sure what you do to finish this agrees with what s/he wants to see.
Bud
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Your drawing shows three pipes from below grade, while the picture only has two. The sink will drain to the left into the pipe in the stud bay with the vent.
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The image labeled basement shows what appears to be a backwater valve in the other room? If so, this will be downstream of the bathroom and means your pipe layout is wrong.
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Discussion Starter · #5 ·
Your drawing shows three pipes from below grade, while the picture only has two. The sink will drain to the left into the pipe in the stud bay with the vent.
Thanks for the reply! The drawing isn't exact, it isn't mine, I found it online and thought it looked pretty similar but I know it isn't exact.
So the pipe on the right will be my sink drain and then I need to T the pipe on the left into that for venting?
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Discussion Starter · #6 · (Edited)
The image labeled basement shows what appears to be a backwater valve in the other room? If so, this will be downstream of the bathroom and means your pipe layout is wrong.
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That is exactly what it is; a backwater valve. What does that mean in regards to the pipes?
I think I confused people by posting that drawing. I didn't draw it myself, I found it online and thought it looked similar to my layout and just used it to try to understand how the pipes are connected below grade
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Discussion Starter · #7 ·
The image labeled basement shows what appears to be a backwater valve in the other room? If so, this will be downstream of the bathroom and means your pipe layout is wrong.
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I created a new diagram that I think better shows my thinking. The blue colors are the drain pipes and the green colors are the vent pipes. What do you think?
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I created a new diagram that I think better shows my thinking. The blue colors are the drain pipes and the green colors are the vent pipes. What do you think?
What is the black thing at the upper end of your blue line? The image is too small on my phone to tell. Is it a backwater valve? How do you know the drain line slope is as you have it drawn?
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Discussion Starter · #9 ·
I created a new diagram that I think better shows my thinking. The blue colors are the drain pipes and the green colors are the vent pipes. What do you think?
What is the black thing at the upper end of your blue line? The image is too small on my phone to tell. Is it a backwater valve? How do you know the drain line slope is as you have it drawn?
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Yeah, it's a backwater valve. I don't know the drain line slope is the way I have drawn it, but that is what I am trying to figure out, what piping belongs to what. The street is out to the left in that picture so I am just guessing on how I think it is.
Do you have a better opinion on the setup? I'm not very familiar with plumbing but if I can figure out how to finish the rough in I can do the work.
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Yeah, it's a backwater valve. I don't know the drain line slope is the way I have drawn it, but that is what I am trying to figure out, what piping belongs to what. The street is out to the left in that picture so I am just guessing on how I think it is.
Do you have a better opinion on the setup? I'm not very familiar with plumbing but if I can figure out how to finish the rough in I can do the work.
The backwater valve is downstream of the bathroom before it connects to the sewer line. Their use is to keep waste from backing into lower elevation plumbing.This leads me to believe your pipe comes from the valve to the bathroom.
The vents in the wall are shower and WC as you show, but underslab is different. It drains toward the valve.
Perhaps like this--
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As a plumbing inspector when we inspect residential undergrounds in my area we draw the underground upon approval on the back of the permit for future reference. If your lucky perhaps your plumbing inspector did the same.
Basement Bathroom Plumbing Rough In Diagram
Source: https://www.diychatroom.com/threads/basement-bathroom-rough-in.674111/
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