basement bathroom rough in - pipe routing pictures

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Old 10-24-13, 07:22 PM
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Cool basement bathroom rough in - pipe routing pictures

Hello,

Looking to rough in a bathroom in my basement. House is in MN and was built in 1995 and already has a bathroom roughed in from the original build (I assume). However, the rough in is out in the open and I want to move it closer to the wall. Here is a picture of the current setup and pipes. (I have kraft paper hanging up to simulate walls).

You can see the existing rough in. It sits toward the center of the room. I want to move it back towards the wall that faces the street.
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Of course without looking under the slab it will always be an assumption, but would it be a good assumption the way I have drawn the pipes under the slab? I'm assuming they all connect together and then exit the house towards the street.
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This is the proposed layout of the bathroom. The room will be approximately 5' by 8'
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My plan is to break up the slab (noted by thin green line) and tee into the assumed under slab waste line for both the shower and toilet connections. A new tee will be put in above slab for the sink drain (probably in pipe B where the existing sink drain fitting is)
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First question:
What is the strategy when splicing the new toilet and shower drain lines into the under slab waste line? Can I tee in anywhere? Do I have to be spliced a certain way with respect to the vents? Do I need to have a 4-way tee and tee in exactly in where the current vent lines are? (labeled 1 and 2)

Second question:
Can I just cut off and cap the under slab waste lines that are running to the existing rough in shower and toilet?

Third question:
Pipes are all ABS. I was planning to make the new tee connections by cutting the existing pipe and gluing in the new fittings with ABS glue. Is this the proper way to do it?


Thanks for any input,
Joe
 
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  #2  
Old 10-25-13, 05:59 AM
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Hi Joe. It looks like you've found yourself quite a project!

I wouldn't assume the pipes are set up under the slab the way you sketched them. I would think they are they are actually at a diagonal, from the right 3" to the cleanout with the other drains connected in to that diagonal. 90 degree fittings are avoided underground whenever possible. Of course, it all depends on how the original plumber thought would be the best layout.

That said, your plan to start breaking up along your green line is a reasonable start. You may have to expand the size of your hole once you get into it, or maybe not.

You'll want to use wyes (or combo wyes) for the connections to the lateral. Once you get it dug out, I'd suggest taking a couple pictures and posting them here to let the experts ensure your plan is sound. Overall, it sounds good - but DWV design still occasionally stumps me Also, you could simplify the venting a little bit too, but it depends on how it's actually laid out.

As for gluing ABS, I'd agree that's the way to go. You'll probably need to use no-hub couplings at the beginning and end.

Good luck!
-Mike
 
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Old 10-26-13, 09:28 PM
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Mike, thanks so much for your comments.

I broke up the floor and this is what I found

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Now the question, how can I run the drain and vent lines for the shower and toilet? Can anyone sketch in a diagram from one of my pictures?

I can pretty much modify the vent tubes any way necessary since they are currently only there to vent the existing rough in which I won't be using.

Thanks
Joe
 
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Old 10-27-13, 07:53 AM
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Im not sure why your moving anything... Why did you not just build the wall where the pipes are, and leave it as is?

At any rate you will need to expose all the pipe to modify.

Are you moving pipe A or B?
 
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Old 10-27-13, 08:38 AM
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Hi Mike,
I am relocating the waste drains for the shower and toilet because where the are located currently is right in the center of the room. I am hoping to not have to move any of the pipes above slab, just install drains in the areas I want.

thanks
Joe
 
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Old 10-27-13, 11:03 AM
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OK here is a bit more info and my current plan. Feel free to let me know your thoughts.

This is a closer up photo to show how the other line connects with the 3" horizontal pipe

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Here a game plan I was thinking of. Take out the vent and line (1) that was running to the previous shower rough in. Cap it off

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Then splice in connectors (not sure of the name or if they exist) that will allow connections for both vent lines and drain lines running to the toilet and shower

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Thoughts?

thanks
Joe
 
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Old 10-27-13, 11:21 AM
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No your doing it all wrong... Give me some time later to draw you up something....
 
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Old 10-27-13, 07:45 PM
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OK I think I may have it. How does this look?

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Old 10-28-13, 06:13 AM
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Your updated drawing looks much better - but wait for Mike (Lawrosa). He's much better at DWV design than I am
 
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Old 10-28-13, 06:28 AM
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Pipe A has waste from upstairs right?

What flows in the larger pipe B? The smaller one C is a vent yes but they run up together. Do they tie in together somewhere?


 
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Old 10-28-13, 08:03 AM
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Hi Mike, here is a picture of the pipes as they go up.

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Pipe C has branches D and F. D runs over and is a vent for the floor drain in the basement. F runs up through the floor and I *think* it runs up to the 2nd floor and is a drain for the 2nd floor sinks for both master and guest bathrooms. I would also guess it also vents through the roof.

Pipe B has a branch E and then continues as run G. Branch E I am fairly certain is connected to the drain for the main floor bathroom sink. Branch G I believe connects to the toilet for the main floor bathroom toilet.

Pipe A connects upstairs and connects to the drain for the main floor kitchen sink, and also I believe the 2nd floor guest and master bathroom toilets. Possibly also the 2nd floor guest and master bathroom showers?

How can I verify for certain what these really run to? Should I run water down the drains and flush the toilets individually and listen and feel the pipes?


thanks for any insight,
Joe
 
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Old 10-28-13, 08:43 AM
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OK thats a big mess. You may have issues. Lets concentrate on one pipe that is important. That is pipe C...

Pipe C cannot have anything flowing down it... If it is to be used as a vent for the downstairs bath period!!!

The first Tee on line C is upside down. That tells me line D is a vent... But where does line D go exactly and how is it hooked up... This is important...

Line C should be dry all the way to the roof. Now what and where does line F go.. This is important too!!!!

You need to be exact here or you cannot use that as a vent. It would seem the plumbers may have been novices and I am surprised that plumbing passed any kind of inspection...

Forget all other pipes for now...

But just a note where that sink arm is stubbed out on that 3" line B cannot be used. Water tuns down that pipe and its a wet vent...
 
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Old 10-28-13, 09:16 AM
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I will check the pipes today for where they lead. I am planning on running water down each individual fixture one at a time and feeling and listening to the pipes to find out where it runs. Is this the preferred method?
 
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Old 10-28-13, 09:20 AM
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Is this the preferred method?
Probably the only method if you cant physically see the pipes.......
 
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Old 10-28-13, 07:53 PM
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I have done the detective work and it was fairly easy to tell what pipes are connected to what. I ran water from every waste line in the house.

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Here is the overall layout now for your reference

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What, oh drain gods, is your recommendation?


thanks
Joe
 
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Old 10-30-13, 05:39 PM
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Does anyone have any comments?
 
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Old 10-30-13, 05:49 PM
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Sorry missed your reply. Im looking now....
 
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Old 10-30-13, 06:04 PM
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Are you jack hammering more?
 
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Old 10-30-13, 06:10 PM
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And how it that a vent for the floor drain D ? Is the floor drain above that???
 
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Old 10-30-13, 08:21 PM
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I am hoping to not have to jack hammer any more. Here is what I would like to do:
[ATTACH=CONFIG]20259[/ATTACH]

The floor drain is in the basement as well, about 12 feet from where I have dug up the slab. It's also the vent for my basement wash basin. The drain pipe for these must connect to the main exit pipe between the clean out and where pipe B comes up through the cement.
 
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Old 10-30-13, 08:43 PM
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Show me a pic of the hole as it is with no cut and paste ...

You cannot use that stub for the sink on pipe B..
 
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Old 10-30-13, 08:56 PM
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You cant tie in like that with TY's.. You need to expose the toiler because that needs to be cut out...

You need to do away with all that top pipe in the hole. Take the hole back to pipe B..

You will need to replumb all from that main line A.
 
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Old 10-30-13, 09:09 PM
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Far easier to put toilet on left. You can do the toilet where you want but just need to get fancy with the piping...

Connections must be Y's.. No sanitary tees...


Here is a rough drawing...


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