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Old 01-06-2017, 07:41 AM   #1
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Rough in mysteries


Hello everyone,

I finally decided to add a bathroom to my basement and luckily I had the rough-in plumbing included. I am a little confused because I see the toilet rough-in and the sink rough-in plumbing but I only have one more which is a 4" pvc coming from the ground(picture attached) but I am confused on how to attach this to a shower base? do I have to cut it and buy an adapter(4" to 1 1/2") or do I have to break into the concrete and convert it to a p-trap? any advice would be appreciated.

Thanks,

Job
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Old 01-06-2017, 09:14 AM   #2
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Re: Rough in mysteries


Welcome to the forum job1243. Can you give us a shot from further back so we can see all the rough in? 4" is not normal for a shower rough in. Usually there is a blocked out section of slab with a 2" pipe.
Edit: are you sure thats not the toilet?

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Old 01-06-2017, 12:27 PM   #3
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Re: Rough in mysteries


Check to see if the center of that 4" pipe is a little over 12" from the wall.
If it is that's the toilet stub out.
Showers are always 2" not 1-1/2, or 4" as you suggested.
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Old 01-06-2017, 02:06 PM   #4
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Re: Rough in mysteries


I was able to clear all the clutter inside of it and saw that there was another pipe in it, does this help identify what it could be? I'm hoping its for a shower because the other drain in the ground(Second pic) looks like it is for the drain.

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Old 01-06-2017, 02:35 PM   #5
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Re: Rough in mysteries


The 2nd pic is the closet flange to mount a toilet on.

Apparently they used a 4" pipe as a sleeve. That sleeve would not be helpful at all for hooking up a tub, but the drain pipe looks to me like it might be 1 1/2" which is no good for a shower drain.

Can you post a wide angle shot of the entire bathroom set?
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Old 01-06-2017, 07:48 PM   #6
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Re: Rough in mysteries


Any idea on how the so called plumper was that did this job?
None of that work looks right.
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Old 01-06-2017, 10:37 PM   #7
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Re: Rough in mysteries


Some locals, at least in Cali., require a sleeve through SOG. It is supposed to be filled/sealed after hookup.
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Old 01-06-2017, 10:39 PM   #8
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Re: Rough in mysteries


Run a snake down... you should be able to feel/tell if a P trap is there.
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Old 01-10-2017, 12:04 PM   #9
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Re: Rough in mysteries


Thanks for all the suggestions everyone, attached is an overview of how the bathroom is set up. I'm pretty sure that the hole in the floor is the toilet flange and the 1 1/2 inch pipe on top of that is the drain for the sink, the only thing that is still a mystery is that 4 inch white pipe with the 1 1/2 inch pipe in it coming from the ground, I even got a plumber who had no idea what it was. Trying a snake to see if it has a p trap is a great idea I will try that, thanks.

My only challenge is the shower drainage, I'm trying not to break the concrete. What im thinking of doing is Teeing into the 2" drain pipes behind the toilet flange in the pic and building a shower stall on a 6" elevation and run the plumbing under that for the shower.
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Old 01-10-2017, 12:16 PM   #10
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Re: Rough in mysteries


I had a house with an elevated shower stall and, believe me, it sucked.

Break out the concrete and do it right. Drill a series of holes along both sides of the trench and get a demolition tool. It really is easier and less work than you imagine.
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Old 01-10-2017, 10:35 PM   #11
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Considering the crooked pipes and the closet flange, the original plumber may not have been the most careful on the underground work. Possibly there is a tub or shower box which was placed too low and a skin of concrete is hiding it. I still have no idea why the sleeve, though. Is the inner pipe capped or open? If it's open and there never been a sewer smell from it, it might not even be attached to the main sewer..

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Old 01-11-2017, 04:43 AM   #12
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Re: Rough in mysteries


yes, it is capped.
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Old 01-11-2017, 05:51 AM   #13
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Re: Rough in mysteries


I would say to cut the 4" sleeve flush with the floor so you can start to investigate. You could drill a hole in the cap to run your snake thru. If you get some nice perfume smell coming up usually accompanied with a breeze, you're probably good. Check for the trap and Bob's your uncle.
1-1/2" will work for a shower. It's accepted in our area for a single shower.

I don't believe you're at the trench the floor or start building elevated boxes stage yet.

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