Rough in plumbing basement

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Jefftra, Feb 22, 2021.

  1. Jefftra

    Jefftra New Member

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    Feb 22, 2021
    Location:
    Missouri
    Hello, I am hoping I can get some help with my basement rough in. When we bought the house we paid to have just a half bath rough in done. I am attaching some pictures to help. I know my toilet flange is the 4 inch. I popped off the caps on the 2 inch pipes. The middle pipe had no water in it so I poured some in and it drains right out. The pipe on the right had water in it, so it must have a p trap in it. So that doesn’t make sense as we are only supposed to have a half bath. The measurement from the 4 inch pipe to the pipe on the right measures 30 inch. There is no way the vanity can be for the middle pipe as it’s way to close to the toilet. Even more confusing is the 2 inch pipes do not line up, so I couldn’t even put them in the same wall. I feel the builder made a mistake. Any suggestions are much appreciated.

    CECD9BF9-1FC6-4A35-B63E-543E38CE9F96.jpeg
     
  2. Jeff H Young

    Jeff H Young In the Trades

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    nothing wrong with roughing in a full bath and not using the tub. however a toilet can't just go anywhere with no regard to walls or where the lav might go. Some discussion with builder should have taken place but I guess its just a half bath wherever? Your assessment sounds reasonable that the tub was far right and lav in middle. I'm not very trusting so I'd run hose down and a little more observation.
    The W/c (4 inch) looks to be farther than a 12 inch rough would be . If you take a 2x4 block and lay in long ways to the side of the lav as if a wall were there do you have between 12 1/2 to 13 1/2 inches ? if yes then your good j you can just gotta cap the one pipe below slab. If not within those numbers fir wall to 12 1/2. if you don't like lay out get jackhammer or go to builder with complaint
     
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  4. Jefftra

    Jefftra New Member

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    I will post a picture from another angle with measurements. The middle pipe is fine as far as the wall from back of toilet, but side to side no way to place vanity there. And with a trap apparently in the far right pipe, I can’t place vanity there.
     

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  5. Jeff H Young

    Jeff H Young In the Trades

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    you just turn tee to side and drill studs for lav its fine. You could use a 2 x6 wall that will give you a perfect 12 1/2 inch rough
     
  6. Jeff H Young

    Jeff H Young In the Trades

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    perfect rough with a 2 x6 wall 12.5 inches the tub drain close to 30 inches from tub (i know just a half bath) and the lav you turn tee to side and drill studs wherever you want center. Id say good to go!
     
  7. Terry

    Terry Administrator Staff Member

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    The middle pipe can arm over for the lav.
    A 1.5" trap arm can go 42" to the trap. That's a pretty common way of doing it.
    From left to right
    Lav, WC, Tub

    Water Closet is also called a toilet.
     
  8. Jefftra

    Jefftra New Member

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    Location:
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    To make sure I understand. I would come off the middle pipe with a tee out the right instead of straight out, extending 42 inches to make room for the vanity, then 45 degree to the vanity? The pipe to the right would be eliminated by cutting and capping off? I assume that can’t be used as the vanity since there is a trap there?
     
  9. Jeff H Young

    Jeff H Young In the Trades

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    I don't know where you want the lav ? point right, point left wherever you like. and no it doesn't need to be 42 inches that's the maximum if you have UPC plumbing code . the pipe on right gets capped if a vanity will be covering it you might just need to cap it off lower to floor otherwise it needs capping below floor. pretty simple. Are you doing this yourself ?
     
  10. Jeff H Young

    Jeff H Young In the Trades

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    just a half bath he is unhappy they roughed a full bath. hopefully clear now
     
  11. Jefftra

    Jefftra New Member

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    Feb 22, 2021
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    Ok this is starting to make sense. Here is a rough drawing of what I believe I need to do. Would I come out the other end of the tee to run my vent? Yes I am attempting this myself.
     

    Attached Files:

  12. Jeff H Young

    Jeff H Young In the Trades

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    the tee would be a santee it will be 2 x2 x1.5 the smaller being branch to side for lav. for w/c you need a clearance of minimum 15 inches to the side for a wall or sink cabinet thats a strict minimum .
     
  13. Jefftra

    Jefftra New Member

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    Ok thank you. Is there a maximum I can extend off that santee to the right? I seen the trap arm can be a maximum of 42 inches. Then place a 45 to the trap arm? I am going to assume the vent is going to be extended from the 2 inch pipe and go to the same venting as my other bathroom. I really appreciate your help.
     
  14. Jeff H Young

    Jeff H Young In the Trades

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    correct about the vent . the trap arm from edge of the vent measure along the pipe and 45 all the way to the wier of the trap under 42 inches is fine verify plumbing code if you have upc code this would be your standard if IPC code it can be longer
     
  15. Jefftra

    Jefftra New Member

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    I confirmed it is IPC in my area. Thanks for the advice.
     
  16. Jeff H Young

    Jeff H Young In the Trades

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    Don't know how much room for a vanity or what size your planning. looks tight unless I'm seeing a shadow and not a wall on right side from finish wall to center of toilet 45 inch min for 30 inch cab. , and 39 for a 24 inch cabinet
     
  17. Jefftra

    Jefftra New Member

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    Was thinking a 30 inch vanity, that is a piece of carpet on the right side. No walls are close to the pipes. Of course they put it right under duct work so that will not be a good ceiling height.
     
  18. Jeff H Young

    Jeff H Young In the Trades

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    never would have guessed carpet . looked like a wall or painted floor didn't make sense good that you got plenty of room. Why not full bath? adds appeal for resale . not huge cost depending on how its done
     
  19. Jefftra

    Jefftra New Member

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    Wouldn’t I have to break up the concrete and move the pipe to the right? It seems like the bath would not fit. The way I have it planned now, the vanity will be sitting over that pipe since I have to tee to the right.
     
  20. Jeff H Young

    Jeff H Young In the Trades

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    starting on Left Lav W/c Tub no reason to put lav on right except that is where you said you wanted it . and that you wanted a half bath
     
  21. Jefftra

    Jefftra New Member

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    Ok I finally get it now, I understand I can extend to the left to get on the other side of the w/c now. One final question. Is there somewhere I can look to get basic codes that I will need? I am sure I will still need to reference my pipe length maximum, slopes, spacing, etc. Thank you very much!
     
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