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Thread: Drain for basement bathroom

  1. #1
    DIY Junior Member Ze'ev Garber's Avatar
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    Default Drain for basement bathroom

    I'm remodeling my basement bathroom. There was toilet only installed in laundry room in enclosed cabin. I have cleaned the room and removed appliances, toilet, cabin.
    I'm splitting the room into 2 rooms - one for full bath and one for laundry with the wall separating both and 2 separate doors.
    I'll be using caroma rear outlet toilet and plug all drains (bath tub, sink, washer and toilet into one 4" pvc that will connect horizontally with old cast iron stuck.

    The problem is that I only have 3-4 feet between the back of the bathroom wall and existing stuck that I want to connect to. So pipe does 90 degrees and then has four 2 inches pvc pipes connected to it.
    Would it be an issue to contruct the pipe as on the picture? I'm just designing at the moment and have not connected anything yet.

    Thanks for your advise.

    Jeff.
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  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The line you are planning on connecting to is a drain...once a drain, it cannot become a vent. None of your new fixtures are vented. You got away with it when there was only a toilet there, but you can't add a sink and shower or tub in there without running a vent line properly. You have to run the vent line high enough in the house until that drain line becomes a vent, then you can tap into it rather than making a new penetration out the roof (unless that's easier).

    Note that dry fitting everything like that will ultimately end up causing you to recut lots of pipe or have to relocate everything since dry, the pipe won't fully seat in the tapered socket of the fittings - you'll lose maybe 1/4" or so at each socket - maybe more.

    Also, can't tell the elevation, but the pipe needs at least 1/4" per foot slope all the way - it doesn't look like there's enough, but the picture can be misleading.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Moderator & Master Plumber hj's Avatar
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    What you show so far is the "EASY" part. What you do from then on will determine whether it is an acceptable installation and whether it will have drainage problems.
    Licensed residential and commercial plumber

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    In the Trades Gary Swart's Avatar
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    What the previous replies are tactfully trying to tell you is that you can't just stick pipes together and call it a drain. Plumbing just isn't that easy. You need a plumber to make the proper connections and do the venting.

  5. #5
    DIY Junior Member Ze'ev Garber's Avatar
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    Thanks for your reply
    All of my fixtures will have individual vent coming from the ceiling
    Old toilet had cast iron 2" vent that was connected to 1 1/2" PVC pipe that goes to the roof
    I'm planning to connect all vents to it in the ceiling
    I'm more concerned with 90 degree elbow before connecting to the old stuck

  6. #6
    DIY Junior Member Ze'ev Garber's Avatar
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    Quote Originally Posted by Gary Swart View Post
    What the previous replies are tactfully trying to tell you is that you can't just stick pipes together and call it a drain. Plumbing just isn't that easy. You need a plumber to make the proper connections and do the venting.
    This is exactly why I'm asking a question here
    I'd like to understand if in 4x4 space I can connect all the fixture drains

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
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    What you have is a start. It's how it finishes that decides it.
    So far what you have to look at is fine.

    No-Hub couplings above ground do need to be shielded though to prevent shifting of the pipes over time.

    Edit
    A 90 bend on the horizontal, not on the trap arm, should be a long turn.
    You can get by with a M90 on a trap arm. However, you are always better off with the longest sweeps on horizontal.
    Like hj, I'm not sure what you have there on the 90.
    Last edited by Terry; 05-17-2012 at 09:25 AM.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    The elbow "appears" to be the correct one, but it is hard to tell because of the angle. The "Fernco" coupling would NOT be approved in this area for use inside the building. as far as the space is concerned, you could put it inside a 4" x 4" space IF you could fit the pipes into it.
    Licensed residential and commercial plumber

  9. #9

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    I see you stated you are from Ma., and, I don't know if you are aware of this or not, but, MA prohibits any plumbing work at all except by licensed plumbers, that is your state law. Just so you know, Jeff.
    Last edited by Cookie; 05-17-2012 at 06:40 AM.

  10. #10
    In the Trades Tom Sawyer's Avatar
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    Ah so you are expecting folks to follow the rules? Good luck with that LOL
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  11. #11

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    Nope, but, I would want to know.

  12. #12
    Plumber patrick88's Avatar
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    Yes and if you get caught you will be forced to have it all removed on your dime.
    I'm just starting to work with an old friend of mine to bring solar electric and hot water systems, wind turbines, Flex Fuel Boilers, batteries, hydroponic gardening, books, pellet grills and more. Also the parts for DIY installation.

  13. #13
    DIY Junior Member Ze'ev Garber's Avatar
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    Default Please take a look at the pictures

    I have dry fitted washer drain. Does this look right? Bathroom trap seems to be the biggest concern.
    What can be wrong with its shape?

    Thanks.

    And BTW I'll have this work inspected.Name:  IMG_0353.jpg
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  14. #14
    In the Trades Tom Sawyer's Avatar
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    Can't use a running trap on the tub in Mass. Your plumber should know better. Did he pull a permit?
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  15. #15
    DIY Junior Member Ze'ev Garber's Avatar
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    Default Alternative ptrap for bathtub

    Name:  IMG_0354.jpg
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Size:  48.8 KBCan you please give your opinion on this one as well

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