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Thread: Connecting P-trap to drain for tub

  1. #1
    DIY Junior Member vinceliberto's Avatar
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    Default Connecting P-trap to drain for tub

    In the process of installing a bathroom in my unfinished basement. I have an existing rough in and have found the tub drain under the concrete. I have opened up a whole the size recommended per the instructions for my tub. The problem I have is that with the angle and location of the 2" drain I can not get far enough back on the drain to cut it to install the P-trap. My question is can I install two 90's out of the tailpiece from the tub and then the P-trap to be able to connect it further forward on the drain? I've attached a picture of what I'm talking about. Obvisouly I understand that my pick has a combination of 1 1/2 and 2" fittings, I just grabbed what I had sitting around to explain what I meant.

    Thanks for the help!
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  2. #2
    Journeyman/Inspector Inspektor Ludwig's Avatar
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    Looks ok to me. Good luck!

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    DIY Junior Member jc60618's Avatar
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    Here in Chicago code says that when a p trap is used on a bath tub it shall be directly below the tub overflow without any offsets. However I have run into this problem in a large hotel remodel were this was not possible and had to offset. Sometimes you just have to make it work. If your going to offset it and have room I would use two 45 degree elbows instead, that would make it easier to rod in the future. using two 45 will reduce the unecessary bend.
    Last edited by jc60618; 05-09-2010 at 08:22 AM.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    I would loose the nut on the p-trap and go with a solvent weld.
    Those nuts tend to break later.

    And if you can use 45's, that would be better.
    Is there no way that you can cut some pipe and line it up better?

  5. #5
    Master Plumber-Gas Fitter shacko's Avatar
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    On a GOOD basement rough-in a trap is included under the slab, did you look?

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Also, keep in mind that that 90 coming out of the outlet of the trap can point backwards....this would seem to nearly align with your overflow and drain connection. Depends on if you have a little offset available.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7
    DIY Junior Member vinceliberto's Avatar
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    Quote Originally Posted by shacko View Post
    On a GOOD basement rough-in a trap is included under the slab, did you look?
    I have about 2' exposed and all I see is a straight 2" section coming thru the hole I've made. I just assumed there is no trap. Could it be further back under the slab?
    Last edited by Terry; 05-10-2010 at 05:03 AM.

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    Unlikely...a trap should be directly underneath the drain.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  9. #9
    Master Plumber-Gas Fitter shacko's Avatar
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    Most rough--ins for tubs and showers in concrete have a box around them, I use a 8x12in for a tub and a 8x8in. for a shower, you will need something similar when it comes time to hook up, if you have 2ft. exposed down to the dirt, you probably don't have a trap and you have plenty of room for your hook-up.

  10. #10
    Moderator & Master Plumber hj's Avatar
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    Default drain

    You may be confusing us, but if you have 2' of pipe exposed, you should have plenty of room to cut it back so you don't have to make that offset.

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