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Thread: 2" shower drain change in direction

  1. #1
    DIY Junior Member AnimalHungry's Avatar
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    Default 2" shower drain change in direction

    Hi - this is my first post here, and plumbing is totally new to me, so go easy

    As part of my bathroom remodel I'm installing a dual shower with a 2" drain. I want to use the existing 3" drain from the w/c that I removed and have currently capped off. The issue is that my new shower drain will be coming from 180 degrees in the opposite direction (from the left on the photo). I though the easiest thing to do (which may or may not be the best option) would be to chop off my 3" end cap and replace it with a wye and one or two bends to change the direction back towards the new shower drain per my (terribly drawn) annotations on the photo. I'd then cap off the wye on the right side.

    I understand that anything more than a 135 degree horizontal bend requires a cleanout (which I of course want to avoid as this will be under the tiled floor), but if I use a wye angled 45 degrees off vertical and then a bend or two would that enable me to avoid having to add a cleanout?

    I'm also open to any other suggestions.

    Cheers
    Simon
    Name:  Proposed DWV for shower.jpg
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    Looking at the photo, I have absolutely NO IDEA what you are trying to do, although it does not look "legal".
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member AnimalHungry's Avatar
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    Quote Originally Posted by hj View Post
    Looking at the photo, I have absolutely NO IDEA what you are trying to do, although it does not look "legal".
    Ha ha! Thanks for looking though. I thought long and hard about this last night and have decided to cut out the 3" wye and replace it with a new one pointing towards the new shower drain (180 degrees from what it is now). Then I'll connect two new 2" 90 degree street bends on top for the vent. I think this is by far the more elegant solution than trying to make the shower waste do a 180 degree switchback.

    I'll post a photo of what I'm gonna do when I have all the new fittings.


    Cheers
    Simon

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    I don't know how the toilet was vented, but the shower will need a wye fitting for the vent on the horizontal within five feet of the trap.
    The vent comes off the top of the trap arm.

  5. #5
    DIY Junior Member AnimalHungry's Avatar
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    Quote Originally Posted by Terry View Post
    I don't know how the toilet was vented, but the shower will need a wye fitting for the vent on the horizontal within five feet of the trap.
    The vent comes off the top of the trap arm.
    Thanks Terry. The toilet was vented by the 2" pipe you see in the picture that connects to the top of the 3" down pipe. Since that will be less than 5' away from my shower trap I thought it would be good for code. I'm getting the fittings today so I'll do a dry run and take some photos and post them up here.

    Thanks again for your advice!

    Cheers
    S

  6. #6
    DIY Senior Member asktom's Avatar
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    The trap arm needs to be vented before it drops downward.

  7. #7
    Moderator & Master Plumber hj's Avatar
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    I hope the second shower is not connecting to the "bottom" of the trap which is possible since we do not know which direction the drain is flowing.
    Licensed residential and commercial plumber

  8. #8
    DIY Junior Member AnimalHungry's Avatar
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    So this photo better shows what I'm planning on doing now. Ignore the 1.5" pipe (it'll be a 2" pipe), and I'm missing a 2" to 3" bushing and the proper 2" trap, but the principles are all there. I've annotated one plan view photo with the fittings resting next to where I intend to fit them. The other photo is just to show a side elevation of the new fittings.

    Does this look good? Any suggestions greatly appreciated!

    Thanks
    SimonName:  Proposed DWV for shower 2.jpg
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Size:  46.5 KBName:  Proposed DWV for shower 3.jpg
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  9. #9
    DIY Junior Member AnimalHungry's Avatar
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    Quote Originally Posted by hj View Post
    I hope the second shower is not connecting to the "bottom" of the trap which is possible since we do not know which direction the drain is flowing.
    There will only be one shower drain, although there will be two shower valves/heads - hence the 2" waste pipe to cope with the flow from two showers into the one drain.

    Cheers
    Simon

  10. #10
    DIY Senior Member bluebinky's Avatar
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    The vent needs to rise vertically (within 45 degrees of vertical) until 6" above the flood rim or 42"? above the floor. It can't lay flat.

  11. #11
    DIY Senior Member Hammerlane's Avatar
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    Quote Originally Posted by AnimalHungry View Post
    I thought long and hard about this last night and have decided to cut out the 3" wye and replace it with a new one pointing towards the new shower drain
    I don't see a 3" wye anywhere..
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    Last edited by Hammerlane; 09-17-2013 at 03:50 AM.

  12. #12
    DIY Junior Member AnimalHungry's Avatar
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    Thanks for all your help. I've sorted it out now.

    Cheers
    Simon

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