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Thread: plumbing slope in sink

  1. #1
    DIY Junior Member brs7377's Avatar
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    Default plumbing slope in sink

    Gentlemen,

    I replaced our vanity with one that has the sink on the right side, rather than the middle of the vanity as the old one did. I decided to just cut the pvc drain off close to the wall and run in with a 90 to the right and then with a 90 back towards the p trap and sink. Unfortunately the water supply valve was in the way (adjacent to original drain to the right) so I had to slope the 90 that I connected to the old drain slightly down (Probably 15 -20 degree angle). When I thought about what I had done, I got a little worried. It appears I basically made one huge p-trap. I used 2 inch pvc material with solvent connections everywhere (except from p-trap to 1.25Ē sink drain). Is this the kind of thing that will get me hammered by a home inspector when I go to sell our place? Everything is draining fine with no leaks.

    P.s. Iíll post a pic when I get back home if my description sounds too confusing.

    Thanks,


    Ben Stone

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Everything needs to flow downhill from the outlet of the p-trap. Plus, you are only allowed 135-degrees (I think) before it hits the drain on the trap arm. While it will take more room underneath, I think you should have run it diagonally with a 45. The plumbing inspector would probably flag this and make you redo it. The back slope will not allow hair and other crud to wash down the drain, and you'll be cleaning out a full trap periodically as well.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member brs7377's Avatar
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    Default point

    Thanks for the response. It makes a lot of sense what you said. I attached a photo just to show what I was talking about a little better. It looks like I need to mentally prepare myself for a redo following the home inspector's comments at sale time. I guess perhaps it is somewhat of a saving grace that I used the bigger 1.5 inch drain for the p trap and trap arm, but I'll keep an eye on the cruddy build up.
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  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    You can cut the tailpiece to any length you wish, as long as it fits into the compression nut a ways. That whole thing will give you grief, sooner rather than later. You should cut the tailpiece off so you have about the 1/4" per foot slope (down) to the fitting in the wall. A little more won't hurt, but you don't want too much until the vent.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    DIY Junior Member brs7377's Avatar
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    Default is this more like it

    I took your advice, cut it out, and got (what I hope is) a proper slope. Can I get a smiley face?

    thanks for the help,

    Ben
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  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default

    From here, it doesn't look like it has the proper slope, but then it could be the angle the picture was taken at.

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