Double sink rough in. . .

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by TL, May 11, 2013.

  1. TL

    TL Member

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    Hello.

    Does anyone see any drain or venting issues with this rough in for a double sink? (All 1.5 inch pvc). The vertical vent tees into the shower vent in the attic and exits through the existing roof vent. I will be putting a 2x3 wall there, btw. Thanks!

    Tom
     

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  2. Terry

    Terry Administrator Staff Member

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    You should have a 2x1.5x1.5x1.5 fixture cross there, not a 1.5" sancross.

    Snaking that will be hard. They tend to skip over into the other arm.

    The two 90 els above the cross should have been at 42", or if not that, at least two 45's which is considered a vertical installation.
    When I have 1.5 coming from below, I do something like this.

    [​IMG]

    When I have 1-1/2" pipe, I do something like this.

    [​IMG]

    And this if I have 2" on the lower side.
     
    Last edited: May 11, 2013
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  4. TL

    TL Member

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    Ahhhh. . .thanks, Terry. That makes sense, but I have one problem . . .

    If I were to run it as you have pictured, I have a problem at the ceiling. As you can see from the attached pic, the vertical pipe "to the drain" lands on the plate above. To the left of the plate in the ceiling joists is a 2x8 on a flat, so I'd rather not drill through that. Above the small nail to the right in the pic is electrical wiring. So, I have to enter the attic through that hole you see there. Is is acceptable to come off with a 45 wye to get there? Please see my crude edit to your pic! :p Thanks again and I eagerly await your reply.

    Tom MasterBath 042copy.jpg single_to_double_lav edit.JPG
     
    Last edited: May 11, 2013
  5. hj

    hj Moderator & Master Plumber Staff Member

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    There are probably DOZENS of ways the two lines can be connected together. Terry's version is not "chiseled in stone".
     
  6. TL

    TL Member

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    Hi HJ.

    I'm open to suggestions! I want to get this thing done!

    Tom
     
  7. TL

    TL Member

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    This should do the trick, no? :)
    MasteBath 043copy.jpg
     
  8. cwhyu2

    cwhyu2 Consultant

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    Yes, that will do the trick.
     
  9. hj

    hj Moderator & Master Plumber Staff Member

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    Overkill, but it will work.
     
  10. TL

    TL Member

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    Well it only took 15 minutes, so it was easy enough. Thanks, all, for the replies! Much appreciated. :)
     
  11. Terry

    Terry Administrator Staff Member

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    That looks pretty dope!
    An expression that my son Jamie uses.
     
  12. darren_t_johnson

    darren_t_johnson New Member

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    hj, why do you say its overkill? Because both vents run all the way to the ceiling instead of 42" (or 6" above the fixtures)? I'm probably mixing multiple plumbing standards...

    I'm just curious to hear other peoples opinions.
     
  13. SewerRatz

    SewerRatz Illinois Licensed Plumber

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    I would of added a clean out above each tee.
     
  14. TL

    TL Member

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    Thanks, Terry.

    Off to the next question. . .:)
     
  15. cwhyu2

    cwhyu2 Consultant

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    And accsess how?
     
  16. TL

    TL Member

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    That would be my question also.

    And I'm guessing overkill in the sense that I could save 2 feet or so of pipe by tying in that left drain vent connection at 42" or so instead of at the top. I could still do that as they are just dry fitted at this point.

    Tom
     
    Last edited: May 12, 2013
  17. SewerRatz

    SewerRatz Illinois Licensed Plumber

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    From under the sink, how else would one access it?
     
  18. TL

    TL Member

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    So, I would have to notch out the drywall and notch out the back of the vanity in order to access it? Why wouldn't one just put the snake in the drain or the p trap instead?
     
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  19. TL

    TL Member

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    New question(s) that I thought should go here...

    I finally got around to putting in the new sinks. In this setup above (1 1/2 inch wall drain), does it matter if the p traps are 1 1/4 inch or 1 1/2 inch?

    I have two 1 1/2 inch PVC p trap kits, but the new faucets came with the 1 1/4 inch tailpieces. Do the 1 1/4 inch have a tendency to clog more often? They seem so small. Would it be better to use some kind of "reducer/expander" and use the 1 1/2 inch traps instead? What's my best bet here?

    Thanks.
     
  20. TL

    TL Member

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    I think I found the answer to my question.

    If I use the 1 1/4 tailpieces, I MUST use 1 1/4 inch p traps. Is that correct? Or am I confused?
     
    Last edited: Nov 26, 2016
  21. TL

    TL Member

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    I was confused.. :).

    I found the reducing washers.

    I just need to change the trap adapters at the wall.
     
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