S Trap / vanity sink drain / vent

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by DOPeter, Apr 16, 2007.

  1. DOPeter

    DOPeter New Member

    Messages:
    7
    Hi. Yet another newbie question...

    I am 90% done with a complete master bath renovation and was just going to hook the drain up the way it was which is with S traps. I've read to avoid the S Trap because of the possibility of siphoning and sewer gas entry.

    Is is critical to convert to P-traps going through the wall? What about installing an automatic vent device in the vanity itself?

    I read in a book that this is easy to do. The vanity is in place and it would be a bit of a hassle to remove (cutting out valves, etc.) See pic.

    Any suggestions?

    -Pete

    Attached Files:

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,990
    Location:
    New England
    Well, it appears you have another problem...unless the drawers are quite short, you won't be able to close them with the water supply line where it is. Is there a vent? Doesnt' look like it. An inspector would likely fail this install.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,607
    Location:
    Cave Creek, Arizona
    trap

    You should have asked the question when you were 10% started, not 90%. Even then it might have been difficult to properly vent the sink.
  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,347
    Location:
    Yakima WA
    Most of the pro plumber really dislike the AAV, but in reality, unless/until they malfunction sometime, they will do the job. They must have easy access for replacement. You are going to have a drawer problem. You could shorten them so there would be space behind them. What you should have is the drain in the wall, but you'd still have some problems with the top drawer. I would have used a vanity that had doors in the center, then it wouldn't matter where the drain is located.
  5. DOPeter

    DOPeter New Member

    Messages:
    7
    The water supply lines are fine, as the drawers don't go all the way to the back. And yes, i should have researched the drain work earlier. I did have a licensed plumber do the rough-in plumbing for my shower. i should have asked him about the drains. I just figured that i would hook them back up the way they were...never thought a 20 year old house would have code issues:mad:

    shoulda woulda coulda... I may try the aav. If they work, fine. Otherwise, i'll bite the bullet, remove the vanity and call in a pro.

    Thanks,

    Pete
Similar Threads: Trap vanity
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & New Vanity w/ Funky P Trap "bottle trap" May 27, 2013
Plumbing Forum, Professional & DIY Advice, Tips & Vanity P-Trap weird configure May 12, 2013
Plumbing Forum, Professional & DIY Advice, Tips & Bathroom vanity p trap Apr 11, 2012
Plumbing Forum, Professional & DIY Advice, Tips & p-trap location Changing from wall hung sink to vanity sink Oct 21, 2011
Plumbing Forum, Professional & DIY Advice, Tips & Replacing old p trap - new vanity Apr 23, 2011

Share This Page