Is this an S-Trap? Please help!!

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by derbarrett, Mar 12, 2011.

  1. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    Hello All,

    I am brand new to the plumbing world and have a couple of questions that I really need help with!!!
    I am replacing the sink and vanity in my master bathroom, but there seems to be a small issue. The previous configuration had the sink drain into the floor instead of the wall.

    1. All of the pics that I have seen online have the sink drain going into the wall (i this called a P trap?). In addition, all of the vanities that I have seen seem to be designed for the drain to go through the wall as well. Is my current configuration considered an S-Trap? If so, I have been doing some research and it seems like S-Traps do not meet plumbing code. Is this true?

    2. My bathroom "floats" above my living room so there is huge I beam holding it up. This means that there is no room to run the drain pipe behind the wall because I would literally have to drill through the I beam. It seems like my only option to keep the configuration like it is now. Are there any other options?

    3. I have attached a few picks. Pic 1 shows the floor drain. Pic 2 shows the I beam. Pic 3 shows the floating bathroom.

    Thanks for your help!

    Attached Files:

  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Well, you have no trap at all yet, but if you put a trap under the sink and then turned down right away into that drain pipe, then it will be an S.
  3. Cubey

    Cubey New Member

    Messages:
    78
    Location:
    Southern Arkansas
    Perhaps you could do this:

    [nevermind..]
    Last edited: Mar 13, 2011
  4. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    So...... is there anything wrong with the sink draining into to the floor?
  5. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    As much as we dislike the thought of using an air-admittance valve, this would be the place which I would use one.

    To do so, the existing pipe should be coming up out of the floor 17" On top of that install a sani-tee and trap adapter. Off the top of the sani-tee run a straight piece up as high as the vanity will allow and then install the AAV on the top. If you can get the AAV up higher by using a couple of 45's to clear the sink bowl, it would be even better.

    An AAV may or may not be allowed by your plumbing code, but it will work.
    Last edited: Mar 12, 2011
  6. Cubey

    Cubey New Member

    Messages:
    78
    Location:
    Southern Arkansas
    I'm wondering if it's tied into another drain like the kitchen sink. Does the kitchen sink have the same drain setup or does it have a p-trap? If the house is pier and beam or has a basement, I wonder if maybe there's a single p-trap someplace under the house or in the basement with the kitchen and bathroom tied together since the bathroom sounds like it's almost over the kitchen. When you run water in the kitchen sink, can you hear gurgling or noise in the sink's drain pipe? You might try that. Or even try pouring water down the sink drain pipe and have someone in the kitchen to see if it sounds like it's passing by near the kitchen sink's drain. Either way you might be able to hear water gurgling if they are connected together.
  7. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    Please excuse me if I sound ignorant, but I am a newbie.

    1. In the big scheme of things... why is it better for the sink to drain through the wall with a p-trap as opposed to it going directly into the floor? Doesn't the wall pipe eventually turn down to the floor anyway?

    2. I would like to install a floating vanity. Is this even a option for me with my plumbing configuration?


    http://www.tonusa.com/Pic/Pic/products/tseries/t1000/t1000c.jpg
  8. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,244
    Location:
    Land of Cheese
    The problem is you must have a trap, and that trap must have a vent. Without either, the sewer gas can come back up the drain and stink up the house.

    Having the pipe in the wall allows a place for the vent pipe to run hidden up through the roof.

    A floating vanity won't be too pretty with a big ugly drain coming up through the floor.
  9. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    I believe that the sink drain is connected to the toilet and shower drain, and that drain is connected to a vent pipe.

    I have attached a pic of what I think is a vent pipe in the bathroom
    [​IMG]
  10. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    Hers the pic
    [​IMG]
  11. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
  12. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    So instead of an s trap you suggest an s trap and two more 90s? Are you serious?
  13. Cubey

    Cubey New Member

    Messages:
    78
    Location:
    Southern Arkansas
  14. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    More trap arm is better, but you're still not venting the drain properly unless you install a santee and at the very least an AAV as high up inside the vanity as possible.

    Personally, I would be opening up the wall, especially if you want to end up with a nice looking floating vanity.
  15. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    You would be venting the drain properly if the piping was in the wall.

    [​IMG]
  16. derbarrett

    derbarrett New Member

    Messages:
    8
    Location:
    Atlanta, GA
    So.... do you suggest that I drill through the I beam (see second pic)? I think the I beam is the reason why the bulider did not plumb through the wall in the first place. Also I think that the sink, toilet, shower, and bath are plumbed together and they are all connected to a vent (see link above).
  17. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Every drain requires a vent... having one vent for all of them is called a wet vent and is likely not done legally in your situation.

    I would fur the wall out or arrange the layout such that I could vent the lav properly, rather than go through the floor with an s-trap...
  18. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,329
    Location:
    Yakima WA
    You still seem to be confused. Here's some basics. Every fixture must be trapped individually. The trap must be on the same floor as the fixture. Each trap must be vented. A P trap maybe better called a J trap, is directly below the fixture being drained. The water goes into the bottom of the trap, and up the other side. That means at that point, the pipe is sticking straight up. Now it elbows to the wall drain, but before reaching the drain, you must have a vent. As pointed out, a Studor or AAV will work although these are not preferred by most plumbers and not approved under some jurisdictions. These vents are cut into the horizontal live between the P trap and wall with a tee, a pipe extending up toward the bottom of the sink, then a threaded adapter to screw the AAV into. If you do not put a vent in this location, you will create an S trap. I realize the beam is causing a problem, but you will just have to work around that.
  19. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,128
    Location:
    Maine
    If this is existing piping and you are putting the sink back in the same place you are not required to update the plumbing so you may as well re-install the s trap
  20. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Terrible advice.

    So because you don't have to do something properly, means you shouldn't bother?
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