slow draining tub, help!

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by beeheck, Sep 6, 2006.

  1. beeheck

    beeheck New Member

    Sep 6, 2006
    I bought a house knowing the plumbing was a problem. I ripped out ALL the waste pipes (drain pipe) and replaced with new, all PVC. Every thing works fine except the drain in the tub/shower. It is a slow drainer so I went back under the house and looked it over and I had put in an "S" trap in line so I cut out all the new pipe I had just put in and while I have all the pipe leaving about 6" on both ends. I put a 5 gal bucket under the drain end and had the wife run the shower without the shower head (more water) full bore and it drains it out as fast as we could put it in. I put a "P" trap back in line figureing it will drain faster and it doesn't. So, to review it is all new plumbing, it is all on a slight angle to the 4" waste line (no flat zones) and not pluged any where as I've checked both ends when I cut out the pipe to replace the "S" with a "P" and they are open. Any ideas? I will admit this to help speed up the process there is no vent in the system any where. Could this be the problem, no vent? Why does every thing else drain OK except the tub which is the last drain in the system by the way.
  2. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Whoops! You committed the big sin when you didn't vent the fixture.
  3. Sponsor

    Sponsor Paid Advertisement

  4. shacko

    shacko Master Plumber-Gas Fitter

    Jan 22, 2006
    Master Plumber-Gas Fitter
    Rosedale, Md

    There has to be a vent in the system, as you get farther from it the tub has less and less chance that it can pull air; you need a vent, sorry.
  5. beeheck

    beeheck New Member

    Sep 6, 2006
    Looks like I get to go under the house and put in a vent. Thanks, I guess I just never realized that a vent would affect how fast or slow a drain would drain. Thanks!
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    EACH fixture needs a vent. A vent keeps the other drain traps in the system from getting sucked dry when another one is draining. A dry drain allows flies, bugs, rats, mice, sewer gasses, etc. to come up through the now dry trap (although some rats don't seem to give a rat's xxx about a little water!). An S-trap won't pass code and has its own problems, you need P-traps for everything except the toilet which has its own trap built-in.
  7. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

    Nov 8, 2005
    Hansville, Washington
    We all agree he needs a vent, but why in this situation should the lack of a vent affect the tub's drain rate? He says he's going directly into the "waste line", whatever that might mean, which is presumably vented via the stack at some point. I think he's got a problem downstream from where he added the P trap. (Full disclosure: I've been wrong before.)
Similar Threads: slow draining
Forum Title Date
Plumbing Forum, Professional & DIY Advice Slow-draining Kitchen Sink But No Clogs Jun 22, 2017
Plumbing Forum, Professional & DIY Advice Moved and replaced sink. Now slow draining Aug 28, 2016
Plumbing Forum, Professional & DIY Advice Bathroom sink started draining slowly Dec 6, 2015
Plumbing Forum, Professional & DIY Advice Slow draining sink (a.k.a - Pulling my hair out in Omaha) Nov 29, 2015
Plumbing Forum, Professional & DIY Advice Urinals - Slow draining Dec 9, 2014

Share This Page