PVC P-traps with threaded union bad idea?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mc-lemons, Apr 18, 2020.

  1. mc-lemons

    mc-lemons New Member

    Apr 18, 2020
    Hi everyone!

    First-time poster here, but I wanted to say that I greatly appreciate the community and all the knowledgeable folks on this site.

    Anyways, so my buddy and I are in the process of gut-rehabbing a duplex into a tri-plex. Note that we are not tradesmen, so we are learning as we go!

    We completed the DWV rough-in, and just water tested the system today. We found that a number of the 2" p-traps were leaking. I believe we have a total of 12 throughout the place (3 washer standpipes, 3 shower drains, and 3 floor drains).

    We installed the traps in the link below, which have a threaded union. That joint is where all the leaks were found.

    It's important to note that we did not go around and ensure all the p-trap joints were tightened prior to testing. Maybe that's all we need to do? I believe that particular type of connection should not be taped/doped, correct? Do you think using the screw-type p-traps was a bad idea (vs. a fully glued p-trap) since all of them will ultimately be buried in walls or ceilings? Or should we be fine if we tighten everything up?

    Looking forward to your feedback!

    Last edited: Apr 21, 2020
  2. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    If the trap will remain accessible (not the ones you are talking about), I would opt for unglued traps. They are really nice when you need to make changes. If you put a trap adapter at the wall for the kitchens and lavatories you rehab in the future, you will make things better for the buyer, and maybe easier for you.

    I don't know if the traps you installed are approved for inside of walls.
  3. Sponsor

    Sponsor Paid Advertisement

  4. mc-lemons

    mc-lemons New Member

    Apr 18, 2020
    Do you know where I can find out more about this? Is there a proper term to use for these kinds of p-traps? All 12 will not be accessible once walls and ceilings are drywalled.
Similar Threads: P-traps threaded
Forum Title Date
Plumbing Forum, Professional & DIY Advice Need To Lower P-traps On Back To Back Bathtubs Jul 11, 2020
Plumbing Forum, Professional & DIY Advice Two P-Traps or just one? Jul 7, 2020
Plumbing Forum, Professional & DIY Advice Plumbing P-traps for double vanity Jun 10, 2020
Plumbing Forum, Professional & DIY Advice height of p-traps and san tee Jan 30, 2013
Plumbing Forum, Professional & DIY Advice Chrome P-traps Apr 6, 2011

Share This Page