Un-stick PVC Joint that got a little primer in it? (Kerdi Drain)

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by hiperco, Feb 25, 2012.

  1. hiperco

    hiperco Member

    Messages:
    63
    Location:
    Upstate NY
    I'm working on a Schluter Kerdi shower, and installed the riser for the kerdi drain yesterday. In order to ensure the riser was plumb, I had the kerdi drain dry fit to the top of it, with the intent to pull off the drain once the riser was set. This morning I find that I CANNOT pull the kerdi drain off the riser :mad: . I have to assume I got some primer in the joint. Any suggestions on how I might be able to separate the drain at this point, without ruining it?
  2. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    How did you get primer into the joint if you dry fit it?
  3. hiperco

    hiperco Member

    Messages:
    63
    Location:
    Upstate NY
    Whew, I got it off.

    Obviously I was too liberal with the primer, and some ran down while I was handling the assembly:

    Attached Files:

  4. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    Yeah I was curious because the drain would be on top and the trap on the bottom. Primer doesn't run up.....it runs down. Use a rag to wipe up excess primer and solvent.
  5. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,395
    Location:
    Yakima WA
    Your biggest mistake was dry fitting. PVC has what is called and interference fit which means when you dry fit it together, it wedges in and is very difficult to remove. The solvent liquifies the surfaces of the pipe and fitting so the pipe will slide into the fitting and bottom out. Primer and PVC cement do not stick the pipe and fitting, the joint is chemically welded.
  6. hiperco

    hiperco Member

    Messages:
    63
    Location:
    Upstate NY
    Although what you said is typically true, the kerdi drain will allow a full dry fit without issue. It still comes apart unless you are sloppy with the primer like I was ;)
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,313
    Location:
    New England
    I was surprised at that, but noticed that the Kerdi drains I've played with have what seems like very little taper to their socket, and you can bottom it out on a riser and still get it off without contortions as long as it is dry. The primer has some solvent in it, but not as much as the cement, so getting any of it on a joint will make things sticky.

    FWIW, the primer and cement will easily eat a hole in their foam tray or curb material...I can tell you that from experience! Not generally a problem as a bit of thinset will fill it in, but don't spill a lot!
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