question to recitfy a stupid mistake!

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by backwaterdogs, Dec 4, 2011.

  1. backwaterdogs

    backwaterdogs New Member

    Messages:
    51
    Location:
    Illinois
    Was almost too afraid to post this question, but since it's fairly anonymous, here it goes.

    Was rouging in a showerfloor drain, at same time finishing the area below. I ran behind on the drain and the drywallers below needed to move on, so I went ahead and got the ptrap and drain line in and everything..that's all fine i think. After I did that I just stubbed in the drain pipe from what will soon be the floor drain in the shower to the afore mentioned p-trap. However, I wasn't sure of the final height I needed as I will be putting in a mortar flow, so just left this several inches above the floor.

    What I thought I had done was just primered the p-trap and dry-fitted the drain pipe in. Well, got distracted for while and now getting back to the drain and for the life of me I can get what I thought I only dry-fitted to that p-trap.

    Trying to avoid cutting an access panel in the dry wall, but want to be sure that drain pipe is glued in. I got it budge a little but am afraid to use too much force and break the p-trap (done that before)

    Any ideas on how to unstick what I'm pretty sure are just two pieces of dry-fitted pvc?
  2. backwaterdogs

    backwaterdogs New Member

    Messages:
    51
    Location:
    Illinois
    never mind, i got the darn thing out. Dang, embarrassed myself for nothing!
  3. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,897
    Location:
    NW Ontario, Canada
    The primer is meant to go on just minutes before glue-up, not hours, days, weeks before. It softens up the PVC to improve the bond and so should be dry-fitted before priming, not after.
  4. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,328
    Location:
    Yakima WA
    Actually dry fitting PVC is a mistake with or without primer. Both PVC and ABS, although different chemically, are what is called, "interference" fit. Basically this means the fittings are tapered very slightly, and pipes will not bottom out when dry fit. When their respective solvents are applied, the surface of the pipe and fitting becomes liquified which allows the pipe to bottom out in the fitting. Besides the difficulty of separating the dry fit joints, when the pipe is cut according to the dry fitting, then assembled with solvent, you will lose up to 1/4" per joint.
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,897
    Location:
    NW Ontario, Canada
    I use a measure tape to determine length and glue up as I go, not any dry fit method of trial and error. The dry fit is only to set witness marks for rolling a fitting to the proper angle and to assure I hit where I need to.
  6. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,328
    Location:
    Yakima WA
    Agree with LLigetfa! Fit, cut, "glue" as you go is the only way you can be really accurate.
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