CPVC shower valve pipes bent

Discussion in 'Shower & bathtub Forum & Blog' started by FinsMagic, Jul 28, 2012.

  1. FinsMagic

    FinsMagic New Member

    Messages:
    3
    Location:
    Sunshine State
    I'm in the process of getting a bathroom rebuilt and the company I'm working with installed some new 1/2" CPVC pipes into the new shower valve. The plumber initially hooked up the CPVC pipes just fine, but after a mishap during the rebuild, the rebuilders had to detach and reattach the shower valve. Upon doing so, 2 of the CPVC pipes are now slightly bent. Since I wasn't able to get a picture before they put up the cement board, I drew a picture (yes, MS Paint). The pex piping in the picture is our existing plumbing. Here's what it looks like:

    bent cpvc.jpg

    Should I have the bathroom rebuild company remove the cement board and replace with straight CPVC before the rebuild gets any further along?
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,239
    Location:
    Land of Cheese
    Slight bends in the pipe are a sign of poor workmanship, but are not going to effect how the shower works.
  3. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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    Post(s) deleted by John Whipple
    Last edited: Mar 18, 2014
  4. FinsMagic

    FinsMagic New Member

    Messages:
    3
    Location:
    Sunshine State
    But how flexible is CPVC? You'll have to excuse me, for I'm a first time homeowner and an amateur on these issues. The joints are all glued properly and the bends are not sharp. So these slight bends in the CPVC could be perfectly fine. But when I took a CPVC pipe and tried to bend it, it didn't seem like it should be bending much at all. On the other hand, I can bend a pex pipe all over the place. In fact, the plumber who repiped my house has the pex piping bent all over the place in the attic and it never concerned me much because I knew it was made to flex (the way it limited the crawl space up there even further did bother me though).
    Last edited: Jul 29, 2012
  5. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,832
    Location:
    New England
    CPVC is designed as a rigid copper substitute and thus, is not designed to be bent - there are fittings for that. PEX on the other hand, IS designed to be bent. If the CPVC is anchored and bent, since it expands and contracts a fair amount with changes in temp, my gut feeling says it may become a problem as it moves against the restraints and flexes. The best thing is to verify with the manufacturer, and, you may find a FAQ page on their website that covers that without any further direct contact.
  7. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I feel that a bend on CPVC is placing a strain on a fitting somewhere.
  8. FinsMagic

    FinsMagic New Member

    Messages:
    3
    Location:
    Sunshine State
    I took you guys advice and found some writing on one of the sink pipes sticking out of the wall. Looking the numbers up, the CPVC appears to be the FlowGuard Gold 1/2" CPVC. The technical manual states:

    Do not bend FlowGuard Gold® and ReUze® 1/2” and 3/4” pipe
    in a radius tighter than 18”; 1” pipe should not be bent in a
    radius tighter than 24”.


    I drew out an 18" radius, and if I had to guess I would say the bends are around 18", give or take a few inches. The tiling starts tomorrow and I'm faced with a dilemma: Have them go through the trouble of taking down part of the cement board and having the plumber straighten the pipes, or just let it go. I don't want this to be a problem years down the road, with the tile having to be knocked down to fix it. At the same time I don't want to piss off the builders, for they did tell me via e-mail the bent pipes won't be a problem.
  9. Chad Schloss

    Chad Schloss Member

    Messages:
    328
    Location:
    USA
    " for they did tell me via e-mail the bent pipes won't be a problem. "

    if you are worried about it, get it in writing that they will fix it if it becomes a problem or have them take it down and redo.
    Last edited: Jul 29, 2012
  10. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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  11. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,315
    Location:
    Cave Creek, Arizona
    quote; sleep better at night knowing the work has hit the 200PSI mark for an hour.
    .

    200 psi? The working pressure for almost ALL plumbing items is 150 psi, so at 200 psi it could be a PERFECT installation and still fail.

    Much of the US does not require this inspection either self inspected or city inspected

    Where in Canada does it say that? Is this an attempt to ameliorate some insecurity? EVERY installation that is inspected IS subjected to a pressure test, INCLUDING drain and vent lines.

    As for the original question, the reason most plumbers use CPVC and PEX is because they do NOT have to install it "straight", meaning they can be sloppy and still do an acceptable installation. Who did the 'repair piping'? If it was NOT the plumbing contractor, you lost his guarantee for the job, because someone else has "tampered" with his work.
    Last edited: Jul 30, 2012
  12. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

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    Post(s) deleted by John Whipple
    Last edited: Mar 18, 2014
  13. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
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    Location:
    Cave Creek, Arizona
    quote; With the pressure inflated we have seen countless fittings and fixtures fail

    Exactly. It is a "ridiculous" test designed to "damage" plumbing items which were NEVER meant to operate at more than 150 psi, even though their individual "test pressures" are 300 psi.
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