(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 15 of 15

Thread: Bigger and longer P-trap

  1. #1

    Default Bigger and longer P-trap

    I was wondering if I could install a larger and deeper/longer P-trap under a shower/tub unit for reasons of after a few years this unit will not be used as much and I would be concerned with it drying out. If this is possible then are there more draining problems with this kind of set up ?
    Should I use standard P-trap now and then deal with problem when and if it happens ?
    Im also asking because this unit will be sitting on concrete pad and be hard to replace.

  2. #2
    Plumbing Designer FloridaOrange's Avatar
    Join Date
    Dec 2005
    Location
    SW Florida
    Posts
    1,317

    Default

    Out of my code book (Florida)
    2007 FPC 1002.4 Trap Seals. Each fixture trap shall have a liquid seal of not less than 2 inches (51 mm) and not more than 4 inches (102 mm)
    You could run a trap primer for a permenant solution.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  3. #3
    Plumber Cass's Avatar
    Join Date
    Nov 2005
    Location
    Ohio
    Posts
    5,984

    Default

    Personaly I would just run all the fistures for 10 Min. a month and forget an oversized trap, and be done with it...they do need to be used reguardless...

  4. #4

    Default

    Sounds great. Thanks for the help.
    Another question is would you install the P-trap in the concrete and stub up or would you rather raise the shower/tub unit off the floor for enough room under to replace p-trap ?

  5. #5
    Plumbing Designer FloridaOrange's Avatar
    Join Date
    Dec 2005
    Location
    SW Florida
    Posts
    1,317

    Default

    I would install in concrete, there are trap "boxes" to form an access area for the tubs if you are worried about it.
    Raising a tub enough to create access above the slab could lead to other problems.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  6. #6
    Plumber Cass's Avatar
    Join Date
    Nov 2005
    Location
    Ohio
    Posts
    5,984

    Default

    I would box out for the trap and not have it encased in concrete then install the shower base according to the instructions that come with it...

  7. #7

    Default

    I think I like the "poured in concrete" idea.
    Thanks

  8. #8
    Master Plumber nhmaster's Avatar
    Join Date
    Jul 2008
    Location
    S. Maine
    Posts
    2,039

    Default

    We always box out tub traps. If you ever have problems with the waste/overflow, working on it with the trap encased in concrete sucks. If you are worried about the trap drying out, fill it with vegetable oil.

  9. #9

    Default

    Thanks. Thats not a bad idea either since you and another have suggested it and with further consideration of more research. Since there are only two of these to be done I will most certainly check into and highly consider the box method.
    Thanks again.

  10. #10
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,615

    Default trap

    All a larger trap would do would be to extend the time before it dries out by a couple of weeks. It would not be a permanent solution. You cannot raise the shower high enough to allow replacement of the "P" trap, (and I do not know why that would ever be necessary), unless you put it 2' above the floor so you could crawl under it.

  11. #11
    Master Plumber nhmaster's Avatar
    Join Date
    Jul 2008
    Location
    S. Maine
    Posts
    2,039

    Default

    A Rubber Maid or similar storage box, placed upside down over the stub makes a good box because you can leave it above the cement and trim it flush later.

  12. #12
    Extreme DIY Homeowner Scuba_Dave's Avatar
    Join Date
    Jan 2009
    Location
    South of Boston, MA
    Posts
    885

    Default

    We have an upstairs shower that isn't used
    I either dump some water down the drain (from dehumidifier) every now & then or turn it on for a minute or two
    DIY Handyman (not 4 hire)
    I have enough to do to my own house

  13. #13
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,192
    Blog Entries
    1

    Default

    The reason plumbers box out and install the p-trap later is two reasons.

    1) After the concrete pour, the trap wouldn't be where you plumbed it,

    2) The framers pulled from the other side of the foundation, which was sized wrong to begin with and now the measurement is off

    3) The drain on the shower is lower then the floor and needs a recess.

  14. #14
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,388

    Default

    Having a large step out of a shower is a big safety hazard. Stepping over the curb just makes it worse. I was in an inexpensive ground floor hotel in London once where they built up the base of the shower to put in the required trap, and almost killed myself getting out!
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  15. #15

    Default

    Very good reasons. Now I better understand why its done that way.
    Thanks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •