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Thread: Smell coming from standup Shower

  1. #1
    DIY Junior Member theboneman21's Avatar
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    Default Smell coming from standup Shower

    Folks, I wonder if you can offer some help here

    I get a stale water type of smell coming from the main level shower, a standup model. That is the only place it happens.

    From what I can tell the sink , which has its own P trap, is Td into the drain pipe of the shower BEFORE the shower's P trap.

    Not sure if that has any impact ?

    it's not so much septic as it is stale water ONLY from the standup shower, not the sink or wash machine in the same room

    First pic shows the P trap and another piece of piping connected. As far as i can tell, it is the sink next to the shower

    the second pic is the Td in line shows it going into the floor under where the sink is

    However, just past the shower's p trap there is this piece that is capped. not a clue what that is or if it is having an impact

    Could I maybe add some sort of check valve or something between the p trap and shower drain as I have to wonder if maybe the sink usage pushes the water out of the p trap ?

    or maybe a p trap with a deeper curve as this one is not that deep

    I tried doing the add water thing and it would go away for a while then come back after a while, didn't time it or anything. Wonder if maybe a venting issu possibly ?

    For now i have a test plug in there blocking the drain; there are two of us and a baby and we only ever use the main level shower anyway

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  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Are you saying your sink and shower use the same p-trap? If so, that does not meet code since EACH fixture requires its own trap. THen, it appears that NEITHER of those are vented properly.

    The excessively long run for the sink has a LOT of surface area that could accumulate crud, and it's surprising that you don't get some nasty smells from the sink.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    Take the sink drain and wye it into the line after the vent.
    The current vent for the shower has been capped. Remove the cap and continue through the roof, or at least install an AAV there, something like a Studor Vent.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    THere's another possibility, but the first thing is to fix the drains!

    What type of shower pan do you have? If it's tiled, and it's not done properly, there can be standing water underneath the tile, and after awhile, that can smell pretty nasty.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    DIY Junior Member theboneman21's Avatar
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    the sink does have its own P trap underneath it, it's just that it drains to a tie in point prior to the shower's p trap

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    Moderator & Master Plumber hj's Avatar
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    IF the sink has its own trap, it may also have its own vent tied to the rest of the plumbing system. If that is the case, the sewer gases can flow through that section INTO the shower drain and then into your house.
    Licensed residential and commercial plumber

  7. #7
    DIY Junior Member theboneman21's Avatar
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    Hmm

    i wonder if I do some crawling and snap some pics if you guys can give me some pointers based on what you see ?

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    It is never okay to run a drain through two p-traps. ANd, if the sink doesn't have its own vent, it's essentially an S-trap, which does not meet code and can cause problem.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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