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Thread: how deep can a p-trap go into bsmt floor

  1. #1

    Default how deep can a p-trap go into bsmt floor

    shower is 2" drain and i want to vent with 2" as well, the sewer line is 11" deep in the cement floor, can i lower my trap below the sewer line then come up to the vent and slope down to the sewer from there, this is so i can fit everything under the new floor

    thanks for your help

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
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    From the outlet of the p-trap, you can only go down. That means that the bottom of the p-trap will be below the drain line.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default will vent work properly

    what i want to do is go a foot to sixteen inches straight down from shower drain, hook on semi-circular curved part of trap, then travel straight up and connect to elbow outlet of trap at a height that would allow me to connect the vent so it will be under the floor at a decent height above the sewer drain line ( which is 11" under cement), from the vent i have to travel about 10' to the sewer drain
    i could put the trap even deeper if allowable, just want to confirm that vent will still work if i do so

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    You don't want to do that...the trap being that deep first means you'll have a change for accumulation of crud in the pipe that you'll smell and have to clean and, a trap that deep just won't work properly. You can run your vent up from the drain line within the allowances if you set the trap to what you have now.
    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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