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Thread: help with venting

  1. #1
    DIY Junior Member jasonmartin1313's Avatar
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    Default help with venting

    Hello
    I am looking for help with venting my basement bathroom. All walls are available for venting although the lower wall in the picture and the far right wall are the preferred walls to run in. Looking for any advice, thanks all.


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  2. #2
    In the Trades Tom Sawyer's Avatar
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    No pink. wet vent the whole bath through the lav. You will need to provide the bar sink with it's own vent though
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    DIY Junior Member jasonmartin1313's Avatar
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    awesome, so the lav would be changed to 2". Next question is the sump, it has 3" threads for the vent pipe, question is, is 2" sufficient for the sump as well? I do not see anything that dictates the vent size. I had read once that it had to be a dedicated run as well or else it could effect ptraps when cycling on/off, is that true?

  4. #4

    Default sump vent

    sump vent must run individually thru roof and min half diameter of waste but 1ft below roof line increase to 3in

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    Moderator & Master Plumber hj's Avatar
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    Separate sump vent is a local issue and requirement, and 2" is usually all that is required, ( I have never seen a domestic ejector basin with an opening for a 3" vent). The underground piping must usually be 2", and the shower has to be revised to provide for its own vent since the toilet waste flow passes across its connection to the main line.
    Licensed residential and commercial plumber

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    DIY Junior Member jasonmartin1313's Avatar
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    Ok so here is the updated plan, 2" drain to lav, wet venting the wc. Added the 2" vent to the shower, the bar sink would be aav vented since it is probably going to be free standing with no access to above. I also included the 2" dedicated vent from the sewage basin, (3" protrusion through the roof). Thanks for the inputs all. As far as buring the pipes under the concrete, gravel or sand ok? also the protrusion through the floor, wrap them in duct tape to allow for movement?

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  7. #7
    Homeowner geniescience's Avatar
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    a straight shot from the WC to the end is better ;
    2ndly: combine the vented lav drain to the bar sink and the shower
    (this puts the WC downstream of the cleaner stuff. I think it makes it a bathroom group.)
    You haven't written anything that makes me think you couldn't do this.
    This might be a raised floor or you might be cutting a slab.
    Nonetheless, I haven't seen any reason not to go straight from the WC to the end.

  8. #8
    DIY Junior Member jasonmartin1313's Avatar
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    This is all in the basement, the reason it is "L" shaped is because that is the shape of the foundation wall. I cant make a straight line from the wc to basin for that reason. I cant vent the bar sink with the lav because the bar will not extend to the ceiling nor will it touch a wall, it is more like an island. Thanks for the input

  9. #9
    Retired Defense Industry Engineer jadnashua's Avatar
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    The bar sink may not drain well with only the AAV on it. You may need to get a bit more complex and use something like a loop vent (see what the pros have to say).
    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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    In the Trades Tom Sawyer's Avatar
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    I hate the damn things but....it will vent just fine with an AAV
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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