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Thread: Basement bathroom DWV review/thoughts

  1. #1
    DIY Junior Member cheqmate5000's Avatar
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    Default Basement bathroom DWV review/thoughts

    Let me start out by thanking everyone for the wealth of knowledge you provide on this site. I have been reading on this site on and off for a couple of years and have gained a lot of plumbing knowledge that I would have otherwise not had.

    I am currently designing a bathroom that I would like to put in my basement. I am located in Wisconsin and plan to pull a permit as soon as I have solidified the dwv plans. The following picture is looking toward the bathroom where there will eventually be a door. The green line shows the current 3" waste line. I have punched a hole in the concrete and confirmed the location of the waste line. It is located approximately 1.5 feet under the concrete so I have plenty of height to play with to get 1/4" drop per foot for all waste lines. I didn't model the 1/4" drop per foot but will be sure to include it when actually doing the plumbing. The thin purple line represents 3" pipe, the rest will be 2". The blue pipes are vents which will all tie together in the ceiling and connect to an exisiting 3" vent that runs directly to the roof. I will make sure to slope the vents back toward their respective waste lines in case of condensation, etc. The only san tee in the design is for the lavatory. I will make sure to use long 90's etc and combo Y - 1/8 bend for waste fittings. Sorry as I am not the best using Sketchup, I just wanted to make sure I put together a solid plan.

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    Front left - corner shower
    Back left - corner tub
    Front right - cabinet/lavatory
    Back right - corner toilet/water closet

    Here is a closer picture looking at the plumbing for the toilet and the lavatory. I am attempting to wet vent the toilt and the lavatory but am not really sure that I have done this correctly.

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    Distances

    tub trap to vent - 3.5'
    shower trap to vent - 12"
    toilet flange top to san tee vent - 5.5' (I may be able to shorten this up some by moving the vent/waste line closer to the toilet but still inside the cabinet. I am not sure the exact length that this can be.)

    I would really appreciate some feedback on this layout. If you need any additional pictures or information please let me know and I can provide them. Feel free to comment on simpler/better ways of doing this as I am a novice.

    Thanks.
    Lon
    Last edited by cheqmate5000; 04-15-2013 at 10:59 AM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    It looks perfect.

    The toilet vent can be 2", which means that a 2x1.5" santee will be fine there for the lav.

    http://www.terrylove.com/forums/show...bing-inspector
    Last edited by Terry; 04-15-2013 at 12:27 PM.

  3. #3
    DIY Member jadziedzic's Avatar
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    Dimensions of the entire area would be helpful, but given that a 1/4 inch drop per foot slope gives you AT MOST 6 feet before your new 3-inch pipe from the existing line will impact the bottom of the concrete slab, and you still have another 5-1/2 feet between the toilet flange and the vanity, I can't see how you can maintain a 1/4 inch per foot slope from the toilet to the existing line.

  4. #4
    DIY Junior Member cheqmate5000's Avatar
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    Wow, that was very fast feeback, thanks!

    Terry - Am I correct in that the pipe should stay 3" all the way up to the lavatory santee, then go to a 2"x1.5" santee? I seems to make sense in my head because then there is internal surface area for water to drain from the lavatory as well as pull air from the vent.

    jadziedzic - the room is about 10'x10'. Sorry, I just noticed the mistake in my original post. The waste pipe that is currently there is 1.5 feet down, not 1.5 inches. Thanks for catching that. I would have definately had problems if it was that close to the concrete floor.

  5. #5
    In the Trades Tom Sawyer's Avatar
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    nothing vertical there needs to be any bigger than 1-1/2", in fact, if the distances are correct the entire group can be wet vented with a single 1-1/2" pipe
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  6. #6
    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by cheqmate5000 View Post
    Wow, that was very fast feeback, thanks!

    Terry - Am I correct in that the pipe should stay 3" all the way up to the lavatory santee, then go to a 2"x1.5" santee? I seems to make sense in my head because then there is internal surface area for water to drain from the lavatory as well as pull air from the vent.
    The vertical section of the wet vent should be 2". The dry vent can be 1.5".

  7. #7
    DIY Junior Member cheqmate5000's Avatar
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    Tom Sawyer - I may be mistaken but I thought I saw in the code book a while back that pipe going into concrete had to be a minimum of 2". That is why I chose 2" instead of the necessary 1-1/2" vent for the tub and shower. I will have to find what I read. Thoughts?

    Thanks cacher_chick, that makes sense.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Good practice and many codes require a 2" vent for a toilet connection.
    Licensed residential and commercial plumber

  9. #9
    DIY Junior Member MikeON's Avatar
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    Can shower and the tub share a vent ? As a common vent . Place it anywhere between p-traps.

  10. #10
    Test, Don't Guess! cacher_chick's Avatar
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    Quote Originally Posted by MikeON View Post
    Can shower and the tub share a vent ? As a common vent . Place it anywhere between p-traps.
    .

    The only approved wet vent for a bath group in WI is through the lavatory.

  11. #11
    DIY Junior Member Jon Hayden's Avatar
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    Hi,

    I know this is an old thread, but I just stumbled across it and the plan is surprisingly similar to what I'm going to do for my basement bathroom. One thing I don't see in the plan is a clean-out. Are clean-outs not needed? Also, in my case the nearest venting is on the complete opposite side of the basement from my rough-in. The builder said I can use an AAV instead of an atmospheric vent. So my plan is to put an AAV in the vanity. Here's an image of my rough plan. The left image is the existing rough-in and the right image is how I'm going to change it.


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  12. #12
    DIY Junior Member Jon Hayden's Avatar
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    Does my plan look okay?

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