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Thread: Help venting small bathroom in basemment

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  1. #1
    DIY Junior Member rcdba's Avatar
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    Default Help venting small bathroom in basemment

    I am currently adding a bathroom to the basement. It's a small bathroom 4 x 6 feet. Are my vents correct ? Keep in mind my vent for the toilet and shower connections are going to be sanitary-Tee's or Wye's laying on its back.

    I have two options for the shower vent. Do I run it to the back wall and up or should I run it to the left over the soil pipe and up?

    The sink will be a wet vent. When connecting to the 4 inch soil pipe, will I need a sanitary tee or wye to on its back or can i put it on its side?

    Do I need a vent for the toilet ?
    Is it better safe than sorry and vent everything ?


    Any help is greatly appreciated.

    Richard
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  2. #2
    In the Trades Tom Sawyer's Avatar
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    No part of the vent shall be horizontal until 6" above the flood level rim of the highest fixture which is the lav so.......no
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    DIY Junior Member rcdba's Avatar
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    my vent will be horizontal above flood level rim of sink. this is where the toilet and shower will vent to, then vent to 2" vertical vent ?

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    Nuclear Engineer nukeman's Avatar
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    How will you get the vents to the outside wall without going horizontal under the floor? Are there walls next to the shower and toilet that you aren't showing?

    What Tom is saying is that those vents need to be taken off vertically (>45*) and continue up until >6" above the lav (around 42"), which you cannot do in your layout unless there are some additional walls in the room that you are not showing. Once above 42", they can go horizontal and tie together. Usually, the best way to vent a bathroom group is to wet vent through the lav. You could run the lav in 2" and connect it into the shower line (also 2") to vent the shower. This would then continue to the toilet connection to vent the toilet (3" line would be fine here, but 4" is okay too). From the lav (going up), you would have either 1.5" or 2" vent (depending on what is required in your location) and that would continue through the roof (or tied into an existing vent connection in the attic). Some colder locations require you to step up to say 3" or greater when going through the roof to prevent frost from closing up the vent in the winter.

    Without pics or being there, we can only say what will work from a general point of view. The best layout and what will actually work there depends on many factors that we cannot see (existing plumbing, location of joists/blocking, heat runs, etc.).

  5. #5
    Moderator & Master Plumber hj's Avatar
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    what do you mean by ""the sink will be a wet vent"? Your drawing does not indicate that. You appear to show the shower and toilet drains with horizontal vents under the floor, which is not permitted. What is the yellow line?
    Licensed residential and commercial plumber

  6. #6
    DIY Junior Member rcdba's Avatar
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    was planning to go horizontal under the floor with a wye on its back then up into the wall with a 90 degree to meet the sink. There will be a wall behind the shower toilet and sink. This is behind the blue outline of the room. Below is what I planned to put behind the lavatory and toilet, then this goes up to the vent.

    So I can get rid of the vent (#1) going to the toilet then go up with the yellow vent to the roof? Name:  ventinwallB.jpg
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    thanks
    Richard
    Last edited by rcdba; 01-08-2013 at 06:39 AM.

  7. #7
    Nuclear Engineer nukeman's Avatar
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    You can't do that. You can't run dry vents under the floor (or have them horizontal any place lower than usually 42"). However, a wet vent can be horizontal since it is washed by a fixture. This is why bathroom groups are typically wet vented as it can be difficult to otherwise vent showers and toilets without putting additional walls in the room.

    The other way to do it (using dry vents) is to run the fixtures to the closest wall and take your vents vertically there. However, there are limitations on how far you can go before venting, so this option is not always practical. Wet venting is usually much easier and will usually use fewer fittings and less pipe to get the job done.

    You should search a bit more and see some layouts of what others have done and see if you can get the idea of wet venting. Many think that sticking a vent in the side of the main line will vent it, but that is not the case. Each trap needs to be vented and a dry vent can't be horizontal until above 42" (usually) (no running it under the floor).

  8. #8
    Test, Don't Guess! cacher_chick's Avatar
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    I would run the water closet drain directly towards the main line, and vent it through the lav. The shower drain can bend toward any of the 3 walls to be vented before it meets it's own wye connection to the main line.

    If you place too many bends in any drain line, you will be required to add accessible clean-outs.

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