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Thread: Adding Bathroom to Basement

  1. #1

    Default Adding Bathroom to Basement

    Picture a North Wall and West wall. Currently have existing ruff in for stool on NORTH Wall(appears to be "wet vented" off this wall). Plan on moving existing stool approx. 4' to the right for corner shower drain. Existing stool ties into main stack(main flows South to North) on WEST wall Approx. 10' away (existing stool flows SouthWest to main), unfortunately "Y" is located in exact location where new stool will be located(approx 2'6" from stack). I'm thinking if I cut the "Y" out and move it forward(North)and reconnect existing stool to "Y" with 45 degree fitting it should give me enough room to add another "Y" for new stool. Do I have to Vent new stool since I'm so close to stack? Am I even close to thinking correctly?

  2. #2
    Engineer jdkimes's Avatar
    Join Date
    Sep 2004
    Littleton, CO


    You might want to try this plumbing code site they have the requirements for a lot of situations. Not sure what you mean that the toilet is wet vented because in a sense most toilets are wet vented. Maybe I didn't understand your description. The stack usually is the vent for the toilet. Sounds like your actually moving the toilet closer to the stack so that's even better. There's lots of professionals on this bulletin board that could answer your question better than I could but thought I'd try since you didn't have any responses.

  3. #3
    Plumber Deb's Avatar
    Join Date
    Sep 2004

    Cool Deb

    I am having some trouble envisioning what you are trying to do. I will say, however that every fixture needs to be vented. A pipe that conveys drainage from an upper floor cannot serve as a vent pipe for a lower floor. The toilet will need a vent taken off between the fixture and the main tie in. Code limits the distance between a vent and the p-trap (UPC limit on a toilet is 6'). There are some special rules when a vent is taken off a horizontal drainage line--you must use drainage fittings (a wye and 1/8th bend), the invert must be taken off above the center line of the drainage pipe, and the line should be graded. The shower will need to be vented in a like manner. The shower, however will need a p-trap under it and the trap arm max is 5'. You may be able to use either the toilet vent or the shower vent to wet vent the lav, if your code allows this and the vent is in close enough proxicimity to the the lav location to meet trap arm maximums (42"). The basement vents can tie together once you are 6" above the flood rim level of the highest fixture. This vent will need to go out the roof itself or tie into another vent 6" above the flood rim level. I would recommend installing a test tee (used as a two way clean out) at the base of the stack if you do not have one now (it is code).

    Or you may want to hire a plumber for some layout advise.
    The Pipewench


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