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Thread: new second floor bathroom

  1. #1

    Default new second floor bathroom

    Hello,

    I am planning the DMV system for a new second floor bathroom. The bathroom is directly above a first floor bathroom (the house is a 50's Cape).

    There is an existing 3" drain/vent stack to which I will be draining the vanity and toilet into (they are on the same wall as each other and the main stack).

    The tub is on the other side of the bathroom. Currently, the vent pipes from the first floor bathtub and kitchen sink run just above the second floor. I will be reventing these.

    My question is:

    Can I drain the tub into the existing vent from the kitchen sink below instead of draining it into the main drain/vent stack?

    Thank you for your reply.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    Can I drain the tub into the existing vent from the kitchen sink below instead of draining it into the main drain/vent stack?
    Not unless you want to create backups for your kitchen sink.

    Any water coming down the pipe, will either pull the trap seal from the kitchen sink p-trap, creating bad smells,
    Or overfill the sink.

    Vents pipes are not normally even run with waste fittings, knowing that only air move through them.

    The tub could be tied in below the kitchen sink drain, if you run a new waste line and tie it in below the kitchen sink.
    Last edited by Terry; 06-14-2009 at 02:11 PM.

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default vents

    You CANNOT drain ANYTHING on the second floor, such as the toilet, tub, shower, or sinks, into the first floor vents. EVERYTHING either has to have its own drain line, or the lower level vents have to revised so the upstairs can use the existing pipes for drains. Neither situation is normally very easy to accomplish.

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