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Thread: adding bathroom, will vent pipes be large enough?

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  1. #1
    DIY Junior Member kauaicuda's Avatar
    Join Date
    Jan 2013
    Frederick MD

    Default adding bathroom, will vent pipes be large enough?

    I am adding a basement bath. My home has a pre-installed vent for a basment bath runs up to the 2nd floor and ties in at the proper place.

    I am concerned about the number of tie-ins at one location for the various vents and Im having a hard time figuring out how to calculate it per the charts and values in the code book.

    The pre-plumbed vent ties into a 2" vent line that currently vents:

    2- 2nd floor bathroom sinks
    1- 1st floor toilet
    1 - 1st floor bathroom sink
    1- kitchen sink
    1- basment wash sink/ washing machine drain

    This vent, line, in turn, ties into the 3" vent stck that goes through the roof that also vents:

    1- 2nd floor toilet
    1- 2nd floor shower

    Will adding may basement bath with a sink, toilet, and shower be too much?

    Thanks in advance,
    Last edited by kauaicuda; 01-10-2013 at 01:01 PM.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Bothell, Washington
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    You can vent three complete bathroom sets with a 2" pipe, assuming that there are also other vents in the home; which yours does.

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