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    sparkyshock1's Avatar
    sparkyshock1 Posts: 7, Reputation: 1
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    #1

    Feb 25, 2008, 03:14 PM
    Minimum vent size
    I am installing a full master bath away and inaccessible to the vent stack. I am using a 3" drain(PVC) for toilet, sink and shower. What is the minimum size vent stack I should use?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
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    #2

    Feb 25, 2008, 03:43 PM
    Hi sparky...

    The minimum size vent for full bathroom is 2" (as long as there is at least 1-3" vent stack already out the roof of your house).

    If you do not have a vent penetrating your roof yet, then 3" is minimum requirement for a vent.

    Venting fixtures can also be a bit tricky... for example, toilet requires 2" minimum vent... and that vent can usually act as a waste line for the lavatory or the tub... making it a wetted vent... DEPENDING ON CERTAIN CONDITIONS... so let us know if you need help with that.. OK?
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