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    dnm3skip's Avatar
    dnm3skip Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 15, 2010, 04:50 PM
    How many inches above the lavatory top must a vent go before making a horizontal run
    Making a bathroom in an old bedroom. Want to tie lavatory vent into an existing vent that exits the through attic but need to make a horizontal run to get there. How far above the sink must I be before I gor horizontal for several feet?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Jul 15, 2010, 04:59 PM

    You can go horizontal starting 6" above the fixtures flood rim. You will give the vent slope back to the lavatory and connect to the vent using a inverted Sanitary Tee.
    Good luck, Tom
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #3

    Jul 15, 2010, 05:01 PM

    Hi Dnm3skip...

    The vent must be, at a minimum, six inches above the flood level rim of the highest fixture on the floor. 42-48" off the finish floor is most common. Be sure to pitch your vents back toward the drain pipe when going horizontal!

    Good luck...

    Mark.

    PS: Please post any replies to the box at the very bottom of this page. Thanks.
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