Harizontal vent, how far

Discussion in 'Remodel Forum & Blog' started by danO, Apr 13, 2005.

  1. danO

    danO New Member

    Apr 13, 2005
    Horizontal vent, how far

    I am in the middle of a major remodeling project.
    I want to join my vents together in my attic on a horizontal plane.
    Toilet 2", shower/lavatory 1 1/2" and kitchen sink 1 1/2".
    How far can the vents run horizontal?
    I need to run 8' from shower/lav, join the toilet vent and continue another 16' before turning 90 degrees, going through a wall and than up.
    Should I increase the size of the vent when the shower/lav joins the toilet vent to 3" ?
    The kit sink would join the vent right before it exits the attic.
    You probally have figured out I am trying not to put a hole in my new metal roof. There are no codes where I live but I would like to do it right.
    Last edited: Apr 14, 2005
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    If these are the only vents in the whole house, then your "final" pipe should be the same size as the one under the floor where it enters the house, and the size should start increasing as the separate vents are merged together. A "good" metal roof installer would have the engineered fittings to seal the vent through the roof.
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