Stumped on venting situation

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by whackit, Apr 14, 2014.

  1. whackit

    whackit New Member

    Messages:
    21
    Location:
    Los ANgeles
    Hello all, long time lurker with my first post. I have a situation I have never run into. I can't figure out how to vent.

    Corner bath with 7' windows on either side. There are structural steel posts at the ends of each window that I can't penetrate.

    How do I vent this situation? It's a second floor and the joists run perpendicular to the tub. Ideas?

    Screen Shot 2014-04-14 at 10.00.00 PM.png
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,294
    Location:
    Bothell, Washington
    A 1.5" trap arm can go 42" before the vent
    A 2.0" trao arn can go 60" before the vent.

    Do those windows go all the way to the floor?
    An inspector like to see a horizontal vent 6" above the flood level of the tub.
    When it meets other vents, it would need to be 6" above those vents. With a 36" countertop, that would be 42" from the floor.
  3. whackit

    whackit New Member

    Messages:
    21
    Location:
    Los ANgeles
    the windows don't go to the floor but I can't penetrate the floor to ceiling posts at the end of the window so i can't go horizontal in that space. the shortest run to vertical (from beneath) because of the window size is 6'6".
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,032
    Location:
    Cave Creek, Arizona
    When I have been in that situation, I have used an "island waste yoke vent" system. The "yoke" would be in the wall under the windows, and the "vertical vent" would be outside the steel posts.
  5. whackit

    whackit New Member

    Messages:
    21
    Location:
    Los ANgeles
    That was my first idea. Inspector said he wouldn't allow it because windows go to same level as tub, putting loop below rim (after sill plate etc).
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,032
    Location:
    Cave Creek, Arizona
    Well, the return bend would still be above the tub's overflow, and if the tub had to be full before it started draining, you would have a good indication that something was wrong. AND, when an island vent is used, there is seldom a way to have the return bend above the countertop, and a sink does not even have an overflow. So if he allows it for a sink your tub should be a slam dunk.
  7. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    I'd run 3" under the tub and waste stack vent it. the lateral can then go 13' before hitting a vent
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