vent through a wall

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Esquire, May 30, 2010.

  1. Esquire

    Esquire Plumber

    Messages:
    65
    Location:
    Newfoundland
    I got asked a question today and I'm not certain of the answer.

    There is plumbing in a square metal building. There is a vent that needs to terminate outside. Can the vent be brought out the side of the building? There are no windows or doors near the termination point. There is no eve above where it would terminate either.

    Could you terminate out the wall and 90 up to have it vertical (going above the roof level is possible too)? if run off water from the roof is an issue is hooding the vent acceptable? For some reason the owner of the building thinks he is more likely to have trouble with a leak at the room termination than at the wall termination point.

    Just wondering anyone has input on this and more so wondering what the code would think about it.
  2. shacko

    shacko Master Plumber-Gas Fitter

    Messages:
    561
    Location:
    Rosedale, Md
    Most areas do not allow plumbing on the outside wall of a building, but this could vary locally, you have to check with you local jurisdiction, sorry.
  3. Esquire

    Esquire Plumber

    Messages:
    65
    Location:
    Newfoundland
    The plumbing is all on interior walls it would only get to the outside wall where it is going to terminate.
  4. Terry

    Terry Administrator Staff Member

    Messages:
    15,014
    Location:
    Bothell, Washington
    Normally you would extend through the roof.
  5. krow

    krow Plumber

    Messages:
    906
    Location:
    Ontario, Canada
    It is allowable to go through a wall, but you need to exit at 45 degrees and extend to above the roof and any change of vertical direction must be 45 degrees. There should be no horizontal runs where there is a possibility of water accumulation.Minimum 3" diameter pipe

    Attached Files:

    Last edited: May 30, 2010
  6. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    Krow nailed it. In Canada you are allowed to have a vent outside of the building as long as the vent is always kept nominally vertical. And he's right about the 3" as well. You need it to be 3" because of frost closure. So this could really cause you some issues because if you're piping downstream of the vent isn't 3" already it needs to be!
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,651
    Location:
    Cave Creek, Arizona
    Frost closure would be a possibility with ANY extended outdoor pipe and the longer it is, regardless of the size, the more likely it is to occur, ESPECIALLY if the weather is such that there are few warm periods which would thaw any accumulation out of it. I doubt that Newfoundland has many warm Winter days.
  8. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    In Florida you can but it appears that's a rarity. No vented soffit or openings above and must be min. 10' above grade and you can exit 90* from the wall and use a wallcap.
  9. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    You right but the code is more referring to climates where you get REALLY cold. Where I live they never require you to increase to 3" for frost closure. But if you went 5 hours north they might....

    But the inspectors around here do like to see all 1.5" vents increased to 2" right before they terminate through the roof because of frost closure issues. How much does it help? Probably not much but they like to see it and they have the final say.
  10. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,651
    Location:
    Cave Creek, Arizona
    When I was in Chicago, EVERY vent penetration had to be at least 4", but pipes 4" and larger had to have it increased by 1". Here in Phoenix, I have seen installations where ALL the drain lines are on the exterior of the building.
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