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  1. #1
    Join Date
    Mar 2007
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    Ft. Myers, FL
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    Default Capped plumbing vents, New construction

    Have never encountered this before. Inspection on new construction, the two plumbing vents on the roof were capped. I was looking forward to running the water inside and watching how it was going to drain. There was a mechanical vent in the kitchen island, and one in the garage by the boiler and hot water storage tank (not sure what that one was venting.) Well to my surprise everything drained great, and I used lots and lots of water, including a big jacuzzi tub. I though maybe there might be some mechanical vents in the attic, but the venting system was normal, except that it was all 4" PVC until it went through the roof. Why is the plumbing draining OK, I am baffled.Is it because of the 4" PVC in the attic, even though its capped off??

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    Paul Kondzich
    Ft. Myers, FL.

  2. #2
    Join Date
    Mar 2007
    Location
    Oregon
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    Default Re: Capped plumbing vents, New construction

    The caps must be there to keep rain out

    I'd bet they were put in place to pressure test the system and the plumber forgot to remove them. Venting is kind of a mystical thing sometimes. I've seen things drain okay with no venting whatsoever. At least visually it's okay. You never know if the traps are getting sucked dry. And, sometimes you'll hear all kinds of funny sounds when everything looks okay.

    In any case, the builder should remove them.


  3. #3
    Join Date
    Mar 2007
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    Healdsburg, CA
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    1,741

    Default Re: Capped plumbing vents, New construction

    Caps should not be sealing plumbing vents and exposed to weather PVC piping should be painted to help protect it from untraviolet sun rays.

    Jerry McCarthy
    Building Code/ Construction Consultant

  4. #4
    Join Date
    Mar 2007
    Location
    Connecticut
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    1,828

    Default Re: Capped plumbing vents, New construction

    Did you give them a twist?


  5. #5
    mathew stouffer's Avatar
    mathew stouffer Guest

    Default Re: Capped plumbing vents, New construction

    Paul hit it. They are capped when the system is pressure tested.


  6. #6
    Join Date
    Mar 2007
    Location
    Ft. Myers, FL
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    Default Re: Capped plumbing vents, New construction

    Yes Wayne, I tried to get them off but they were glued.

    Paul Kondzich
    Ft. Myers, FL.

  7. #7
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    1,984

    Default Re: Capped plumbing vents, New construction

    Plumber probably didn't get his last full check. That's why he 'forgot' to cut them off.

    www.aic-chicago.com
    773/844-4AIC
    "The Code is not a ceiling to reach but a floor to work up from"

  8. #8
    Join Date
    Mar 2007
    Location
    Knoxville, TN
    Posts
    2,446

    Default Re: Capped plumbing vents, New construction

    I see them sometimes where someone has just whacked them with a hammer to open them up. Not all that clean of a job.


  9. #9
    Join Date
    Mar 2007
    Location
    Succasunna NJ
    Posts
    574

    Default Re: Capped plumbing vents, New construction

    Something similar happened to me about 6 years ago. I was inspecting a 10 year old house built on a hillside. Couldn't get my ladder up to the roof, but from the ground I could see a cap was still on a vent.

    Seller was explaining to the buyer the radon system she had installed when she bought the house. I explained it was installed wrong, the fan was in the basement, but no, she insisted she only hires the best to work on her house. Lo & behold, the radon came back at just over 16; they never removed the cap. While she thought she was safe, she wasn't. I don't know if she sued or not.

    Darren www.aboutthehouseinspections.com
    'Whizzing & pasting & pooting through the day (Ronnie helping Kenny helping burn his poots away!) (FZ)

  10. #10

    Default Re: Capped plumbing vents, New construction

    They may also be there to keep the A$$hole construction workers from dumping crap down the vent lines. I have had to cut open systems several times to remove all kinds of stuff. Wood, bundles of stiff wires that are used to hold batt insulation in place, smaller pipe etc. Not sure why they do that but a knock-out glue cap usually keeps them out. They should be removed on final/finish.

    True Professionals, Inc. Property Consultant
    877-466-8504

  11. #11
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,248

    Default Re: Capped plumbing vents, New construction

    Would that rubber boot flashing fit over that cap without tearing?

    If not, that would indicate that the pipe was capped *AFTER* the roof was installed.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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