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Thread: Do you think a 3-1/2" vent stack is moronic? I do.

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  1. #1

    Default Do you think a 3-1/2" vent stack is moronic? I do.

    My vent stack roof boot is leaking. I'm guessing it has something to do with a 3" boot over a 3-1/2" vent stack.



    Is my roofer a moron or the plumber? I'm guessing the latter since boots come in 3" and in 4" and nothing in 3-1/2" that 10 mins of Google can find... I wonder what you think.

    I'm thinking I need to cut it off in the attic and make it 3". 4" if the city says so. Not a big deal... I just hate fixing other peoples' stupidity, and I think there was some involved.

    Also: separate rant. Anders Lign compression fittings (the ones with the integrated sleeve in the compression nut) are crap, and it's all the home stores sell now. 4 for 4, two different boxes of type-L 3/8" soft copper tube, all leaked. Going back to John Guest fittings

    Thanks for letting me vent

    Ha ha, get it?

  2. #2
    Illinois Licensed Plumber SewerRatz's Avatar
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    Default

    Quote Originally Posted by hawkeyeerik View Post
    My vent stack roof boot is leaking. I'm guessing it has something to do with a 3" boot over a 3-1/2" vent stack.



    Is my roofer a moron or the plumber? I'm guessing the latter since boots come in 3" and in 4" and nothing in 3-1/2" that 10 mins of Google can find... I wonder what you think.

    I'm thinking I need to cut it off in the attic and make it 3". 4" if the city says so. Not a big deal... I just hate fixing other peoples' stupidity, and I think there was some involved.

    Also: separate rant. Anders Lign compression fittings (the ones with the integrated sleeve in the compression nut) are crap, and it's all the home stores sell now. 4 for 4, two different boxes of type-L 3/8" soft copper tube, all leaked. Going back to John Guest fittings

    Thanks for letting me vent

    Ha ha, get it?
    So the inside diameter of that stack is 3 "? The O.D. of standard 3" PVC Schedule 40 PVC pipe is 3 " but the inside is 3". So apparently its the wrong roof flashing.

  3. #3

    Default Amazing

    SewerRatz, you are the reason I posted this. Sometimes you just need slapped by a stranger. It IS a 3" pipe.

    I still think a 3-1/2" vent stack would be moronic. Thinking 3-1/2" OD = 3-1/2" Sch 40 is more moronic. Thank you sir. Maybe the sewer gas made me delusional.

  4. #4
    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by hawkeyeerik View Post
    SewerRatz, you are the reason I posted this. Sometimes you just need slapped by a stranger. It IS a 3" pipe.

    I still think a 3-1/2" vent stack would be moronic. Thinking 3-1/2" OD = 3-1/2" Sch 40 is more moronic. Thank you sir. Maybe the sewer gas made me delusional.
    *chuckles* It is a common mistake lots of people make.

  5. #5
    Plumbing Designer FloridaOrange's Avatar
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    VTR's here typically have a lead wrap flashed into the roof.

    Similar to this.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  6. #6
    Plumbing Designer FloridaOrange's Avatar
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    And it also keeps the pvc from direct light.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  7. #7
    Master Plumber-Gas Fitter shacko's Avatar
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    Quote Originally Posted by FloridaOrange View Post
    VTR's here typically have a lead wrap flashed into the roof.

    Similar to this.
    Hard to believe that someone is still using lead flashings on vents, thats pretty close to passe.

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