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

  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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    Default

    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 nhmaster's Avatar
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    What it is is whoever installed the flange didn't realize that they are supposed to be tight, real tight and it takes a bit of push to get the pipe through so they slit it instead. Find the slitter and place the blame. Oh, yes you have to replace it now, it will leak forever.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    Default vent

    The "moronic" thing about a 3 1/2" vent would be the time and expense of trying to find ANY pipe or fittings in that size. You have a 3" vent pipe with a flashing that was installed by a moron. Unless the sleeve fits tightly around the pipe there is absolutely NO WAY it is not going to leak, unless you live in the middle of the Sahara Desert where it seldom, if ever, rains. The plumber may have furnished the flashing, but the roofer installed it while shingling. If he snipped it to install it, he was a moron, and if it was already cut and he installed it anyway, he was still a moron.

  9. #9
    Extreme DIY Homeowner Scuba_Dave's Avatar
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    Default

    Thanks for reminding me
    I need to put a flashing in for the future 3" stack on the new roof
    DIY Handyman (not 4 hire)
    I have enough to do to my own house

  10. #10
    Moderator & Master Plumber hj's Avatar
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    Default flashing

    Put a piece of pipe through it so that it is sealed. You can connect to the pipe later.

  11. #11
    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.

  12. #12
    DIY Senior Member TedL's Avatar
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    Note that if you carefully remove the "rubber" from a new, similar flashing, slide it down onto the pipe and adhere it to the cut rubber with, say, silicone, it will be raintight until you get around to replacing the full flashing, without any rush. It could last for years.

  13. #13
    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by shacko View Post
    Hard to believe that someone is still using lead flashings on vents, thats pretty close to passe.
    Still see them quite a bit down here. I also see alot of full rubber boots but whatever, I'm sure the OP got the point.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  14. #14
    Moderator & Master Plumber hj's Avatar
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    Default flashing

    Here they are almost all metal cones, other than lead when tile roofs are installed.

  15. #15

    Default Thank you all

    Thank you all for your input and commentary. This is how it is going to look until the fall.



    Questionable aesthetics,... yes. Patience to care,... depleted. House feels like it's falling apart faster than I can put it back together these days

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