How to cap unused, but connected, vent?

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vent_consolidator

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I'm in the process of consolidating 3 roof penetrations into a single for an upcoming roof replacement. I've done DFU and length calculations for sizing to include all current fixtures, however - one is an old galvanized vent pipe that was formerly for kitchen sink drain. This is now PVC to the main drain with a studor that works without issue. There is a cleanout below this vent in the basement. I'm assuming this to be an old, separate line still tied into sewer with the drain capped behind cabinet back.

In the attic, it is basically unaccessible on exterior wall where roof and eave meet (probably 9" workable space) and approximately 30' from the other vents. Can I safely cap this off in the attic or does it need to be tied in with the other vents?

Thanks!
 

WorthFlorida

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Cannot say for sure until you know if the other end is connected or not. Most likely it's not. If you can remove the clean out plug. Hopefully it's dry. Then run faucets around the home. No water then you're OK.
 

John Gayewski

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Can you go on the roof and blow air through it to check and be sure it's not connected to anything?

How are you gonna cap it if it's inaccessible?
 

vent_consolidator

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I'm going to be able to cap it, with difficulty. Extending it is another story. I really want to avoid the battle, and expense, with extending if unnecessary.

I will clarify that it is not connected to any fixtures in the home, but is still connected to sewer.
 

Jeff H Young

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I would expect a abandoned vent that goes through the roof and is open on top and then somewhere down inside the house you cap it off , would not be legal But I cant remember a code its no longer part of the plumbing system but it just catches rain sure dosent seem right but Ive never looked it up. Legal or not Id call it poor practice.

I think a better choice is connecting the vent to the old drain just having an extra vent.
 

vent_consolidator

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Cannot say for sure until you know if the other end is connected or not. Most likely it's not. If you can remove the clean out plug. Hopefully it's dry. Then run faucets around the home. No water then you're OK.

I know it's connected, somewhere out in the yard. The vent still exists, so the rain goes somewhere. Vent is straight to main drain/sewer. No fixtures in the house are connected.
 
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