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bryanp22 02-22-2012 09:59 PM

2" pipe on above sink in wall rusted out in a spot
3 Attachment(s)
I was replacing a pedestal sink and noticed I have a pipe above the drain pipe and hot and cold water pipes that the sink uses. This pipe actually has a decent size rust spot in the bottom of it. I've attached a picture of the sink area. It's a pipe that goes above the hole in the wall right below the mirror. It actually has a decent size hole in the bottom of the pipe now that I got some of the rust knocked away. I tried having my fiancÚ tape on the pipe and it seems that it goes into my basement and the pipe in the basement is capped. I've attached a picture showing the capped pipe. It's right next to another pipe that still is in use. That made me a little optimistic until we tried flushing a toilet. I can feel air moving in the pipe as the toilet is flushed. We have a two story house and the toilet right next to the pipe I feel more than when we flush the downstairs toilet. Anyone have any ideas on why it would seem to go to the basement and be capped, but then I could still feel airflow in the pipe when a toilet is flushed? I tried run the shower for a few minutes and I never get water to go through the pipe. What are my options? It feels like it is rusted out for about two inches. Would this have just been an abandoned pipe or some type of venting system? I looked in my attic and I see the vent pipes and it is a much larger pipe going to my roof. I don't see this smaller pipe. I am not sure what to do and am looking for suggestions. Is this something that I can just use epoxy on or do I need it replaced. Will a plumber just poke holes further down in my wall to see where it goes? Right now I am unable to really see where the pipe goes I just see it is horizontal in the wall.

jaydevries 02-22-2012 10:15 PM

it looks like to me it could have been for a future vent for something in the basement is there plumbing in basement for a bathroom or maybe for a lift station

DannyT 02-22-2012 10:15 PM

it looks like they put in an extra vent for future plumbing in the basement. you can cut it at the hole and cap it off or run it back down into the basement for a future vent.

bryanp22 02-22-2012 10:21 PM

What is a lift station? So to the left of the hole is where i believe it eventually goes down to the basement. To the right I have no idea where it goes. Does that change what either of you are thinking? So would I cut the pipe and cap both sides? I have no plans of adding any additional plumbing in the basement. I just don't want any leaks. So I'll have the thread the pipe or is this an acceptable alternative?
Would that be against plumbing codes?

jaydevries 02-22-2012 10:33 PM

lift station is a pump in basement that lifts up water to a drain

to remove cut pipe with sawzall or hacksaw if you have the energy then cap with vernco here is a link to the 2 sizes it could be and you should only have to cap the one that does not go down stairs

bryanp22 02-22-2012 11:09 PM

Should I be concerned that the first floor bathroom might be vented by the pipe going ultimately to the basement with the cap?

jaydevries 02-22-2012 11:16 PM

it isn't it will be connected to the larger pipe behind the toilet that is your main vent stack the large one you seen in attic

bryanp22 02-23-2012 01:40 PM

If I am cutting the pipe with a sawsall should I be worried about damaging the cast iron stack from the vibration of cutting the 2" pipe?

jaydevries 02-23-2012 04:05 PM

should be ok it is supported by 2x4 you could wedge something in hole of 2x4 to keep vibration down

bryanp22 02-23-2012 08:29 PM

2 Attachment(s)
Here are pictures of the rusty pipe and my repair. I ended up just putting in a piece of PVC.

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