Hello, new to a lot of this do it yourself stuff. Here is my delema, I have an unfinished basement in which I am enclosing the area for the bathroom. It has a 2 1/2 in pvc pipe coming out of the concrete next to the concrete block foundation, then there is the larger hole I'm assuming for the toilet about 12 inches in front and to the right. Futher up about 5 feet is another 2 1/2 inch pipe, I'm assuming this one would be for the sink. My problem is using the pipe next to the foundation wall for the ventilation pipe, how far up do I have to run this pipe? I'm just about finished with this whole project but can't put the last wall in place until I have the true answer. Do I need to tie it into the other ventilation pipes, or can I just make sure it's higher then the toilet and leave it open behind the wall. Any help would be appreciated, I have to go real bad.....

 

Welcome to the forums! You definitely have to tie it into the venting system of the house. Depending on how old your house is, some contractors extend the vent pipes into the basement, planning on future installation of fixtures, especially if they stubbed up for it. Look in the ceiling area and see if there is a vertical 2" pipe with a cap glued onto it. If so, that is your vent pipe, and you have to tie your other plumbing into it. The vent must extend to the roof and out to the atmosphere, so you can't just extend it above the ceiling.

 

Appreciate the info I know where the tie in is just as you described, was hoping I was done but now to do more measurements and glueing. Thanks for the advise....

 

Be careful when you cut the cap off, as the vent has probably collected water!!

 

One other quick question, could I cap the one close to the wall and T off the one which will be the sink drain and run that one to the rest of the system?

 

Well the problem here is we,you do not know exactly how these pipes were roughed in. Typically for one bathroom, you should only have one pipe coming up through the floor used as a drain and vent called a wet vent, and if done properly will even include a tub/shower. My question is why there are 2 lines coming up through the floor. Without knowing that answer, I would make sure to tie them both into the vent system. It sounds like you lucked out and found what we call a future vent in the basement which will make it quite easy to pipe to. Newer codes do not require the future vent any longer. I thought it was a great idea.

Pictures may help us see what we are dealing with here.

 

really plumbgods? we dont have basements around here so i just go by hearsay on these boards. i thought more codes were requireing them. maybe it is due to the aav's being authorized for bathrooms?

the pipe behind the toilet is usually used for the sink also. the other pipe should be for the tub and i bet it has a trap in the floor also. tap the concrete around that pipe and see if it sounds the same as 2' awayif it doesnt then there is a tub box out within like an inch or so of the top of concrete

 

Mark, I, too thought it was a super idea. I still incorporate them in, because I am usually the one to do the remodel on the basement in a few years. I also use capped off 2" gray conduit stub from the attic to the breaker box and from the attic to the basement for future home runs of electrical cables.
I caution the terminated conduits must be capped off for future use and sealed completely with cables installed to prevent a chimney effect in the event of a fire.

 

I still install future vents on my jobs, but according to IPC 2006, they are no longer needed, unless that is a NH adopted code.

Be careful if you do find one. If it has a cap, you may want to drill a small hole in the bottom and let any water out before cutting the cap off or you will have a shower. Some plumbers I know used to use a female adapter with a plug to stop that from happening.

Dan, I think you are probably correct as to the referencing of the pipes, but without a picture, it is hard to be positive.

 

I appreciate all the help as I am not an expert at this, the picture is a good idea, I took several only to find out you can't send attachments, my home email is campbelljd@comcast.net if you can send me your email I will send the pictures. I don't want to put all this together only to find out I have to tear it all aprt because I didn't get all the facts. The room is a little larger than 5 feet by 6 feet. The left wall by where the sink is going is the one I built as the rest was already done when I bought the house but never finished.