I am going to be adding a bathroom to the basement... when I patch into the main stack, should I patch in with a y tee further down the run from the 90 bend. If so, how far should I go before adding the additional toilet, sink and tub lines. I was wondering if I should vent the toilet, and if I can into the main stack using it as a wet/dry vent. I was also planning on venting the sink into the stack be adding a tee 40" up from the finished floor. I was not going to vent the tub since the overflow should add the air needed to vent the drain. Also, should I run the toilet independently into the drain from the tub or can I have them all connect and run through each other? And to patch into the drain line under the concrete floor, can I use a rubber boot? Thanks for the help

Rule of thumb is if it drains you need a trap, if it has a trap you need a vent. In this case you likely also need a permit and much more help. Have you ever done a rough in for a bath? The size of the drain for a sink is different than a shower and that is different than a tub and all are different than a toilet.

I plan on using 4" for the toilet and 2" for the sink and tub. I was going to vent the toilet and sink with 1 1/2" and the overflow should vent the tub? Your expertise is appreciated

You'd be off on 2 out of 3 with that. You really need to check your code requirements and what the inspector will approve. Shower takes 2", tub 1 1/2" and sink 1 1/4". If you go overboard you will not get the scouring action needed, toilet can also be a 3" if you want. Where do you live?

I live in Ohio. I am aware of being able to use 3 or 4 for the toilet, but is the vent OK to be 1 1/2? And am I correct in that I don't have to vent the tub since there will be an overflow? What about as far as where I tap into the main horizontal drain line. As I said, I was planning on adding a t on the main stack as the vent and didn't know if that would be suffice or if I should just put in aavs? What about if I need to run the toilet, sink and tun independently to the drain? Thanks for your assitance

My friend,
I just went through your first post and EVERY plan you cane up was either out of code or illegal. Not a single one that wouldn't get the job red tagged. Face it! You're in over your head. Putting in a basement bath would be a major undertaking for a licensed plumber. If you want me to, in the morning I'll go over your post with you line by line, show you were you're wrong and tell you why.
If you'd like me to do that just add a post telling me. Let me give you advice backed by over 50 years in the trade.
Get three estimates and tell them that you'll do the labor work, such as breaking up the cement and hauling it away and digging the trenches etc. By doing 6that you'll save a lot of the labor costs. I wish you well and you sound like a good hard worker but you're no plumber and a major remodel is no place to learn. I wish you well and I don't mean to heavy up on you but I wasn't a paragraph in your post before I thought, " This guy's way way out in deep water. But I'm going to give you a lot of kudos. Ya got a lotta conjoiners to walk into a job that big with no experience. Best of luck, Tom

Being a retired plumber in Ohio I know the state code. You should use a y for the bathroom tying it in at least 5' downstream from the vertical stack. The toilet can be 3" with the vent 1/2 the size, or 1 1/2" and should tie back into the stack 6" above the flood level rim of the highest fixture or go out the roof seperatly. If you also are putting in a shower it should be 2" with a 1 1/2 vent. If you you are doing a tub you cannot vent it with the overflow. The tub should be 1 1/2 with 1 1/2 vent. The sink waste should also be 1 1/2, but it can be 1 1/4 with a 1 1/4 trap. All these vents can tie together and be tied in above the highest fixture or go out the roof. Since I don't know if this a one or two story house I don't know how feasible this is. You can also vent the toilet by taking the y for the sink as the last fixture before the toilet and using the sink for the toilet vent. AAV vents are legal in Ohio but not for the toilet and I would not recommend them except as a last resort. Like what was said before this is a job for a licensed plumber unless you have a lot of experience doing plumbing.

Puff, Haven't you read the first post? And your still laying out the job like he's going to do it. About the only thing you said that really helped was,
Like what was said before this is a job for a licensed plumber unless you have a lot of experience doing plumbing unless you have a lot of experience doing plumbing! A lot of experience doing plumbing? You really didn't read the first post did you? Because if you had you would have realized he was in way way over his head.
I said last night I'd go over the post and point out any inaccuracies I might find and then perhaps I'll go back and reread yours.
Phiamonstere my friend, I'm not doing this to put you down or embarrass you but to show you that you need much more experience before you take on a project of such magnitude. You say:
if I can into the main stack using it as a wet/dry vent. No! That stack is anything but dry, The entire upper floors of your house discharges into that srack. It's not a vent stack, it's a stack vent. ( a little plumbing lingo)

I was also planning on venting the sink into the stack be adding a tee 40" up from the finished floor.Can't do that either.

I was not going to vent the tub since the overflow should add the air needed to vent the drain Another plan just died! Didn't you believe Bob when he said,
Rule of thumb is if it drains you need a trap, if it has a trap you need a vent. Ya got to vent the tub.

should I run the toilet independently into the drain from the tub r? And another plan just went south! You can't discharge a 4" toilet line into a 2" tub drain. Kind of works the other way around.

can I have them all connect and run through each othe
Nope again! I'll put up the drainage for a bath rough in. Just pretend the shower's a tub.

And to patch into the drain line under the concrete floor, can I use a rubber boot? I wouldn't but ask the inspector.
As promised, this is how a basement bath should go down.
As I advised. get a licensed plumber in to do the work while you cut down on the labor bill by doing the scutt work. I wish you well and good luck, Tom Puff! See what I mean?

Speedball: I agree he is over his head to do the job himself, but if he decides to, it's his decsion and I gave him the correct way of doing it in Ohio. Your shower diagram won't fly in Ohio if that was your plan to do the job. I know you may have other options but the one you show won't fly. You can't vent the toilet that way. The fixture ventimg the toilet has to come off the main branch the toilet is on.

His decision to do what? Get his place red tagged? And you would help the process along? Going to teach him how to use a set of snap cutters? Going to hold his hand while he ponders what the difference between a vent stack and a stack vent?
It's seldom on this page that I advise calling in a plumber.
We're here to give advice on home repair and remodels but in this case think the best advice you can give would be to call a plumber.
You sound like a competent plumber and 'm glad to have you on board but some times we just have to back off and advise calling in outsider help. Do I think he hasn't the brain power to do the job? No! It isn't his smarts that I question. It's his skills and plumbing knowledge that's woefully lacking and to let him start the job himself would leave a bad taste in my mouth. You're fairly new here but in time you won't be quite so eger to jump in and lay out a entire project.
Puff, We're here to help ( and I thing we're pretty good at it) but we can't fix them all. There's a time to jump in with a solution and a time to back off and say "
Call a plumber. This is one of those times. If nobody said it before, Welcome to the Plumbing Page, Tom

Hi all. Im nowhere near Ohio, not even sure what code they are under, so Im just here to gain a little knowledge of various codes across the country. In my area, all toilet vents require minimum of two inch. Just curious if indeed Ohio allows 1 1/2 for toilet vent. I was under the assumption that 2" toilet vent was kind of the standard all across the US. Just wondering. Always nice to further my knowledge. That's one of the great things about this site. We can see what codes are in other parts of the world. Take care guys.

@mygirlsdad77, In Ohio it is 1/2 the size of the toilet waste, 2" for a 4'waste and 1 1/2" for 3". Ohio goes by state code but each city can ugrade the code above state levels, an example would be state code allows M copper above ground but many cities and suburbs require L copper above ground which overides state code.

@speedball, Thanks for the advice, I will try to be more careful with my answers.

Thanks for clearing that up puff.

So, I did not intend to start controversy here... I am simply asking questions about plumbing... this is the plumbing questions forum right?

First of all, my first post was probably not the clearest picture of what I was intending on doing, and for that, it is my fault if I seemed like an idiot which seems to be how I am being perceived. I have done rough in plumbing before, by no means am I a licensed plumber, but I do have abilities.. it is just the know how for how to run drain lines that I was asking, the order, how to vent, etc. And I did call in licensed plumbers for quotes, three of them actually, and for just the rough in drain work, with me doing the grunt work, the average cost was $1500. With the main stack 5' away that sounded like robbery. Let me preface by saying that my mother in law recently passed, my father in law is moving into our basement, my wife is pregnant and I want to give my father in law his own space, but I don't have the funds available to spend $1500 on rough in plumbing only. As I said before, I was under the impression this was a home repair/plumbing forum and I was seeking advice... if you point out my thoughts as wrong or ignorant, thanks, but I was looking more for help than criticism... I know you guys know this stuff and it is easy for you... thus the reason I am seeking guidance.
Puffmugs... thank you very much for trying to help me. I have already spoken with a plumber cousin who is out of state and am drawing the floorplan to have him review my layout and get further assistance.
Speedball... I appreciate that you are trying to help... but you need to work on the bedside manner... please don't try to tell me what I am and what I am not going to do... I have a wife for that.

For all the advise and guidance I got on this forum I thank you... hope you all good will in the future and thank you for your time.

you need to work on the bedside manner
You're absolutely correct! I'm no Doctor Phill. I'm not here to make you feel good. I 'm here to give the best advice I can and the best advice I can give you is don't try this job alone. Get a licensed plumber in and you help and learn.
You say you want to learn plumbing? Get a job as a plumbers helper, that's how we learned.
I don't mean to heavy up on you but this isn't the Plumbing Page function. We are not a training ground. This is not why we're here and , quite frankly, taking the time to lead you through your rough is takes valuable time from answering repair queastions. I do wish you well but my advice still stands. Regards, Toim

phiamonster, good luck to you on your project, this will not be a easy job to do, maybe your cousin can guild you through this. If you have anymore questions I am sure there is plenty of experts willing to advise you on this forum.

My opinion: I suggest you hire licensed plumber for the rough-in. You can set the finish yourself. Milo