Toilets, Sinks, Showers, Tubs and Disposals - Wall mount toilets...

We are going to remodel the main floor bathroom this winter. It will include replacing the iron stack with PVC from the roof down to where it has already been cut, about 10" off the basement floor. We would really like to put a bathroom in the basement.
We have an idea that we could put a wall mount toilet there by adding a sanitary Y fitting to the bottom of the new stack, thus avoiding breaking up the floor. I would be able to build a sturdy frame, lots of room around the stack. I would probably run heavy wood or steel studs from the cement floor to the floor joists overhead.
If anyone has comments or advice I'd like to hear from you. We are just planning right now and will begin around the holiday vacation...

Thank you all for your helpBeer 4U2

If you plan to put in a full bathroom with a tub or shower and a sink just adding a wye to the stack won't work, plus anything tied into the bottom of the stack will need to be vented; that means that you will have to run a 2in. minimum vent line and tie it into the main stack 42in. above your upper floor. Using a wall mount toilet is fine, but we need more planning if you want to install other fixtures. :confused:

What if we just add the toilet... Will it need a seperate vent? I plan to have it located right off of the stack...

Is it OK to use the existing stack to vent a new basement toilet?

I will run a vent line if we do add a sink and shower. The walls will be open so it wouldn't be any trouble.

What if we just add the toilet... Will it need a seperate vent? I plan to have it located right off of the stack...

Is it OK to use the existing stack to vent a new basement toilet?

I will run a vent line if we do add a sink and shower. The walls will be open so it wouldn't be any trouble.

Any fixture downstream of other fixtures has to have a vent, a toilet where you propose is downstream of all the upstairs fixtures, sorry.

Milemaker13,

It's never as simple as it seems, but the LAST thing you want to do is flood the basement with the main waste line. There are ways that work, and there are ways that don't. Do it right or you WILL have a crappy mess.

I don't want a crappy mess:madhell:!

So, just to be clear... If I install a wye about, say 16" up from the floor on the main stack, I need to then install a reducing (4x2x4) tee into that wye. Then my closet bend fitting would go into that tee. The 2" vent port would be run up into the attic where it will tie into the main stack thru another tee...


Just some more questions.... I want to better understand so there is no room for error.

The main floor toilet is not seperatly vented. Is that because it is the first thing going into the stack? Or because there isn't any length of pipe between the toilet and the stack?

If the main floor toilet was, say, about 6' away from the stack, would it then need to be seperatly vented?

I don't want a crappy mess:madhell:!

So, just to be clear... If I install a wye about, say 16" up from the floor on the main stack, I need to then install a reducing (4x2x4) tee into that wye. Then my closet bend fitting would go into that tee. The 2" vent port would be run up into the attic where it will tie into the main stack thru another tee...


Just some more questions.... I want to better understand so there is no room for error.

The main floor toilet is not seperatly vented. Is that because it is the first thing going into the stack? Or because there isn't any length of pipe between the toilet and the stack?

If the main floor toilet was, say, about 6' away from the stack, would it then need to be seperatly vented?

Unless you need 4in. for the toilet you are going to install you can use a 3x3x2 fitting, come out of the 3in side for the toilet and use the 2in for the vent (don't lay the 2in. flat) and run the 2in. to your main vent.

Your main toilet dosen't have any fixtures above it and assuming it's 4in it shouldn't need a vent 6ft. away from the stack. :)

So the layout sounds good? Great!

One more question- Can I use the same 2" pipe to vent both the toilet and sink? Or do I need to have 2 seperate 2" pipes running up into the attic?

Thanks again!

One 2" vent for both and run it over to the main vent if possible so that you don't have to cut another hole in the roof.

All of the vents have to remain vertical until you gt at least 6" above the flood rim of the highest fixture (6" or more above the lavy before you can run the vent horizontally.)

Sound great. I will run the 2" up to at least ceiling height of the main bath, where it will tie into the stack via another tee. I am going to replace the stack all the way up to the roof with PVC.

Thanks alot for the info!