Planning on moving main stack

[acjensen]

Hi all, this is my first post, but I've been a frequent reader on this forum for quite awhile.

My first question is - is there any reason that my main soil stack must be all vertical? It sits inconveniently 3 feet from the outside wall of my basement, and I'd like to finish that room and eventually turn it into a laundry/bathroom I'd like to bust up the slab and move the pipe to the outside wall, making an 90 near the ceiling and going down below the slab and meeting back up with the sewer line.

If that's kosher, I've got a couple other little questions about how to tie things back into said stack...

mainly the toilet, see pictures below.




Your expert help would be greatly appreciated!

[acjensen]

i should clarify, i didn't do that hack job with the laundry sink into the cleanout... it was like that when I bought the house, one of many things I hope to correct by doing this. Also, the toilet is a 4" to 3" reducer, wouldn't this be a great place for clogs to happen? It doesn't help that I have an older american standard low-flow toilet... Eventually want to replace with a TOTO!

[cwhyu2]

The best way that I can see is to open up the the floor and extend the
horizontal pipe under ground to where you want your stack to come up.

[acjensen]

got that, the things i'm more concerned about are above the slab... i was wondering if option 1 or 2 is best for the wc meeting the main stack, or if there's a third way that's better?

[acjensen]

i'm thinking option 2 is best, with the vent slightly up from horizontal on the toilet line. I'd like a second opinion, though...

[leejosepho]

Option 2 looks fine to me, and yes, I would definitely get rid of that 4-to-3 reduction under the toilet.

[hj]

Option #1 would be completely improper. #2 is better but you might still need a tub vent depending on how the connection were made, and there is almost no "legal" connection with that arrangement that would not need a separate vent. And, I ALWAYS install toilets with that "4 x 3 reduction".

[acjensen]

i was planning on venting the tub... thanks for the advice, what is the purpose of the 4x3 reducer? I'll do it that way if there's good reason to. Is it because the 4" pipe can have more air in it?

[patrick88]

option 2 looks good and pull vent for bath. I think the 4" to 3" is more a personal pref more than anything i 4" to 4" works and 3" to 3" works. If you ask 10 plumbers how to do something you will get 10 different answers. more or less

[leejosepho]

I ALWAYS install toilets with that "4 x 3 reduction".

Even horizontally, like in the picture?

[geniescience]

option 3 is with a vent going into the tub line. Can you draw that?

... making an 90 near the ceiling and going down below the slab and meeting back up with the sewer line. ...

What dimensions will the ninety degree turn take in your basement ceiling?

David

[acjensen]

What dimensions will the ninety degree turn take in your basement ceiling?

i guess i don't understand this... the 90 is from horizontal to vertical, if that's what you mean, not all horizontal. ar3e long sweep 90's preferable at any point in option 2?

[acjensen]

here are a couple overhead drawings of the existing and proposed layout.
the scale is 4 squares to the foot. I think the proposed one looks good, let me know if you guys see anything that needs work.

[statjunk]

I remodeled a basement once where I encountered that same problem. Instead of moving the stack, I moved allthe services over to the stack and created a large utitity room. I remodeled the rest.

Is that a possibility in your case?

Just seems like a lot of work to move a pipe 1.5'.

Tom

[got_nailed]

I would use sweeping 90* bends.

As far as the 4 to 3 I will always use 4 inch unless I have to run a pipe through a 2x4 wall then I use a 4 to 3.