Another plumbing question

[bluedog225]

I’m finalizing my plans to plumb in the toilet at my place. At the end of the day, it’s going to be a 4” flange on the second floor located almost directly above the 4 inch stub for the septic coming out of the floor 12 feet below. There’s about an 18” horizontal offset between the flange and the septic stub.

I’ve convinced myself that there’s no problem using a couple of 45s to get it directly over the septic stub. With a 4”x4”x 2” 1/8 combo wye leading to the vent through the roof.

That’s it. The rest of the water will be going out of gray water vented system.

I’m continuously learning that I know nothing about plumbing. I’d wanted to check in to see if this layout would work.

Many thanks.

 

[rlitman]

The direction everything is going matters. Can you post a napkin sketch?

 

[CraigStu]

You could also search for 'Plumbing for Dummies' or 'simplified plumbing' or 'beginning plumbing' or similar. Some L or HD stores have a book section and I have to think there is something there for you.

 

[PopcornSutton]

Sounds OK to me.

 

[bluedog225]

Sure. Good idea. Pardon the 3rd grade drawing skills.

 

[manwithtools]

I think your plan for the 45's sounds solid if I understand it correctly. I think you are not supposed to use a combo-y in a drain stack, see image below. It's supposed to be a sanitary tee. I think you can use a sanitary tee in your layout in place of the comb-y, just need the right adapters / reducers.

 

[bluedog225]

I would have never guessed that. Thanks!

 

[rlitman]

I think your plan for the 45's sounds solid if I understand it correctly. I think you are not supposed to use a combo-y in a drain stack, see image below. It's supposed to be a sanitary tee. I think you can use a sanitary tee in your layout in place of the comb-y, just need the right adapters / reducers.

I know a combo-y is designed for it to be laying down with the branch facing up. Not running vertically with the branch coming in the side. That's exactly what a sanitary tee is made for. In this situation though, with the side being a dry vent and not a wet stack, I don't know if it matters.

 

[bluedog225]

It’ll be an interesting day if stuff piles up 14’ high in a 4” pipe from the septic tank to the vent pipe.