Toilet Drain retrofit question

[kinglake]

I've inherited an hold house plus shop, both plumbed with cast iron. I'm attempting to add a bathroom to the house and need to tie in the toilet drain to the main stack. I have the venting and water supply worked out, but the only way I can figure out to tie in to the main drain requires a 180 change in direction. This change could all be in the vertical direction if needed as it is in the crawlspace. If I use 2 long sweeps to make this direction change, does anyone foresee any issues? Would vertical or a less severe angle be best?

No code and no inspections, but of course still want it to drain properly.

 

[alexb2000]

I've inherited an hold house plus shop, both plumbed with cast iron. I'm attempting to add a bathroom to the house and need to tie in the toilet drain to the main stack. I have the venting and water supply worked out, but the only way I can figure out to tie in to the main drain requires a 180 change in direction. This change could all be in the vertical direction if needed as it is in the crawlspace. If I use 2 long sweeps to make this direction change, does anyone foresee any issues? Would vertical or a less severe angle be best?

No code and no inspections, but of course still want it to drain properly.

Hard to envision without a picture. How about replacing an existing wye with a double wye in the main stack where the existing wye branches off for the drain?

 

[Kaizen]

agreed more info needed. pics or draw it out. are you running pvc and just tapping into the the cast iron stack? why is sink not going where toilet is going?

 

[rburke65]

Without seeing a photo(s), A double wye would be better than a 180* turn.

 

[kinglake]

There is no way to get a photo that would help due to it all being in a small crawlspace. The existing drain is going to a bathroom on the other side of the house. There are not any wyes at all currently and I would much prefer to not have to cut the cast iron main and put one in for this bathroom. There is an existing SDR pipe that runs into this cast iron drain from the kitchen but from the opposite direction of the new bathroom. I'd like to put the PVC (with bushings) long sweep tee in the SDR, with the sweep pointed vertical, then a second long sweep vertical to make the 180 change in direction. I have the space to orient the sweeps horizontal or really any angle, but I thought vertical might help with drainage.

 

[Kaizen]

If you can see it a pic can be done. Sounds like the best thing is cutting the stack. Are your seeps then going to the other side of the house? Still hard to visualize your mess. Draw it out maybe


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[KenC]

Without seeing it, I would recommend cutting the cast iron if that will provide the most direct line with the fewest fittings. Sawzall with the correct blade and speed handles it quickly/easily. Fernco rubber connectors puts it back together.

Straightest and shortest runs are always best.

 

[flat350]

You sure you have SDR pipe inside the house?

 

[kinglake]

You sure you have SDR pipe inside the house?

Yes, its obviously not original but clearly labeled SDR35. Appears to have been used as a replacement for a cast iron branch line.

 

[flat350]

What your'e trying to do will work ,it's not the ideal way.You'll find fitting selection on SDR fittings to be limited compared to sch.40.