I am planning on putting a 1/2 bath in my basement. There is an existing 3" cast iron hub stack near the new location. I will try to include a picture. The antique water softener tank and other debris has since been removed.
What I am thinking of doing is removing the 3" wye with cleanout and replacing it with a 3" sanitary tee, then putting the cleanout wye above the new sanitary tee. Since there is a hub just above the floor level, this could be done without needing to bust up the floor. The existing stack now services a bathroon on the first floor.
According to the Charlotte catalog, a the new sanitary tee would put the new wasteline at about 7-1/2 inches above the floor level. Several manufacturers make European style rear-outlet toilets, such as the Jeanette Dual Flush European Rear Outlet Toilet. Their literature indicates that the waste line should be 7" +/- 1". The desired location of the toilet would be just to the other side of the 4" cinderblock wall that can be seen at the right of the picture. This would require a total horizontal pipe run of less than 12 inchs.
I have three questions or areas opened to discussion:
1. Could a second toilet be added to this stack as proposed?
2. Could an inch or so be cut off the bottom of the sanitary tee fitting if needed to lower the waste line?
3. Would PVC or non-hub cast iron be a better choice? I would prefer to keep it all the same unless there is a good reason to change.
Thank you for your input and any suggestions.