Offseting waste stack
Can the waste stack be offset after the branches tie in? I would like to run a waste stack from the second floor through the slab to the building sewer.
My builder says this cannot be done because a column footer is in the way. As a result of the footing the stack must enter the slab 12" away from where it will run on the first and second floors.
Can this offset be done? And, if so how far does the offset start from the last branch fitting entering the stack?