I have a house that has a half bath on the lower level I want to add a
shower. The only new problem I am faced with is this is a concrete floor, no
crawl space under this one. The sink drain is the closest drain and it goes
straight into the floor. This house is forty years old and is all cast
drains and vent with copper drain lines connecting to the cast ones, no PVC
here. I plan on just busting up the concrete to see what is there. Any one
ever done a job like this? Any input on what I might find would be a help, I
would like to know how deep the sink drain goes down before turning so I can
figure out if the shower will be flush with the floor or will I need to
raise it up?