I'm going to look at a job tonight, pipe in concrete floor is leaking. I told the guy on the phone that the best option would be to bypass the pipe(s) and run the pipework above the floor, but he doesn't think that is practical. So if I dig it out and replace, what's the best way to go? I was thinking to replace with plastic inside flexible conduit, without any joints if possible, but what about insulation? Is there any means of insulating the pipe in conduit, or just don't bother with insulation?