I was just over at a friend's basement renovation project, i saw the contractor buried his brand new return pipe(silver colored and guesstimated at 1.5" in diameter) in a steam heating system with concrete. And on top of that concrete, there is about .5" of tile mortar mix and then tiles.
The problem I noticed was that, the concrete on top of the pipe is very thin, like maybe slightly less than 1/8 in thin? Could that be a problem if he chooses to put heavy stuff on top ????
thanks in advance.