We need one of our resident structural engineers to chime in, but having tubing in the floor would weaken it in my mind...what's the grid spacing on the PEX? Is there any rebar, fiberglass strands or wire mesh in the concrete...that all weighs into the mix as well.
Do you know where the PEX is in the floor and will you be able to center the legs between two parallel runs of the tubing?
Mike B
