I am proposing to install this 3/8 roll over radiant heat tubing. The tubing is inserted in 3/4" grooved plywood and I did not plan to cover it. When the tubing is inserted into the plywood it is flush with the top. Can this flooring be rolled directly over the recessed tubing or do I need a completely flush surface in which case I would need to install a thin sheet of lauan or 1/4 plywood. I can send a picture of the subfloor if that is helpful to facilitate a positive installation. Mike h.