Do you need to add plywood over top of dricore subflooring system? We are installing a vinyl (laminate like) floating floor over the dricore. Our carpenter has screwed a layer of plywood over the dricore and insists that the floating floor requires it. Also, the dricore manufacture suggests that a vent cover be installed every 10' to allow for proper air flow. This was also not done. I have spoken to several people and received various answers to our delema, can someone please come to our rescue and offer some sound advice