..is a widely used system that I am familiar with. Engineered wood is just very fancy plywood, often 5 layers thick (top veneer is species of wood, ie oak,maple,cherry, followed by 3 layers of soft wood (ie; fir) and the bottom layer is the same as the top for stability. Planks that are 3" wide or more can be floated, like a laminate floor and installed over 3mm cork underlay. In Ontario this meets most condominiums requirements for sound transmission. Also I believe the cork can be glued down and narrower 2" wide eng. boards can be glued onto this. Don't worry about re-finishing, just choose a floor that has aluminum oxide below the uretane wearlayer, and when it gets ratty looking screen the urethane and re-apply more. Mannington make an excellent product, I have seen it produced in North Carolina, and quality is tops.