Engineered Wood Flooring
Engineered wood flooring looks very much like solid hardwood, but its construction features a relatively thin layer of hardwood bonded over a premium-quality plywood layer that gives the flooring very good stability. A good-quality engineered wood floor typically lasts 25 to 30 years, and it is both less expensive and easier for DIYers to install.
The top layer is what you see and is represented by the species of hardwood flooring, like Oak, Maple, Walnut etc. The middle and back layers comprise various species of wood chosen for dimensional stability, so that the entire sandwich becomes stable and more resistant to moisture, humidity or arid conditions. There are typically 5-7 plys in engineered hardwood floors, but can be as low as 3 or greater than 10.