Engineered wood flooring ® is the easiest hardwood flooring to install. Generally these wood floors can be laid over an underlay without attachment to the sub-floor. They have a top layer veneer of solid hardwood pressure glued to plywood base layer. The top layer can sometimes be refinished or sanded down when necessary and gives the appearance and feel of real solid wood floors. The plywood or hdf base adds increased dimensional stability to the planks. Produced in Germany, Europe and Asia.