Engineered wood floors are made up of a real hardwood layer on top with a wood composite underneath. This composite is made up of several layers that are positioned in different directions that add to the durability of the floor.
For every square foot of 3/4 " thick solid wood flooring manufactured, you can manufacture 4 times the amount into engineered wood flooring. It is manufactured from fast-growing underutilized, and less expensive wood species.
Because of the construction, engineered hardwood will not warp or swell as much as solid hardwood.
As long as the top layer of your flooring is 3mm or more, you can refinish your engineered hardwood floors.
Because a real layer of wood is used on top it is hard to tell the difference between solid and engineered wood once it is installed.