There are Two Types of wood floors available on the market today.
Solid Wood Flooring is exactly what the name implies: a solid piece of wood from top to bottom. The thickness of solid wood flooring can vary, but generally ranges from ¾” to 5/16″. One of the many benefits of solid wood flooring is that it can be sanded and refinished many times. Solid wood flooring can be installed above or on grade.
Engineered Wood Floors are real wood floors that are manufactured using three to nine layers of different wood-veneers. The sub layers can be of the same species, or of different species. The grain of each layer runs in different directions, which makes it very stable. This means that the wood will expand and contract less than solid wood flooring during fluctuations in humidity and temperature. The top layer of engineered wood flooring consists of high-quality wood. While this type of flooring can be sanded and finished, it cannot be done as many times as solid wood flooring. Engineered wood flooring can be installed above, on or below grade