Solid wood is milled from a single 3/4" thick piece of hardwood. Because of its thickness, a solid hardwood floor can be sanded and refinished over several generations of use. Solid wood flooring expands and contracts with changes in your home's relative humidity. Normally, installers compensate for this movement by leaving an expansion gap between the floor and the wall. Base molding or quarter round is traditionally used to hide the extra space.

Engineered wood is produced with three to five layers of hardwood. Each layer is stacked in a cross-grain configuration and bonded together under heat and pressure. As a result, engineered wood flooring is less likely to be affected by changes in humidity and can be installed at all levels of the home.

Before deciding on Solid or Engineered hardwood flooring, consider these factors:

Location
The location of your hardwood flooring basically falls into three categories:

* On Grade - at ground level

* Above Grade - any second level or higher

* Below Grade - any floor below ground level, including basements or sunken living rooms.