As the name implies, solid wood floors are manufactured/milled from one complete piece of solid wood, generally ¾” thick with the width of the board generally 2 ¼” and 3 ¼” wide. Solid wood floors react to the environment in which it is placed. In the winter and summer months, hardwood floors will expand and contract with the temperatures of the season. Solid wood floors are sensitive to moisture and it is not recommended to install these floors below ground level, or directly over a concrete slab. You can refinish, or recoat solid wood floors several times, which adds to their appeal and to their long life. There are solid wood floors that are several centuries old and are still in good condition today.