Solid wood flooring is a solid piece of wood from top to bottom. A solid hardwood flooring quite simply is a flooring made from many numbers of different types of tree or species of tree but is manufactured from one single piece of wood i.e. Solid wood planks are milled from a single piece of timber. Solid wood floors are extremely strong and durable because of the large amounts of wood that sits above the tongue that may be sand many times. Solid wood flooring can be installed above or on grade, and can be sanded and refinished several times during its service life.