Hardwood flooring is any flooring product made of real wood sawn from timber and manufactured for use as a floor. Hardwood is available in a wide variety of different tree species and can be manufactured as solid hardwood (the planks consist of one solid piece of wood sawn from a single timber) or as engineered hardwood (a planks are made from multiple layers of wood adhered together). Hardwood flooring can come in planks, strips, parquet patterns and other shapes. Generally hardwood products come prefinished from the factory with stain and a wear layer to protect it, but in some cases the wood is installed without a factory finish and the finish is applied onsite. Some hardwood floors can be sanded or screened and refinished overtime to return a more pristine look and feel, however this process can be expensive, time consuming and messing. As a result the practice of sanding/screening and refinishing is becoming less common as consumers more often opt to replace older and worn out hardwood floors with entirely new ones.
Hardwood floors typically feature a tongue and groove construction so that the planks lock together. Hardwood floors are often nailed or stapled into the subfloor for installation. In some cases engineered wood may be glued to the subfloor. Before installing any hardwood floor a moisture test must be done to ensure the moisture rising from the subfloor does not warp or damage the floor after installation.