One of the three common types of wood floors. (Others are Engineered and Solid.) Long Strip Plank floors are similar to Engineered floors and have several wood plies that are glued together. The center core is generally a softer wood material and is used to make the tongue and groove. A hardwood finish layer is glued on top of the core. The top layer can be almost any hardwood species and is made up of many smaller individual pieces that are laid in three rows. This gives the effect of installing a board that is 3 rows wide and several planks long. Long Strip floors come in a wide variety of domestic and exotic hardwood species and when damaged they are easy to replace.