This is simply raw, unfinished wood of any type that is milled into tongue and groove form. In most cases, this is solid wood, but can also come in engineered varieties. Finished on site hardwood is exactly that, “finished on site”. The wood is installed raw and sanded on site. Then, it is finished with up to three coats with many options. These types of floors require more upkeep, with refinishing every 5-10 years depending on the amount of wear. The time between refinishes can be extended by getting the floors screened and coated. Finishing options primarily include oil-based polyurethane, water-based finishes.