Many different species of wood are fabricated into wood flooring in two primary forms: plank and parquet. Hardwoods are typically much more durable than softwoods. Reclaimed lumber has a unique appearance and is used in green (environmentally responsible) building. Engineered hardwood has a thin solid wood layer on top with a composite core. It can be a less expensive option than buying hardwood, but it cannot be sanded and refinished. This flooring typically is installed with a click-lock method.