I am interested in buying a property with this type of flooring on the entire first floor. This house is located in the Sandia Mtns. near Albuquerque, NM. The house is 20 yrs. old. There are some noticeable sink spots, so I am concerned about what is underneath. What do I need to do to ensure the integrity of this floor? Also, what kind of maintenance/upgrades do I need to expect in the future?