Is a moisture barrier needed if the Wood Flooring Is above grade?
Nearly every manufacturer of wood flooring recommends a moisture barrier for below-grade installations. This is to prevent the wood from contacting any water from the concrete slab. Moisture barriers are water-resistant covering boards that help prevent moisture intrusion. If you are going to install your hardwood flooring over an existing finished floor, then you should consider an additional moisture barrier to protect your prefinished hardwood floors.