There are wood sub-floors that are very hardwood-friendly. This means the subfloors themselves are flat and smooth. Flat and smooth doesn’t mean that the floor is level. A floor doesn’t have to be perfectly level to look superb covered with hardwood strips. Wood floor systems framed with engineered wood I joists, or those made from floor trusses, often are extremely flat or in the same plane. Both types of joists are a dream because they produce such a flat floor. It can be easy to do.
