You have to think of a hardwood floor as a living entity. It will react to changes in climate, especially humidity. This is especially true with a solid hardwood floor. In Colorado I strongly recommend having a whole house humidifier for any hardwood floor, but it is especailly important for solid.

A solid hardwood floor should be 3/4" thick. If so it can be resanded 3-4 times over a life time. A solid floor should only be installed above grade over a wood subfloor.

I do sell prefinished hardwood floors and if you want you can call me for advice at seven one nine 2 2 nine forty five thirty five.