Check with the flooring manufacturer for recommendations.
How to install solid hardwood floor over wood.
To learn how to do this watch prepping plywood subfloors.
Solid wood floors should not be installed in basements or below grade.
For instance solid hardwood flooring is typically nailed down during installation while tongue and groove engineered flooring is usually clicked together or completely glued down.
Wood floor installation requires a level subfloor and that your hardwood flooring is acclimated to the room s humidity and temperature according to the manufacturer s guidelines.
If your subfloor is already hardwood but you want to improve the look of your home with new material it is possible to lay engineered hardwood over the existing floor with proper preparation and traditional installation techniques.
When installing new wood flooring parallel to an existing solid nail down floor add a minimum of 3 8 plywood underlayment over the existing floor to increase stability.