Crowning occurs when the center of the pieces of flooring appears to be higher than the edges.


  • Although it is possible that excess moisture could be the culprit, it is usually caused by a floor that was previously cupped and was sanded before the moisture content had a chance to return to normal levels. Sanding too quickly removed the raised edges. When the boards eventually dried, their edges were actually lower than the center.
  • Excessive drying from underneath can create a moisture imbalance that results in crowning.


  • First, ascertain if the moisture content in the subfloor and floor has stabilized and returned to normal levels. Also, establish if all of the crowning from the original cupped condition has occurred. After the floor has stabilized, resand, and refinish.