Can Cupped Floors Be Sanded

You can sand a cupped floor as long as the cupping is actually permanent. Remember that most structures undergo a moisture cycle with the changing seasons. In the winter when outdoor temperatures are below freezing, buildings tend to dry out and wood flooring will shrink.

Can you sand down cupped hardwood floors?

When one side of the floor is exposed to excessive moisture, that side will expand, causing the whole board to warp away from that side. … DO NOT sand a cupped floor. Sanding a hardwood floor while it is still cupped will result in a problem called “crowning.

Can you sand warped floors?

Repairing Cupped or Crowned Flooring To properly straighten flooring boards that have curled at the edges or bulged in the middle, you need an aggressive sanding technique. Many refinishers fit a drum sander with 20-grit paper and sand the floor diagonally. They then sand parallel to the grain to remove the scratches.