How To Fix Hardwood Floor Cupping. Ensure that no water is standing in the basement or crawl space under your house. The moisture content of the solid wood floor must be at equilibrium with the expected in-use normal living conditions prior to resanding a cupped floor.
Fix any leaks and drainage issues that are causing it. Humidity buildup under a house is one of the main reason for a wood floors cupping and buckling. This can be done by acclimatizing the home to in-use conditions before and during the flooring installation and by making sure moisture barriers such as Aquabar underlay are in place.
Set a small piece of paper onto an equally small drop of water and you see the same concave shape.
The moisture content of the solid wood floor must be at equilibrium with the expected in-use normal living conditions prior to resanding a cupped floor. Use a ruler or straight. Dry vacuum the affected part until dry you may speed up the process with an electric fan. The NWFA lists the following remedies for cupped floors.
