Lumber Liquidators logo
Flooring 101 Home Floor Care and Repairs Problems Cupping, Cracking and Gapping

Cupping, Cracking and Gapping



My floor is cupping, gapping, cracking and I need it replaced.  Please help!

According to the National Wood Flooring Association (NWFA) technical publication C200, "Problems, Causes, and Cures of Hardwood Floors", page 7, cupping occurs across the width of individual pieces of flooring. The edges are high and the center is lowered.  This happens when there is either an excess of moisture on the underside of the flooring or when the surface of the wood experiences rapid drying.  More subtle cupping can occur when the flooring is not acclimated properly.  Excessive moisture can come from a variety of sources including but not limited to concrete subfloor that has not been properly cured, leaking pipes, wet or damp basements, HVAC system not operating, improperly controlled temperature or humidity, etc. Cupping can also occur when conditions result in the surface of the wood dries quickly.  In this situation, gaps and/or cracks may result.

   Because cupping is a localized site issue, Lumber Liquidators does not order inspections.  Customers may order an inspection at their own expense.   If this option is taken, the inspection must be done by a certified NWFA inspection company to insure that the information is complete, accurate, and in line with industry accepted standards.  

   If an inspection is completed and the results show that there is a manufacturing-related issue; please forward the report to Lumber Liquidators for review and consideration based on the warranty guidelines.  Product warranties are located on the individual product pages to the left of the room picture.  Located in "Flooring 101" at the bottom of our webpage is a moisture reduction strategy that can assist you in correcting the problem.

Technical and Installation 04/2019


Flooring 101 Home Floor Care and Repairs Problems Cupping, Cracking and Gapping