In the past few months I’ve inspected more flatness concerns that are costing thousands of dollars in corrective work, and what’s sad is that these could have been avoided. The industry and manufacturers have guidelines for floor flatness, and contractors and retailers should be using them to validate the necessity for proper floor prep when these tolerances aren’t met. In order to maintain warranties, flatness requirements must be met.
Guidelines for flatness from the National Wood Flooring Association (NWFA) are: