Pre-Inspection Requirements. It is the responsibility of the installer/homeowner to inspect each plank prior to installation. Our product is guaranteed to be on grade and free of manufacturing defects prior to installation. If you have a given characteristic objectionable, simply have your installer cut it out during the installation process. Arimar flooring is manufactured in accordance with accepted industry standards which permit a grade/manufacturing defect tolerance not to exceed 5% of product or labor when planks containing defects of any kind have been installed. Minor variations in plank thickness do occur and is normal between planks.