Structural warranty certifies products to be free from defects in milling, drying and grading. Structural lifetime Warranty means that the product will remain free from milling and grading defects for a lifetime if following all necessary recommendations on transportation, storage, installation and care that were outlined in the section “Hardwood flooring care”. Product quality variation that does not exceed 5% is industry standard and is not considered a factory defect. Products sold as waste, seconds or “as is” are not covered by this Warranty.
Due to the fact that the wood is a natural product, hardwood flooring will expand and contract through heating and non-heating seasons. Properly installed hardwood floors may consequently experience some separation between the boards at different times during the year. If such separations do occur, they are not covered by this Warranty. It is important to maintain relative indoor humidity as constant as possible (between 45% and 55% for solid hardwood flooring, and 40-65% for multi-layer engineered flooring). Use a humidifier or dehumidifier, as appropriate. Indoor temperature should range between 18 and 22° C.