Lifetime warranty for residential use, 5 year warranty for commercial. The warranty is effective starting on the date of purchase. At its option, the company will repair or replace the product without charge, providing our inspection indicates that an original defect exists. Should the company choose to replace the product, and the product is no longer available at the time warranty service is required, a substitution of similar performance and equal or greater value will be made. The poly material used has UV stabilizers compounded into it, making it resistant, but not impervious, to fading. Change in color or staining caused by sunlight or other foreign substances is not covered under this warranty. Some expansion and contraction is to be expected during changes in humidity and temperature. You must explain the nature of the original defect and include your name, address and telephone number.