Petra Stone NWA manufacturer warrants Petra Stone Veneer products for a period of 25 years against manufacturing defects when used on structures that; conform to local building codes, and when installed in accordance with manufacturer's written instructions. Warranty coverage is limited to the original purchaser. Warranty coverage excludes damage resulting from wall movement, settlement of the building, contact with chemicals or paint, and discoloration due to contaminates, staining or oxidation. Warranty coverage is limited to replacement of defective materials only and does not cover labor to remove or replace materials.