Premier A Grade Insulation Limited is proud to offer a 50-year warranty from date of installation on all its Premier A Grade Glasswool insulation. When installed and maintained correctly, as outlined in NZS 4246 and our technical instructions, we warrant the materials free of defects for 50 years. The products meet the specifications of the BRANZ appraisal No. 509 (2014). The warranties set out in our terms and conditions are in addition to any rights that may exist under the Consumer Guarantees Act 1993.