Keystone’s third party inspection and certification programs enable building envelope product manufacturers to demonstrate compliance with the requirements of building codes, the Energy Star Windows Program and other utility / tax rebate programs.

Keystone’s NFRC Certification Program is licensed by the National Fenestration Rating Council (NFRC) and offers fenestration (window and door) manufacturers a third party verified, nationally-recognized method for demonstrating product U Factor, Solar Heat Gain and other thermal performance characteristics.

The Keystone Structural Performance Certification Program is accredited by the American National Standards Institute (ANSI), and offers fenestration product manufacturers a third party verified, nationally-recognized method for demonstrating product design pressure performance.

The Keystone Impact Performance Certification Program is accredited by ANSI, and offers fenestration productmanufacturers a third party verified, nationally-recognized method for demonstrating product resistance to flying debris resulting from hurricanes.

The Keystone Quality Assurance Program is accredited by the International Accreditation Service (IAS), is officially recognized by the Florida State Building Commission for demonstrating compliance with the third-party quality assurance requirements of the Florida State Product Approval Rule 9B-72.

Keystone's Insulating Glass Certification Program is an ANSI-accredited third party quality assurance program specific to the insulating glass (IG) fabrication aspect of the fenestration product. The implementation of IG program requirements will lead to improved seal durability and longevity of IG units.