Certass Thermal Rating Register

Glass Services Ltd is a member of the Certass Thermal Rating Register Product Certification Scheme.

The Thermal Rating Register is a product certification scheme certifying the thermal performance of window and door products.

The Thermal Rating Register provides a U-Value calculation tool.  Calculations are carried out as laid down in the Building Regulations in accordance with BS EN ISO:10077-1, using methods and conventions set out in Building Regulation 443.  The calculation is carried out using a standard window as set out in Regulation 443.