- Data Sheets
- Section 2 - The Physical Environment: Window and Door System U-values: Provision of Certified Data (ref: 2.2)
Section 2 - The Physical Environment: Window and Door System U-values: Provision of Certified Data (ref: 2.2)
Section 2 - The Physical Environment
Window and Door System U-values: Provision of Certified Data
Data Sheet 2.2
This three page datasheet has been prepared by the GGF after consultation with other trade organisations. It describes methods of assessing and reporting the thermal performance of windows and doors. This version supersedes the earlier (March 2002) edition. Changes have been incorporated to relate to the window U-value requirements of Building Regulations Approved Documents for England, Wales, Scotland and Northern Ireland. As these regulations are regularly updated, care should be taken to ensure that the current minimum criteria are met.
The datasheet has two objectives;
1. To enable interested parties to establish whether windows and doors satisfy the U-value requirements of Building Regulations Approved Documents for England, Wales, Scotland and Northern Ireland.
2. To provide a fair means by which comparisons can be made between the performances of different window and door systems.
This Datasheet describes how to provide data on;
• The thermal performance of the component parts of windows and doors, which will enable subsequent calculation of U values of complete window and door assemblies to be
determined by simple arithmetical operations.
• Reference U-values for different types of windows and doors, enabling them to be compared on a fair basis.
The data sheet defines the methods of calculation, simulation and measurement available, and describes the circumstances in which each method is to be used. Curtain walling and other structural glazing are not within the scope of this document. The effects of thermal bridging at the interface with the building envelope, solar radiation and heat transfer by air leakage are excluded.
Published November 2014
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