Level: Windows (2nd edition)

Windows and glazed doors play a vital role in sustainable building. They can account for more heat gain or loss than any other element in an insulated building envelope. A well designed glazing system can improve internal daylight levels, reduce glare and help maintain thermal comfort by reducing heat gain and loss. This contributes to energy efficiency by reducing the need for artificial heating, cooling or lighting.

This guide covers: 

• building controls
• functions of windows
• performance of windows
• aluminium, uPVC, steel, timber and fibreglass windows
• classification of opening windows
• glazing
• insulating glass units (IGUs)
• fittings and accessories
• building construction.

This guide does not cover overhead glazing, roof windows, skylights or commercial facades or window sections.

The thermal performance requirements of building elements given in this book are from the 4th edition Building Code acceptable solution H1/AS1 and verification method H1/VM1. Note that 5th editions of H1/AS1 and H1/VM1 replace the 4th edition from 3 November 2022.