Description

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 explains the technical background to the types of window construction, frame types and glazing available. It overviews the choices and compromises that need to be made and introduces the New Zealand Building Code clauses and the standards requirements that need to be compiled with.

Scope

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.