ABSTRACT
A window must be aesthetically acceptable in the context of building design and the surrounding environment. Windows should be selected or designed to resist wind loadings, be easy to clean and provide for safety and security. They should be sited to provide visual contact with the outside. Extruded aluminium profiled sections are designed and manufactured to create lightweight, hollow window framing members. Poor insulation and high conductivity are characteristics of solid profile metal windows. Horizontally sliding sash windows can be constructed in timber, metal, plastic or combinations of these materials with single or double glazing. The main function of a schedule is to collect together all the necessary information for a particular group of components, such as windows, doors and drainage inspection chambers. Window manufacturers identify their products with a notation that combines figures with numbers. Double glazing is used instead of single glazing to reduce the rate of heat loss through windows and glazed doors.
