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Last edited 10 Apr 2018
Types of window
There are a number of ways of classifying window types:
- Annealed glass.
- Fire-resistant glass.
- Float glass.
- Fully tempered glass.
- Glass brick.
- Heat soaked tempered glass.
- Heat strengthened glass.
- Insulated glazing units.
- Laminated glass.
- Low-emissivity glass (Low-E glass).
- Self-cleaning glass.
- Stained glass.
- Toughened glass.
- Wired glass.
 Cavity fill
 Overall design
- Bay: Multi-panel windows that project in front of the external wall line, supported by a sill height wall.
- Bow: A curved bay window.
- Clerestory: Bands of windows across the tops of buildings that allow natural light in without compromising privacy or security.
- Curtain wall: A non-structural cladding systems generally associated with large, multi-storey buildings.
- Display window: Intended for the display of products or services on sale within a building.
- Dormer: A small roofed structure that projects outwards from the main pitched roof of a building.
- Glass mullion system: Sheets of tempered glass held in position by clamps and joined by a structural silicone sealant or by metal patch plates
- Multi-lite: Windows glazed with small panes of glass separated by glazing bars, or muntins.
- Patent glazing: A non-load bearing, two-edge support cladding system.
- Picture window: A large fixed window that lets in the maximum amount of light and provides external views.
- Roof window: A window that is in the same plane as the surrounding roof, and has a minimum pitch of 15 degrees.
- Rooflight / skylight: A dome light, lantern light, skylight, ridge light of glazed barrel vault installed on an upstand, so it is not in the same plane as the surrounding roof.
- Sidelight: Positioned beside a door or main window.
- Toplight: These are usually above doors.
- Transom window: A horizontal window that is commonly mounted above a door or another window to let in more light.
 Method of opening
- Awning: Hinged at the top and opened outwards.
- Bi-fold: Made up of a number of individual sashes, usually 2, 3 or 4, hinged together.
- Casement: An opening window fixed to the frame by hinges along one of its edges.
- Fixed light: A window that is fixed in place and cannot be opened.
- Louvre: A series of parallel pieces of glazing that are hung on central pivots.
- Pivot: Hung on one hinge at centre points on each of two opposite sides allowing the window to revolve when opened.
- Sidehung: A variation on a casement window, side opening controlled by tracks and slides.
- Tilt and slide: Tilts inwards at the top and slides horizontally behind the fixed pane.
- Tilt and turn: Include a mechanism that allows them to tilt inwards from one edge or to open inwards from one side.
- Topguided: Tracks and slides enable the top to slide downwards whist the bottom opens out.
- Vertical slider / sash: Glass is fitted in ‘sashes’ (moveable panels) that slide vertically past each other.
The Window Energy Ratings (WER) is a scale developed by the British Fenestration Ratings Council (BFRC) to measure the thermal performance of windows. The BFRC label indicates the rating of the window on a scale running from A+ (the most energy efficient) to G (the least efficient).
See: Architectural styles.
 Find out more
 Related articles on Designing Buildings Wiki.
- Architectural styles.
- Bay window.
- Domestic windows.
- Double glazing.
- Easily accessible window.
- Glass manifestation.
- Light well.
- Security glazing.
- Stained glass.
- Types of blinds.
- Types of door.
- Window and door schedules.
- Window Energy Rating.
- Window parts.
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