A casement is a window that is attached to its frame by one or more hinges. Casement windows are hinged at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay. Windows hinged at the top are referred to as awning windows, and ones hinged at the bottom are called hoppers.
Advantages of casement windows are:
- Variety of design features. Casement windows offer a number of attractive design features such as French, flat top, pushout, top down grille, colonial grill, prairie grill, and no grill. They can be customised for precise size and desired colour, and they look attractive in a number materials. Typical casement window materials include wood, aluminium or uPVC.
- Second most efficient window. Casement windows are the second most energy-efficient, after fixed-pane windows. The window sash presses against the frame on closing, creating an airtight seal. This helps prevent air entry and leakage.
- Easy to open and close. Because they use single-lever latches or tandem latches, casement windows are easy to open and close. Most models can also be fitted for automatic openers.
- Excellent ventilation. Casement windows open all the way outward. Unlike double-hung windows, which are closed on top, casement windows are wide open from top to bottom and side-to-side providing excellent natural ventilation and light.
Disadvantages of casement windows are:
- Size limitations. Casement windows are designed to open outward. Because of the design, the windows can’t be too large or too heavy. The opening has to be strong enough to support the window, so we would recommend smaller and more lightly constructed windows.