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Casement Windows
Casement windows are projected windows that open such that the vertical sides of the sash remain parallel to the frame while the horizontal sides angle to the frame is increased to as much as 90 degrees when fully opened. Most casement windows open so as to project to then outside of the structure.
Because it consists of a single sash a casement window lets in more light light and ventilation than a multiple sash window such as a double hung or slider. The amount of air coming in through the window is adjusted by the angle the sash is opened. This design choice will allow the complete window area to be open.
Casement style windows are used either individually or in combination. This allows for considerable design flexibilty.
In cold weather, drafts are also better prevented with the casement style window as it depends upon a compression gasket to seal against air and water infiltration. The greater the positive (wind) pressure on the sash, the tighter it seals against the frame.
Security is good these windows as they usually have multiple locking points. Screens are mounted on the inside of the frame and stay relatively clean. Some casement windows offer washability hinges that allow the sash to move far enough away from the frame to permit a person to reach the outside surface of the window from the inside.
