A casement is a window that is attached to its frame by one or more hinges 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. Aluminum is a popular choice due to its durability, low maintenance requirements, excellent thermal performance, high security ratings and low cost. It offers design flexibility, and the frames can be finished to match any decor.
