Casement Window Sashes Even though primarily related to double-hung windows, window sashes can be found on any type of window which moves, including the casement window. Treatment must be taken with casement windows when they're open. A high wind can shift casement window sashes and crack them off. Window film – https://holdeneteoy.jts-blog.com/34965448/fascination-about-sash-window-draught-proofing