These original leaded glass double casement historic arch top window sash needed restoration, and new structural storm sash. Structural storm sash is designed to keep the shape of the original sash mortice and tenon joinery from sagging over time. Westbrooks wood shop is set up for making new arch top storm sash with mortice and tenon joinery. This project also included restoration to the original window sash, but I wanted to focus the portfolio post on the making of new fir storm sash and its joinery. This application will definitely help make these often more difficult casement sash operate and last for a very long time! Storm sash are well worth doing to preserve historic windows and keeping the historic look your historic home, adding to antique historic value. Feel free to contact me if you are looking for any historical architectural sash restoration. Im sure you will be happy with my quality and personalized service!