filmsashes

A filmsash is a decorative, often removable, fabric panel that is attached to the exterior of a window sash. Typically made of canvas, vinyl, or other weather-resistant materials, filmsashes serve a variety of purposes. Historically, they were used to provide insulation against cold drafts during winter months, with the fabric acting as an additional barrier to the outside air. In warmer climates or seasons, filmsashes could also be used to filter sunlight, reducing glare and heat gain within a room.

The design of filmsashes can vary greatly. Some are simple, unadorned rectangles that fit snugly within the window frame. Others might feature decorative elements like stitching, embroidery, or even appliqué, adding an aesthetic touch to the building's facade. The attachment methods also differ, ranging from simple ties or snaps to more elaborate systems involving channels or clips. While less common today due to advancements in window technology like double-paned glass and storm windows, filmsashes are still employed in some historical restorations or for specific stylistic choices. They represent an older, more traditional approach to managing interior comfort and light control in buildings.