👉 Casements are a type of sliding door that is typically made from wood or metal and has two doors, one for opening and one for closing. They are commonly used in buildings as a means to provide security and privacy while allowing easy access between the living areas and outside spaces. Casements have been in use for centuries and were originally designed for military purposes where they could be opened and closed quickly to allow quick movement of troops or equipment into and out of the building. Over time, casement doors