Plasterwork backers are typically made of lathes, which are thin strips of wood or metal that are used to support plasterwork. Plasterwork is a type of wall and ceiling decoration that is created by applying a layer of plaster over a lath. The laths provide a strong base for the plaster and help to keep it in place. Lathes are usually nailed or screwed into the wall or ceiling, and then the plaster is applied over them. Plasterwork backers are essential for creating a strong and durable plasterwork finish.