Plasterwork backing is a construction technique that involves the use of LATH and lathes. LATH is a thin, narrow strip of wood or metal used to support plasterwork, while lathes are strips of wood or metal that are nailed to the LATH to form a backing for plasterwork. This technique is often used in the construction of walls and ceilings, as it provides a strong and durable surface for the plasterwork to adhere to.