Lath an plaster is a building process used mainly for interior walls in the United States until the late 1950s. After the 1950s, drywall began to replace the lath and plaster process in the US. In the United Kingdom, lath and plaster was used for some interior partition walls, but was mostly used in the construction of ceilings. In the UK, plasterboard became a more common ceiling construction from 1945 onwards.