Block work is something of a necessity in a building. Almost all buildings will feature concrete blocks in one way or another. According to the Concrete Block Association 60 million square metres of dense and lightweight concrete building blocks are produced each year.
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English “plaster” usually means a material used for the interiors of buildings, while “render” commonly refers to external applications.