roughcasting

1.【建】粗作,粗制;粗涂,打底子;打底用灰泥;(拟定)大体方案

1.a surface of coarse plaster covered with pebbles on the outside walls of a building

2.a preliminary form or model of something

1.to cover the surface of a wall or the walls of a building with roughcast

2.to shape or form something in a crude fashion or as a preliminary to more polished work