noun
rough wall plaster; cob
A traditional Japanese wall-building material made of clay mixed with straw and other fibers, used as a rough undercoat before finer plaster layers. The term is specific to traditional architecture and construction.
See also: 中塗り土
古民家の壁には荒壁土が使われている。
Rough wall plaster is used in the walls of old traditional houses.
荒壁土を塗った後、中塗り土で仕上げる。
After applying the rough undercoat, they finish with a middle coat of plaster.