A concealed plaster is the lower layer of a multi-layer exterior or interior plaster, which is applied as a separate work step before the top plaster. Under certain conditions, a reinforcing plaster with a full-surface fabric insert is required between the top and bottom plaster. There are different types of plaster (normal plaster, light plaster, insulating plaster, renovation plaster), but they all consist of mineral raw materials.
Source: bauwion
