Autoclaved Aerated Concrete (AAC), also known as Autoclaved Cellular Concrete (ACC) or Autoclaved Lightweight Concrete (ALC), was invented in the mid-1920s by the Swedish architect and inventor Johan Axel Eriksson. It is a lightweight, precast building material that simultaneously provides structure, insulation, and fire and mold resistance. AAC products include Blocks, and Wall panels.
It has been refined into a highly thermally insulating concrete-based material used for both internal and external construction. Besides AAC’s insulating capability, one of its advantages in construction is its quick and easy installation, for the material can be routed, sanded, and cut to size on site using standard carbon steel band-saws, hand saws, and drills.
Even though regular cement mortar can be used, 98% of the buildings erected with AAC materials use thin bed mortar, which comes to deployment in a thickness of ⅛ inch. This varies according to national building codes and creates solid and compact building members. AAC material can be coated with a stucco compound or plaster against the elements. Siding materials such as brick or vinyl siding can also be used to cover the outside of AAC materials.