Autoclaved Aerated Concrete (AAC) - This Old House
Some call Autoclaved Aerated Concrete (AAC) a near-perfect building material. Patented in 1924 by a Swedish architect, AAC is made of common ingredients: portland cement, lime, silica sand or fly ash, water and a dash of aluminum powder. The material is acoustically insulating, energy conserving, resistant to fire, decay and termites, and can ...