Does AAC Improve BASIX and NatHERS Performance?

Autoclaved Aerated Concrete, commonly known as AAC, is widely used in Australian residential construction as wall panels, blocks and lightweight masonry cladding systems. Its air-filled structure can provide useful thermal resistance while remaining substantially lighter than conventional concrete.

AAC can form part of a well-performing BASIX and NatHERS design, but the material does not automatically produce a higher energy rating. The result depends on the complete wall construction, including the AAC thickness, frame type, insulation, cavities, internal lining, external finish and any thermal bridging through the assembly.