Yes, I was kind of thinking that. Not sure if aircrete would make sense as an insulating layer either. 6 inches of ridged foam is recommended and would probably be a lot cheaper but I'm not sure. I love the idea of aircrete for interior walls and south facing exterior walls. Aircrete would also offer good insulation for atrium walls open to the outside.
Posts made by CaiRocke
RE: Building underground with aircrete
Building underground with aircrete
Is anyone building underground houses with aircrete, domed or otherwise? The insulative value seems like a good pairing to avoid condensation although, for passive solar, I think it should be behind a wall with more thermal mass which, I assume, the air in aircrete negates. Maybe with a standard concrete slab and aircrete walls a nice balance could be had. Any thoughts about these kinds of considerations or more basic things like aircrete strength and lateral support would be appreciated.