Autoclaved Aerated Concrete (AAC) is a masonry product with a long history in much of the industrialized world, yet it has seen relatively limited use in the United States. The two presenters, Dan Levy and Steve Bluestone, both find AAC preferable to wood as a building material for many reasons, including resistance to fire, water, mold pests, and structural loads. And AAC does all of the above with a single material installed by a single trade. Steve’s own home that was completed in 2015 was the first AAC building certified by PHIUS in the USA. Dan’s AAC home may very well be certified also by the time the conference takes place. They will show their projects, discuss successes and trials, and answer questions about AAC and PH.