[unread]

"Autoclaved aerated concrete (AAC), also known as autoclaved cellular concrete (ACC), autoclaved lightweight concrete (ALC), autoclaved concrete, cellular concrete, porous concrete, Aircrete, Hebel Block, and Ytong is a lightweight, precast, Foam concrete building material invented in the mid-1920s that simultaneously provides structure, insulation, and fire-and mold-resistance." Wiki--

In my humble opinion, this is the perfect building matiral.. :)

[Texas Fossil]

I had never heard of it. Must be a fired brick like the clay tile blocks were. They were actually quite good. Not sure they are still made, I’ve never used them.