Autoclaved Aerated Concrete Blocks
For every square inch of block you get an hour of protection from flames. These amazing building blocks made of aluminum and concrete are half the weight of traditional concrete blocks, have higher insulating qualities, and can be cut with a handsaw, which means your fire-resistant home can go up blazing fast. $2.71 per square foot. Aercon,
Haines City, FL; 800-830-3171.