For almost 75 years now, a building block has been used in Europe that is made from cement, sand, water, and air. The blocks are then baked in an autoclave. If you have seen large autoclaves in person, they are very impressive. The end result is an AAC building block that is water, fire, and termite resistant.
AAC stands for: Autoclaved Aerated Concrete and they are now being used here in the United States.
Additional advantages are that AAC blocks don't weigh much because they are about 70% air and that means these blocks will float. Standard concrete blocks weigh about 50 pounds and are very difficult to shape or cut. AAC blocks can be cut with hand tools and space can easily be shaped for electrical wiring or plumbing. Unused AAC material can then be recycled and that is another bonus.
Updated Blog Post - Article on EnergyHotwire.com to GoingTrueGreen.com Blog
Bill Lauto, at GoingTrueGreen.com
International Sustainability and Energy Consultant
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