We recently featured a home with "aerated concrete" blocks, that you might want to glance at before we get into the block technology. A common brand in aerated concrete blocks is E-Crete, makers of structural concrete block with high insulating and sound dampening performance. Not so aerated as to become excessively large, these blocks are highly flame resistant, and perform well in load bearing walls. That means it may not be necessary to add a foam or fiberglass inner covering to achieve peak energy savings. According to the spec sheets, an exernal vapor barrier also is not needed, which means skipping the VOC coat or barrier sheet. Less stuff all around.
Environmental Peformance Summary
"The energy consumed in the production process is only a fraction compared to the production of other materials.The manufacturing process emits no pollutants and creates no by-products or toxic waste products.
E-Crete is manufactured from common and abundant natural raw materials. The finished product is twice the volume of the raw materials used, making it extremely resource-efficient and environmentally friendly".
Thinking of a New Orleans or Mississippi rebuild with traditional facade details? Apparently this stuff can be successfully carved. If anyone has tried that we'd love to hear about it.