One of my regular readers, Architect Joseph Sandy, recently submitted a design to the The $300 House Open Design Challenge. It uses CEBs (compressed earth blocks) for the lower portion of the walls and a light wood frame for the upper walls and roof – leveraging the best of both building methods. The roof would be covered with corrugated metal.
CEBs are made in a press – think giant garlic press without the holds. A earthen mixture is placed in the chamber and then using a giant lever the earth is compressed into a block. Below is a short video that demonstrates how CEBs are made.
There are just a few days left in this design competition… take a closer look at Joseph’s design. If you like his approach, be sure to vote. Thanks!
I wonder how well CEB’s stand up to an earthquake.
Seems like they could liquify http://en.wikipedia.org/wiki/Soil_liquefaction
Google Michael Reynolds Earthship! His solution is to compact dirt into used tyres, creating effective thermal mass. He has incorporated anti-earthquake design into his structures. Very cheap housing and completely self heating and cooling!
There are some methods you can use to strengthen structures and keep the individual blocks from tumbling, but the blocks themselves are unlikely to come apart from just shaking. Compressed soil is not as subject to liquifaction and there is usually a binding material in the blocks as well. The looser the soil the more subject to liquifaction. Some interesting info at http://www.eartharchitecture.org Just enter earthquake in their quicksearch at upper right.
The earthblocks harden into an adobe-like brick. Still not great for earthquake zones!
Love this one! That CEB press is like an aluminum can crusher.
More about the CEB press please. How much to buy or build or both. Thanks.
I published a blog post about CEB presses a short while ago that gives prices (hand operated vs. mechanized) for a brand in Thailand. Star Top presses are about half price of those at Auroville in India (world famous for CEB technology). Look closely at the photo on my blog post and compare to the video shown here and you’ll see a huge difference in quality.
Here’s the link to the blog post about Star Top presses:
http://earthbagbuilding.wordpress.com/2011/04/27/star-top-ceb-presses/
Have you ever investigated any of the earthships? I don’t know how small some of them are – they are also a rammed-earth tech.