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​​​​​​​Dating back centuries, perhaps millennia, the rubble trench is an ancient foundation style popularized by architect Frank Lloyd Wright. The rubble trench is a type of foundation that uses loose stone or rubble to minimize or eliminate the use of concrete and improve drainage. It is much more environmentally friendly than portland cement that requires the use of enormous amounts of energy.. 

The rubble trench is also believed to withstand seismic activity (earthquakes).

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Geo-Thermal Solar 

Air Conditioning

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Rubble Trench Foundation


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​​​​​​​Yes. Air conditioning powered by a 12 volt dc fan that uses only .34 amps, powered by energy from the sun. The Geo-Thermal part is 200 feet of 4" NON insulated pipe run horizontally under the frost line. Your local extension office can provide the information on the mean temperature (cave temperature) of your area, which is the same as the temperature below the front line. For us it is 56 degrees; cool enough ground to reduce the temperature of the air flowing through the cooling tubes and flowing in the room.

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Natural Rock Stem Wall


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​​​​​​A cob structure is heavy, like 100 lbs. per cubic foot heavy. With each wall's weight measuring in tons, the building will sink into the ground without a good foundation. Natural rock is an excellent compliment for cob walls. It is much more environmentally friendly than cement cinder blocks, that require the use of enormous amounts of energy. We encourage the use of lime mortars and plaster when building with cob as well. Due to the alkaline nature of lime it inhibits mold, frequently a problem with masonry.​​