Sharing information and promoting earthbag building
Sustainainable Building at Great Determination Buddhist Hermitage
The small city of Athens, Ohio is a hotbed of sustainable building practices. There are nearly two dozen strawbale houses, an earthship and many off the grid dwellings in the vicinity. We did not realize this until after we had moved here. When we decided to stay we spent a year intensively researching alternatives to mainstream building techniques and settled on a plan that fit our very small budget, was simple and low tech, that two reasonably fit persons could build alone. We chose to build an earthbag house. This will be the primary residence for the hermitage staff.
Dhammatara (left) is a sculptor with a life long interest in the shaping living space. Even as a toddler, building homes for toy animals occupied a great deal of her imagination. We needed a living space and a practice center and construction is within our ability if we can do it ourselves. There are hundreds of alternative lifestyle and green building books out there. Maybe even thousands. The major influences on our choice of building technique were Racing Alone by Nader Khalili and Earthbag Building by Kaki Hunter and Donald Kiffmeyer.
Hindsight- After months of design work the dome shape was rejected, in favor of sqaure corners and straight walls to accomodate living spaces inside. In hindsight this was a mistake. Because of our straight walls we had to build buttresses - keyed in, stepped up protrusions from the wall centers that stabilize each wall against lateral motion. That means we filled 25% more bags than no buttresses would have required - extending the time, effort and materials needed for the structure by that much. And the rubble filled trench had to be extended to accomodate them as well. Also corners - which buttresses make many more of - are a pain to account for - you have to shorten or lengthen the bags to fit, slowing down the process. And lastly the dome shape eliminates the roof, which cost as much or more than the rest of the structure combined. So if we had to do it again we would make a dome.
Materials we used - limestone is common in southeast Ohio, often to get at a layer of coal there is a lot of limestone that has to be removed first, this is available in various sizes. A mix of clay and sand is called for but that is not available here, clay is so common no one wants it. Our particular building site is mostly silt, that won't do for building. We wound up getting several truckloads of "number one crusher run" or "roadbase" that is crushed limestone fines (dust) to 3/4 inch in size. This worked out really well, since when watered and compacted the limestone forms a solid mass.
An integral roof is another excellent recommendation for a dome shape, or for building the house into the hillside or ground. I had thought of building a large tripod and using it with block and tackle to lift the beams but instead each was just hoisted on shoulders and muscled into place. It was an uncertain and risky process I don't recommend. The bag walls went up around them and locked them into place. At that point the walls were ten feet or higher and tossing number ten cans of number one crusher run wasn't for us. We had a 22 ft extension ladder that we hooked a pulley to and used that to lift the cans and water efficiently to the bag filler.
A handful of this is patted between the palms to make a patty, this is then slapped into the crevice between the layers of bags and the next is attached to that. The patty formation is important for the fibers to knit together, followed by the slapping and tapping with open fingers forms a cohesive felted surface that cures and dries leaving a visible texture. This stuff can't be troweled, it doesn't like being squeezed or pressed, it likes being patted. The finished result is a soft cardboard like an eggcarton. This will have to be sealed. It's relative fragility and is disturbing until you think that the underlying wall is so strong, compared to stick built houses where the surface boards, though tougher, can still be broken or burned and the underlying wall structure is much more fragile than the earthbags.
We started on the floor with round, washed, Number 57s or 1/2-1 1/2 inch stones quarried nearby by the Cochrans. We ordered the minimum of ten tons and got eleven. Then we spread a level 4 inch thick layer on the floor by wheelbarrow loads. It is fairly easy to shovel and move compared to the roadbase. It's also delightful because of the shapes and holes and colors and fossils among them. We saved out the best for embedding in the surface later. The straw rich adobe layer is going on now. Five gallons soil from near the house site, mixed with 3/4- 4/5 gallon portland cement and approximately three gallons rainwater make a thin slurry. Into this a five inch thick shingle from a bale of wheat straw is massaged until thoroughly coated then flung onto the floor in a 4 inch thick layer. This is shifted around until level. One bale used this way covered about a ten by six foot area and though we forgot to count took about thirteen buckets of dirt and about forty gallons rainwater. The unsealed final layer. The middle layer of straw rich adobe mortar over washed river stone. .
Back wall of bench sculpted of cob
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