Why We’re Building an Earthbag Stemwall

Gravel bag stemwall built by Ziggy, author of Year of Mud blog
Gravel bag stemwall built by Ziggy, author of Year of Mud blog

“The small off-grid home we’re helping friends build here in the Appalachian foothills is getting a bunch of work done to it recently. The biggest task of the moment is building the earthbag stemwall, which we need to finish before our upcoming Straw Bale Workshop in July. We opted for an earthbag stemwall due to the availability of appropriate materials, the relative ease of construction, and the unique siting of the house. All things considered, I think going the earthbag route has been a good choice.

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How to Build a House with a Single Bag of Cement

Cob house on earthbag foundation made with natural and recycled materials
Cob house on earthbag foundation made with natural and recycled materials

“Sukalatti was built using the same amount of energy required to produce 50 bags of cement at the factory. Without the nylon shade net, producing a single bag of cement would consume more energy than the entire house.”

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The Mud Home: Earthbag Foundations

Gravel bag foundations save thousands of dollars, use no concrete and don’t wick water up in the wall.
Gravel bag foundations save thousands of dollars, use no concrete and don’t wick water up in the wall.

“There will be many who refuse to believe this will work. What no concrete? Will be their never-ending refrain.

Concrete foundations have been around for less than a hundred years. Buildings have been built for millennia. In the eastern Mediterranean it’s common to see structures still standing over 2000 years after they were built, without a drop of concrete.

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Earthbag Foundation for Floor System

Three courses of earthbag were used to create a foundation for the floor joists
Three courses of earthbag were used to create a foundation for the floor joists

“In addition to the Durisol stem wall foundation, our project for the teachers’ union office includes two long sections of earthbag foundation to support the floor joist spans inside the building. The inherent insulation value of the Durisol blocks made them our first choice for the exterior of the building, but the extremely low environmental impact of earthbag foundations made them an easy choice for the interior.

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Industrial Earthbag Projects

Industrial earthbag projects include massive projects such as highway retaining walls.
Industrial earthbag projects include massive projects such as highway retaining walls.

Our focus here is on low cost, owner-built homes. From time to time it’s interesting to explore related ideas to see what’s available or going on. As we’ve reported before, there’s a whole industry that specializes in industrial earthbag projects using geotextiles or geosynthetics. Their primary journal is called Geosynthetics Magazine.

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$6/square foot Straw Bale Houses in Pakistan

Twice as energy efficient and half the cost of a conventional house, straw bale makes for environmentally friendly earthquake-proof homes.
Twice as energy efficient and half the cost of a conventional house, straw bale makes for environmentally friendly earthquake-proof homes.

“After the 2005 Kashmir earthquake, Pakistan Straw Bale and Appropriate Building (PAKSBAB) was set up to protect people’s homes against extreme weather conditions. More recently with the catastrophic earthquake in Turkey, I am reminded of the value of homes and family.

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