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How to Build Large Earthbag Domes — 11 Comments

  1. I live in Tn and am having a difficult time finding an engineer that will sign off on my building diagrams. Any idea how to get a building permit if Noone will work with you.

    • It sounds like you are picturing a vault rather than a dome, and it is possible to make vaults in sections that are linked together. But the size limitations on earthbag vaults are very confined; I recommend no larger than about 8 ft. across as the base, and even with this it may need to be buttressed.

  2. how about max size (diameter & height) for roundhouse something like cylinder

    how do we make partition inside earthbag house? use the bag it self or some kind of wood? plywood, osb etc

    • Maximum size of roundhouses without lots of extra reinforcement: 30′ diameter

      You can build any type of interior walls you want. I like stud walls because it makes running electrical and plumbing easy. Use recycled wood or wood from dead trees harvested in the forest.

        • 3m ceilings are the norm in the tropics. Do not go higher than necessary. Instead, make sloped ceilings that direct hot air out roof vents.

          • Dr, I’m thinking about round house with flat slightly slanted metal roof .. so should i make it higher than 3m?

            can i put bags with rice hull as insulated ceilings? just rice hull or mix with soil?

          • 3m is standard in the tropics. No reason to go higher. Just add vents along the top of walls and one or more ceiling fans.

            Rice hulls can work but be careful because in the tropics they may become rat nests. I’ve been told it’s nearly impossible to keep rats out of attics and similar cavities in the tropics. They chew through cement board, etc. because they can sense the cavity (potential nesting area) on the other side.

  3. Ferrocement, post & beam, or truss roofs will be easier than a large earthbag dome over Owen’s recommended safe size limits.
    I started building a 24′ interior dome, just a single dome so that I may meet my minimum square footage required and be able to handle the project with no budget other than bags/rock and a late August start in the mountains. After some 80mph gusts moved my big arch forms, I dismantled my 10 rows and pushed it out to almost 25′ interior diameter to meet my forms new position.
    Using Scoria bags that don’t achieve that solid compaction of a good rammed earth soil, there was a tendency of lower rows to roll/bulge while I tamped above. Thats the nature of big eb domes. That’s hassle, not building a roof (if you can afford it). Rebar pinning, temp bracing with bottle jacking, repositioning sections of row a Eb until it’s right. I won’t do another 20+ again. Interior walls, lofts, and built in shelving could all help buttress when needed in domework. Though once it’s bagged up to the top, especially with rebar pins, it’s super solid. But getting there in a big dome is a hassle.
    Might wanna consider 100lb bags if you are set on pushing the limits.

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