Instructables

Note: If you’re new to earthbag building, first read the introductory Step-by-Step Earthbag Building Instructable and How to Build an Earthbag Roundhouse . Also, my new Earthbag Building Guide and Earthbag Building DVD are now available.

We built this earthbag dome at our home in Thailand for Mother Earth News Magazine in 2007. The article that describes the complete building process in detail was published August/September 2009. It is now free on the Internet: Low-Cost Multipurpose Minibuilding Made With Earthbags , by Owen Geiger.

This earthbag dome Instructable simplifies the process and illustrates each step of construction with photos. The two critical drawings are also included here. Please refer to the complete article before asking questions.

This multi-purpose dome can serve as a storage shed or cool pantry above ground, or as a rootcellar or storm shelter below ground. No building permit is typically needed, because it is below the minimum size required by building codes, is not inhabited and is not attached to a residence.

Earthbag structures provide a cool space in summer and an escape from the cold in winter (ideal for humans and animals), which means this earthbag dome is well suited for many purposes, like a quiet space for relaxing or playing music, as well as those listed previously. Depending on your needs, the most practical combination of uses might be a rootcellar/cool pantry for daily use and a disaster shelter for emergencies such as tornadoes or hurricanes.

The key concept that makes earthbag domes work is corbelling. This means each course (each row) of bags is inset slightly from the course below. Corbelled domes made of adobe and stone have been built for thousands of years. The concept has been applied to earthbags in the last few decades.

Basic project information:
18’ exterior diameter; 8’ interior diameter; 11’ exterior diameter, 50 sq. ft. interior floor space; total cost of materials: $300, which is about $6/square foot.

Tools:
Tamper(s), round nose shovel(s), grape hoe or grub hoe (digging tool), 13” x 16” sheetmetal slider, knife, hammer, 2’ level, 2” x 4” x 10’ leveling board, tape measure, fencing pliers, handsaw, trowel, garden hose with spray nozzle, 6’ or 8’ stepladder

The following instructions assume you have cleared and leveled the site, removed topsoil, positioned fill soil around the building site to minimize work, dug a trench to stable subsoil, put about 12” of gravel in the trench, and added two stakes with string lines: a center stake with string line to measure the radius, and a stake in front of the door to measure the dome curvature. Bags or tubes can be used. We demonstrate bags, because they’re often available recycled for very low cost. My YouTube Channel has a short video showing how the dome was built.

 
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tundrawolf2 months ago

Can we see the inside? How does it stack after a few years for keeping the inside free of insects that burrow through soil?

Owen Geiger (author)  tundrawolf2 months ago

Like I've said several times, it's tiny inside and hard to photograph. You can find similar photos on the Internet of other earthbag domes. (Really cool looking.)

No insects can tunnel through all that soil and through multiple layers of plastic sheeting. BUT some plant roots (vetiver grass?) managed to puncture a hole in one place. We peeled back the sod, added some more plastic sheeting and put the sod back. Total repair time = 5 minutes. No damage to the earthbags because I caught it quickly. Use a more durable roof for homes: rubber bituthene instead of plastic sheeting.

Extremely cool.

I may never build a house like this, but I'm glad to know you did.

I'll bet it's also cool inside when it's hot outside.

Thanks for the Instructable.

Owen Geiger (author)  Ricardo Furioso3 months ago

Yes, it's always cool inside -- the same temperature as the earth. The door is facing away from the afternoon sun so it never gets hot inside.

How hard would it have been to include windows?
How would you do that?
And yes, we'd like to see photos of the inside of THIS structure.
Thank you again?

Owen Geiger (author)  Ricardo Furioso3 months ago

Most domes have windows. This however is just a tiny tool shed. Search the Internet for images of earthbag domes. Most have arched windows. There are various ways of making windows. I like to include ferrocement 'eyebrows' over windows to block sun and moisture.

Owen.
That is one hell of a lot of work for "a tiny tool shed." Actually, kind of insane. But the Hobbitliness of it is amazing, the beauty of it is endearing, and your raw determination to do something wonderful is inspiring.
Thank you from all of us out here in "2x4 studs on 16-inch centers" land. Keep doing what you're doing and keep us posted every step of the way. Like I said above, I may never build like this, but it is wonderful to know that you are doing so with enthusiasm and success.
Please, please, send us updates and Instructables on a regular basis. This is among my very favorite all-time Instructables.
And I know that I am not alone.
Best, Rich

Owen Geiger (author)  Ricardo Furioso3 months ago

For those interested in ongoing projects, please follow our Natural Building Blog. http://www.naturalbuildingblog.com/

We have over 2,000 blog posts on every topic you can think of, and it's all free.

lsuydam1 year ago
I LOVE this. What do you think is the largest dome you could build this way?
Owen Geiger (author)  lsuydam3 months ago

Somewhere around 20' interior diameter is about the limit. That would be 23' exterior diameter.

Owen Geiger (author)  lsuydam3 months ago

Somewhere around 20' interior diameter is about the limit. That would be 23' exterior diameter.

Thank you Owen for all your wonderful information!
You have inspired my son and I to build a semi subterranean earthbag dome.
We have been hard at it for 2 months now and are finally getting close to the top.
It has been a learning experience to say the least!
Wanted to ask your opinion about waterproofing material.
Our plan is to have a living roof when we are done.
I am looking at the different materials available and it is all kinda confusing.
You suggested using 6 mil sheeting. Could we use recycled 5 mil tarps as we have no budget. Also what do you think of a light weight roof underlayment?
The material is a little pricier but would it offer any better protection from leaks?
We want it to last forever. Thank in advance!

http://www.lowes.com/pd_283849-711-5008030_0__?productId=3151833&Ntt=roofing+underlayment&pl=1&currentURL=%3FNtt%3Droofing%2Bunderlayment&facetInfo=

Owen Geiger (author)  gratefulnathan3 months ago

Last forever, ha! Tarps should last for quite a while. Eventually though insects, rodents and roots will puncture through.

The most durable roofing for this purpose is rubber bituthene, but it's super expensive.

Gabeuse8 months ago

My dreamhouse! I wonder how it could resist in a northem climate

Owen Geiger (author)  Gabeuse3 months ago

Add waterproof insulation on the exterior for cold climates. Search for my article and blog posts about Insulated Earthbag Houses.

urtlesquirt2 years ago
Build a life size model of Bag End. Challenge Accepted.
plood urtlesquirt6 months ago

on a related note, would giving this a circular door have any effect on stability?

Owen Geiger (author)  plood3 months ago

Sure, you could do that.

No, no, no! Build a life-size model of Hobbiton, wait, no, The Shire!
Wait a second, is this why Bag End is called Bag End?
"The name comes from the farmhouse in the tiny Worcestershire village of Dormston, in which Tolkien's aunt lived. It can also be seen as a pun on "cul-de-sac" (literally, "bottom of the bag")." - LotR wiki.

More to the point, it's also a slight pun on "Baggins", since if you say "Bag End" quickly as one word, it sounds not entirely unlike "Baggins".
Oh, I know it's Bag(gins) End - I was just fooling around.
Precisely!
Of course. Owen Geiger's real name is J.R.R. Tolkein.
amekdala6 months ago

i wonder about the inside how does it look?

is there any possibility to take a picture of it

Owen Geiger (author)  amekdala3 months ago

It's really tiny and hard to photograph the inside. Search earthbag dome images on the Internet and you'll see lots of similar photos of larger domes.

emtsevilla5 months ago

i look at this instructable every 6 months since it came out just because it's so boss.

Owen Geiger (author)  emtsevilla3 months ago

Whoa, thanks.

excellent...no words for it.

ttimelady3 months ago

Could you live in this???

NeoNeodym5 months ago

I'm going to build a play house for my daughter using this. It WILL happen. Someday.

Wascopirate6 months ago

It's not a nasty, dirty, wet hole filled with ends of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing to sit down on or to eat: it's a hobbit hole, and that means comfort.

haha! so glad someone said that! it was on my mind the whole time!

it does look like a hobbit hole just needs a round door

girltaker6 months ago

this was the coolest thing ive ever biult

Owen,
If I'm trying to make this dome for my cousins do you think it would be big enough? Or would it be better if I just made a roundhouse or regular one. I have a lot of cousins and I want there to be enough room for all of them.
Owen Geiger (author)  bthorson1391 year ago
This dome is too small to live in. It's really just a tool shed or emergency storm shelter.

I suggest making roundhouses. See my Roundhouse Instructable. It's easy to make roundhouses large enough for your needs.
I knew that hobbits would eventually take over the world.
Terralive1 year ago
Hi everyone. Does anyone know ho big in diameter I can buid an earth dome with an normal size bag:
Owen Geiger (author)  Terralive1 year ago
Somewhere around 20' interior diameter is about the limit. That would be 23' exterior diameter.

The largest earthbag dome at this time is the Om Dome. It's 27' exterior diameter. They had problems and had to rebuild part of it. Don't risk doing a large dome like this unless you're experienced. The dome could collapse on you while you're building it.
http://www.earthbagbuilding.com/projects/omdome.htm
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