Constructing An Earth Bag Roundhouse

Earth Bag RoundhouseWe currently have two earth building projects in the works here at New Life. The first is an adobe hut with a living roof that we started building during the Winter Solstice Festival in December of last year, which is now very close to completion.

The second is a roundhouse made using an earth bag technique. The team is being led by New Life long-term volunteer and earth building specialist Richard Grinchis. We constructed our three adobe huts and forest hall using mud bricks, so earth bag building is a new technique that we’re experimenting with. It involves filling bags with an earth-clay mixture and arranging them in shape, before rendering and sealing the entire structure with adobe clay. The earth-clay mixture dries very hard and is extremely strong and durable. For this hut we chose a perfectly round shape.

Earth Bag RoundhouseOne advantage that earth bags have over mud bricks is that they’re much more time efficient than making mud bricks. With mud bricks, we need to cast them into moulds, wait for them to dry, and accumulate enough to start building. With earth bags, we can start building the house right away and the construction process goes much faster, although it is much more labour intensive, with lots of heavy lifting involved.

It’s hard to believe how quickly this hut has gone up, from choosing the site, laying the foundation, and commencing the construction of the earth bag walls in late March 2014. In order to build the walls, the bags are laid into place and then filled bit by bit with earth and clay from buckets.

Earth Bag RoundhouseDue to budgetary and other constraints, the team has had to make some improvisations during the construction process. For instance, typical earth bag building involves fortifying the structure by using barbed wire between each of the layers of earth bags. However, barbed wire was too expensive, so the team innovated by using metal pins to stabilise the bags when the wall reached 4 or 5 layers high.

Also, we didn’t have wooden ‘forms’, which act as placeholders for the windows. Therefore, the windows were marked out and then fortified with planks of strong teakwood as well as a ring of cement to stop them from caving in later. Once the walls are completed we’ll push the earth bags out and voila – windows! Similarly, the team lacked enough mud bricks to use as a form for the door, so they built up the door halfway, laid a plank across the middle, and then re-used the same bricks on top of the plank.

Earth Bag RoundhouseThe roof was originally going to be a really futuristic looking earth bag dome, but we decided that with the heavy monsoon rains we get here, it wasn’t going to be a viable option (erm, mudslide in your living room, anyone?) The roof will instead be a pitched roof, consisting of a metal framework and bamboo thatching.

The bathroom extends out from the house and is being built with mud bricks to accommodate for its slightly irregular shape. We’re only a couple of rows of earth bags away from completing the walls and are really excited about how the roundhouse is turning out. More updates coming soon so stay tuned.

SV

6 Comments

  1. Seasons greetings!
    I just came across this article while searching Google for Earthbag Roundhouse. We will be building one this coming spring in the Caribbean and have chosen a thatched roof vs a dome to protect against rains as well. I’m curious about your plaster- what kind of mix did you use? Has it held up to the rains well? I would love the recipe if you have one. Thanks in advance. Ursula

  2. Hi there, I cant wait to see the finished building, it looks great so far. I notice that you are using tubes rather than bags. Did you source these in Thailand? if so please can you send me the supplier details? thanks so much, best wishes, Janine

    1. Hi there Rizal, there were dozens of volunteers involved who came and went over the course of construction. It took not less than 6 months from laying the foundation to complete the building.

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