How to Build an Earthbag Dome

Step 14 Upper Courses of Earthbags

Continue the same process of laying and tamping bags. The corbel (overhang between courses) will increase the higher you go. Use the string lines at every course to arrive at the desired shape. Make sure each bag is angled toward the center point and tightly butted to the next bag. (This is what makes the dome really strong.)

The photo shows the view from above. You’ll get to a point where there’s almost nothing under your feet. It’s a strange sensation to say the least. Don’t step on the inner edge of the corbel or the bag could tilt loose. Be extra careful working higher on the dome. You’ll be working around barbed wire, tools laying on the wall, etc. Watch your step. Don’t get in a rush. Take lots of breaks and drink plenty of water.

The second photo shows the last bag being put in place with a great feeling of accomplishment. The last bag looks like a mushroom cap.