How do you keep a high vertical earthbag wall that is straight from toppling over? This is always a concern when designing and building standard rectilinear buildings with earthbags. The conventional solution generally relies on periodic buttresses and/or heavy-duty reinforced concrete bond beams at the top of the wall.
I have come up with a simpler solution that is much easier to install, requires no concrete or buttresses, and also provides hurricane and earthquake protection for the walls and the roof framing. At the same time this method will automatically provide strong lintels over doors and windows.
The idea is that during construction, once you have arrived at the height where you are at the level of the top of any door or window (presuming that these are the same height), you lay down a piece of hollow, rectangular-section steel tubing right on top of that last row of earthbags. It is also possible to do this pieces of wood by using somewhat larger dimensions, but I prefer metal because it is stronger and more reliable in its characteristics. It should be as long as the wall is, going from the center of one corner to the center of the other corner. In most localities you can purchase such tubing up to 6 meters (20 feet) long, and two pieces can be strapped together if necessary, using connection plates that are either welded or bolted in place. This tubing can be various sizes, depending on how long the wall is, but I recommend about 1 1/2″ X 4″ in general.
For a complete description of this concept and step-by-step instructions for installation see earthbagbuilding.com.