So, first off let me say I love the berm shed. I love everything about it - how it functions as a beautiful green screen and sound block, how it gives plenty of open-bay access on the storage side, and how it looks and feels all around.
What I'm fishing for here is a discussion about ways to make it a design that is achievable in as many different climates and zones as possible.
In properties without an abundance of straight trees, you could use milled lumber for roof decking. But that's a lot of money/time/energy resources, so I'm wondering what ideas people have for other possibilities for easy, abundant decking solutions that can stand the load of earth above. What are existing traditional methods for decking on an earth-sheltered structure that might be suitable for a berm shed style structure? Has Sepp used anything other than logs and stone in his earthen shelters?
Similarly, what other materials could serve for the walls? Stone is one obvious choice. Perhaps rammed earth, or tires (earthship style) though tires have their drawbacks.
One other design consideration - in wetter climates, you probably couldn't get away with posts in the ground, so they'd have to go on stone plinths or piers, or similar. Which is fine, except then you have all the racking and sheer forces to deal with. Is this just a simple matter of additional angle braces?
Let's get these ideas some traction in other climates!
The Berm Shed movie trailer is a great, quick reference for the basic idea of the existing berm shed.